Category: Viton ® (FKM Fluoroelastomer)

What Are The Differences Between Viton ® (FKM Fluoroelastomer) Rubber And Silicone Rubber?

I got into a recent debate with a group of maintenance engineers on what is the best rubber to use for our applications. The debate centered around whether we should be using silicone rubber in our facilities or should we be using Viton ® (FKM Fluoroelastomer) rubber.

As you might guess, there was no easy answer to the debate. We all have slightly different needs in our plants depending on what types of processes we are doing, what chemicals are present and our operating environments. In some cases, neither of these materials are ideal, but since we were only debating the two, let us stick to them for now.

Silicone rubber was favored by some of the maintenance engineers. Their biggest argument was about the crazy temperature ranges silicone rubber can be used in. It can withstand temperatures that range from -67 °F to 572 °F. There are almost no working conditions where that will not work.

Viton ® (FKM Fluoroelastomer) rubber on the other hand has an impressive temperature range of -15°F to +440°F and can go higher for short periods of time. It is the bottom number that concerned the silicone advocates. Cold winter temperatures for components being used outside can dip below -15 in northern states. Of course, does the equipment they are using the seals on sit outside?

The Viton ® (FKM Fluoroelastomer) rubber advocates argued against the softness of silicone rubber. They felt it was less durable than Viton ® (FKM Fluoroelastomer) in most applications. Viton ® (FKM Fluoroelastomer) is definitely a harder rubber than silicone.

The talk finally swung around to what is really important in many situations. Which is better for resistance to the materials they are going to be used around. Both rubbers are used for seals, o-rings and gaskets, but which one will stand up better to chemicals.

If we are talking about a simple cross-section, Viton ® (FKM Fluoroelastomer) rubber would be the winner. It has a high-resistance to a wide variety of solvents, oils, petroleum products, fuels, acids, animal fats and even vegetable oils. Silicone rubber on the other hand only has a moderate resistance to these same chemicals.

This is one area where we all agreed you had to start digging deep. You cannot randomly choose between silicone, Teflon™, Viton ® (FKM Fluoroelastomer) or other other formulations of rubber for your application. You need to dig into the actual chemicals they will come in contact with and determine their resistance to them. Viton ® (FKM Fluoroelastomer) is excellent to use in automotive, aerospace and other applications where it comes in contact with fuels, but can fail miserably with other chemicals.

As a good example of chemical resistance or failure, silicone receives a fair rating for use with ammonia. It can be used for seals in ammonia transfer hoses and containers. Viton ® (FKM Fluoroelastomer) on the other hand receives an unsatisfactory mark. Viton ® (FKM Fluoroelastomer) will fail quickly in environments with ammonia.

On the opposite side of the spectrum, using a silicone seal with automatic transmission fluid would be a disaster, but Viton ® (FKM Fluoroelastomer) rubber is considered an excellent choice with a top rating.

Hydraulic fluid is something all maintenance departments battle on a regular basis. Silicone seals will survive with normal hydraulic fluid but have a quick death with synthetics. Viton ® (FKM Fluoroelastomer) excels with regular fluid and can be used just as easily for synthetics.

Part of the debate between the two materials needs to come down to how you are going to use the materials. Silicone seals are usually molded to fit. Silicone is more prone to breakage and tearing compared to Viton ® (FKM Fluoroelastomer).

Viton ® (FKM Fluoroelastomer) rubber can be molded, but is also available in sheet form that can be used to cut gaskets and seals with machines or even be hand cut for custom seals.

Both silicone rubber and Viton ® (FKM Fluoroelastomer) offer good levels of fire resistance, so we felt that one was a draw in our debate.

What was our final conclusion as to which rubber was superior? We did not decide. We all recognize seals have to be chosen based upon the needs of a specific application. Most of us agreed that Viton ® (FKM Fluoroelastomer) rubber had a wider range of application for most of our purposes, but that silicone rubber still had its place. We carefully evaluate the type of rubber for a seal based upon the equipment manufacturers recommendations and chemical resistance charts that help us choose seals that are safe for our environment.

Understanding the Difference between Viton ® (FKM Fluoroelastomer) Rubber and EPDM Rubber

O-rings are widely popular in the manufacturing of different machines. One of the most common materials that are used in the making of O-rings is elastomers. There are two types of elastomers that exist in the market and both can be used to make the O-rings: one is the Viton ® (FKM Fluoroelastomer) sheets and the other is EPDM rubber.

These rubbers polymers are known for their ability to get compounded at a low compression set. So, they tighten to the surface against which they are pasted. Both these elastomers can be stretched and are flexible to a great extent. They don’t break and you will often see them used as gaskets for pressure cookers and for making pumps, valves, and similar other items. But even though they have such similarities, there are numerous differences between these two elastomers. On one hand, Viton ® (FKM Fluoroelastomer) rubber is considered as a fluoro elastomer, while on the other hand, EPDM is considered as ethylene-propylene-diene-monomer. Without further ado, let’s take a look at some of the main differences between these two rubber polymers:

Chemical Resistance

One of the biggest differences between Viton ® (FKM Fluoroelastomer) rubber and EPDM rubber is their chemical resistance. Viton ® (FKM Fluoroelastomer) rubber is resistant to some minerals and also edible oils like vegetable oil. In addition to these two items, this elastomer is also resistant to aromatic hydrocarbons, many alkalis, and gasoline.

EPDM rubber has poor resistance to some other items such as fuels, grease, and mineral oils. However, it is highly resistant to items like silicone oils, glycol based brake fluids, polar solvents like ketones, and hot water and steam.

There are some common items that both these polymers have good resistance to such as weather conditions, ozone, and oxygen.

Temperature Conditions

Temperature is another factor that helps to understand the difference between these two elastomers. The temperature resistance of Viton ® (FKM Fluoroelastomer) rubber ranges from -20°C to 210°C. That is why it is mostly used for items that require a high temperature resistance. On the other hand, EPDM rubber has a temperature resistance that ranges from -45°C to 145°C. Although both the elastomers are widely used for items that need a high temperature resistance, EPDM rubber has a slight advantage over Viton ® (FKM Fluoroelastomer) rubber when it comes to working low temperature conditions. However, Viton ® (FKM Fluoroelastomer) rubber has an upper hand on EPDM rubber when the temperature condition required is more than 145°C.

Cost of the Elastomers

Now that you have an idea of the characteristics of the two elastomers, you would want to know what their price is and if they are readily available in the market. Yes, both EPDM rubber and Viton ® (FKM Fluoroelastomer) rubber are available. But Viton ® (FKM Fluoroelastomer) rubber is comparatively much more expensive than EPDM rubber. In fact, the former is almost eight times more expensive than what EPDM generally costs. However, there is one advantage that Vitron rubber will provide even if they are expensive. You will get them in a variety of sizes. Different machines may require different O-rings and if you are looking for a range of sizes, then Vitron rubber should be your first choice. EPDM rubber may be less expensive than Vitron but they are not available in such a wide range of sizes.

Applications of the Elastomers

Many people think that since both these elastomers are used in O-rings, they are similar in nature. But in reality, they are not. Since Viton ® (FKM Fluoroelastomer) polymer has a high chemical and oil resistance, it is widely used in chemical, food, and the petrochemical industries. These Vitron polymers consist of nitrile O-rings that are used in the industries mentioned above.

EPDM has a moderate chemical resistance and that is why it works best where steam applications are required. This rubber polymer is not used in industries that deal with petroleum solvents and agents.

So, if you are in a dilemma to choose between Vitron rubber and EPDM rubber, it will be best to understand their compatibility of the respective fluid that they are going to work in the required application. The temperature conditions along with the chemical resistance of the item will come into play when you decide between these two rubbers. Make sure you go through the details given above before choosing one for your project.

How Can You Determine If You Should Use Gortex or Viton ® (FKM Fluoroelastomer) Rubber?

Gortex, also known as Gore-Tex Sealant, has been capturing a piece of the sealant market. How is it different from a Viton ® (FKM Fluoroelastomer) rubber sheet sealant? And which is better to use?

First we need to discuss what Gore-Tex sealant is. It is a PTFE fluorocarbon material, but it is very different from other rubbers made from PTFE. Gore-Tex sealant is very strong, but its appearance is very deceiving. It has a very soft spongy appearance. Gore-tex seals can come in a seal ready to be installed, or can come as a continuous cord that you use to form your own seal.

One of the biggest advantages of the Gortex seal is the softness. It can be used in areas with uneven edges where most seal materials will fail. Viton ® (FKM Fluoroelastomer) rubber is a much stiffer material and should be used to seal two prepared and even surfaces.

The softness allows the material to be used with more fragile materials, also. Softer plastics and glass can be sealed with Gore-Tex and not be shattered due to the cushioning effect of the softer sealant.

Being soft is not always the right solution. Gore-tex cannot as easily be formed into sheets for seals and gaskets, which is an area where Viton ® (FKM Fluoroelastomer) rubber excels. The softness does not provide an advantage in most common sealing situations either. If you are sealing two well fitting parts, Viton ® (FKM Fluoroelastomer) Rubber can provide a tight seal with more durability than Gore-Tex.

The temperature range of Gore-Tex is almost unimaginable. It can be used in applications down to an astounding -269°C and up to an equally impressive 315°C. This gives it one of the highest temperature ranges of common sealing materials. Viton ® (FKM Fluoroelastomer) Rubber provides a temperature range of -26°C to 230°C, which satisfies the needs for most applications but falls far short of the range of Gore-Tex.

Both Gore-Tex and Viton ® (FKM Fluoroelastomer) Rubber are used in a variety of applications involving chemical processing. Viton ® (FKM Fluoroelastomer) is outstanding when dealing with petroleum products, hydraulic fluids, vegetable oils and a wide variety of other chemicals. Gore-Tex is commonly used with acids, alkali and solvents.

There are many crossover applications between the two materials, but most commonly Viton ® (FKM Fluoroelastomer) Rubber will be the most cost effective choice when it can be used.

Many PTFE and ePTFE materials, like Gortex, are known to have problems with creep and cold-flow. What this means is they can move even while cold. The creeping means the entire seal may move out of position over time. Cold-flow means the seal may ooze out into the pipe, or outside, slightly. This can cause slight restrictions in material movement through the pipes. Some Gore-Tex materials are now designed to reduce both creep and cold flow.

Viton ® (FKM Fluoroelastomer) rubber does not have any issues with either creep or cold-flow. It is a material with more resilience and will stay in-place as applied throughout its life.

Both Gortex and Viton ® (FKM Fluoroelastomer) rubber have important places within the sealant industry. You are probably starting to see where they have some crossover in application, but they also have more differences than many sealing material competitors.

When you need to seal irregular or fragile flanges, Gore-Tex PTFE is superior to Viton ® (FKM Fluoroelastomer) rubber. Viton ® (FKM Fluoroelastomer) rubber is superior in applications where a strong seal is needed between two smooth, or regularly shaped, items.

Gore-Tex provides a temperature range that Viton ® (FKM Fluoroelastomer) rubber cannot match, but within its temperature range Viton ® (FKM Fluoroelastomer) Rubber can provide a more durable and secure seal than Gore-Tex.

One of the other big differences is in chemical resistance. Gore-Tex’s PTFE formula has a wider range of use than Viton ® (FKM Fluoroelastomer) rubber, but with the added cost. Viton ® (FKM Fluoroelastomer) rubber has become a top choice in the automotive and aeronatuics industries for its excellent chemical resistance paired with reasonable cost. Viton ® (FKM Fluoroelastomer) is resistant to mold, mildew, fungus and other items which are commonly battled in both industries.

Are these two materials direct competitors? In some situations they can be, but due to their differences in strength, softness and pricing it is usually an easy decision for engineers to make. Evaluate your needs carefully when comparing the two materials. If you need the extreme capabilities of Gore-Tex then it is one of your few choices, but if you need a great balance of capability and price, Viton ® (FKM Fluoroelastomer) Rubber could be the answer.

What Are The Important Differences Between Buna Rubber and Viton ® (FKM Fluoroelastomer) Rubber?

When it comes to seal materials, Buna Rubber and Viton ® (FKM Fluoroelastomer) gaskets are two of the heavyweight contenders. These two rubber formulations are in a constant battle for the top spot, so what are the important differences between the two?

Both Buna Rubber and Viton ® (FKM Fluoroelastomer) are used extensively in pumping applications, so we will start by using that as our comparison point.

Buna Rubber (Butadiene Acrylonitrile) and Viton ® (FKM Fluoroelastomer) (A Dupont Synthetic rubber and Fluoropolymer Elastomer) are both superior over natural rubber seals in resisting heat aging.

Buna has a moderate temperature resistance with a -30°F to 250°F range of operation. This still gives it a much higher range than natural rubber, but does not allow it to be used in high temperature situations.

Viton ® (FKM Fluoroelastomer) has a higher temperature range, but falls short of Buna on lower temperatures. Viton ® (FKM Fluoroelastomer) can resist temperatures of 5°F to 400°F and can even withstand temperatures up to 600°F for up to 48 hours. If you are pumping high temperature fluids, or operating in high temperatures, Viton ® (FKM Fluoroelastomer) wins the battle.

Buna wins the battle if you are working in cold environments. The -30°F allows it to be used in outdoor pumps in frigid environments where Viton ® (FKM Fluoroelastomer) would become to inflexible to maintain a secure seal.

Will your seals be subject to sunlight? This is another area where Viton ® (FKM Fluoroelastomer) rubber steps to the forefront. Its resistance to UV rays makes it ideal for outdoor applications.

One of the key things to consider is resistance to chemicals the seals may come in contact with. Buna provides excellent oil resistance and good resistance to many solvents. Viton ® (FKM Fluoroelastomer) rubber provides excellent resistance to oil, fuels, solvents and many other chemicals.

How can you tell which seal is currently being used in your situation? Buna Rubber is normally black in color, while Viton ® (FKM Fluoroelastomer) rubber tends to be brown. You can also check the manufacturers specifications and parts lists to determine which type of seal they recommend.

What are some of the other physical differences between the two rubbers?

Buna rubber has more elasticity than Viton ® (FKM Fluoroelastomer) rubber. Buna rubber can be stretched up to a 600% elongation. This is double the amount of elongation of Viton ® (FKM Fluoroelastomer) rubber at 300%. You need to stop and consider if this is a benefit in your situation or not. Many seals are never stretched during application and usually only in small amounts when they are.

After seeing the elongation comparison, you probably will not be surprised to learn that Buna rubber is softer with a Shore A Durometer range of 20 to 95, while Viton ® (FKM Fluoroelastomer) rubber ranges from 60 to 90.

Another difference can be found in the tensile strength of the two rubbers. Buna rubber is rated with a 200-3000 psi tensile range, while Viton ® (FKM Fluoroelastomer) rubber is rated with a 500-2000 psi tensile range.

Viton ® (FKM Fluoroelastomer) rubber separates itself from Buna rubber with its added resistance to oxidation, UV rays, weather, fungus and mold growth.

While both seals can be used in a wide variety of applications, Buna is normally not used in either the food or pharmaceutical industries. Viton ® (FKM Fluoroelastomer) is used in industry, food, pharmaceuticals and a wide range of other industries.

How are you supposed to decide between the two materials?

You always need to start with your personal application. What chemicals will the seals encounter? What are the temperature ranges you expect? Will the seals be used outdoors? Is elongation important in your situation?

Both Buna and Viton ® (FKM Fluoroelastomer) make excellent seals, but you must determine what is ideal for your situation. As an example, while both seal materials work great at 200 degrees, which one works better? At that temperature Viton ® (FKM Fluoroelastomer) rubber wins the battle. It can be used indefinitely at that temperature. What happens if you drop a few degrees to around 170? Then Buna rubber becomes slightly superior, but not by much.

Start off by making sure the seal will work with any chemicals you are using. Then verify your temperature ranges. Once you know those two factors you can make a good decision between Buna Rubber or Viton ® (FKM Fluoroelastomer) Rubber. Viton ® (FKM Fluoroelastomer) is usually considered the more flexible option, but only you can decide what is right for you. Evaluate the difference, compare the costs and then you can order with confidence.

Comparative Difference between Viton ® (FKM Fluoroelastomer) Rubber and Neoprene Rubber

Many people think that Viton ® (FKM Fluoroelastomer) and neopropene are the same because several of their properties match but there are many reasons why you should consider them to be different.The mix up generally occurs with the fact they are are two of the most commonly approved elastomers. But, they are not the same thing.

These rubbers are mostly known for industrial uses. Their versatility and compression set resistance along with other properties have made them crucial for many industries. Their characteristics, applications, and properties are different from each other. Here are some of the differences discussed below:

Difference in Withstanding Extreme Temperature

Different rubbers react to different temperature conditions and accordingly, they are used in various industries. Viton ® (FKM Fluoroelastomer) rubber or Viton ® (FKM Fluoroelastomer) seals have the ability to withstand temperature between -20°C to 210°C. It has already been tried and tested by industries that involve high-temperature jobs and Viton ® (FKM Fluoroelastomer) rubber is perfect for them. However, it will be better to not use Viton ® (FKM Fluoroelastomer) rubber under -15°C in dynamic conditions as they may fail to react. They become quite hard and inflexible as the temperature goes down.

Neoprene rubber, on the other hand, is very effective between -30°C to 100°C. Although its highest temperature is quite low compared to Viton ® (FKM Fluoroelastomer) rubber, they are very effective for low-temperature conditions. They do not become inflexible or hard even when they reach a very low temperature.

General Utility

Both these rubbers are used in different industries because of their temperature withstanding conditions. Viton ® (FKM Fluoroelastomer) rubber has been extensively used for diverse sealing jobs. Most of the sealing agents work on very high temperature and need excellent chemical resistance. Viton ® (FKM Fluoroelastomer) rubber has all those qualities which is why they can be easily used with petroleum oils, silicone fluids, acids, and gases, aromatic hydrocarbons, and halogenated hydrocarbons.

In the case of neoprene rubber, the use is mainly for general purposes such that require low resistance such as petroleum oil, hydraulic fluids, water, and aliphatic hydrocarbons. Researchers are trying to use this rubber in areas that demand a low temperature.

Environmental Properties

This is another factor that clearly distinguishes neoprene rubber from Viton ® (FKM Fluoroelastomer) rubber. Viton ® (FKM Fluoroelastomer) rubber and Viton ® (FKM Fluoroelastomer) seals are generally resistant to a lot of chemicals like oil, fuel, acids, and minerals. They are also very effective in resisting UV exposure, oxidation, ozone, fungus, mold, and extreme weather conditions. This makes Viton ® (FKM Fluoroelastomer) superior to neoprene rubber. Their high temperature-resistant property has made them the best ingredient to resist any kind of moist oil or lubricant and many lubricant-based products.

Neoprene rubber is also known to resist lubricants and oils. That is one common characteristic that neoprene rubber has with Viton ® (FKM Fluoroelastomer). These can also resist petroleum-based lubricants but the seals have different benefits than Viton ® (FKM Fluoroelastomer) rubber. The neoprene rubber seals provide tear resistance functions and are used for superior abrasion. This helps them to be used for various heavy duty industrial applications.

Cost Involved

The cost of both these rubbers is different because of their properties and industrial applications. Neoprene rubber is a more cost-effective solution and works well with chemical resistance and constrained temperatures. However, Viton ® (FKM Fluoroelastomer) rubber is a comparatively expensive choice. They are almost ten to fifteen times more expensive than neoprene rubber. This is because of their crucial properties and the involvement in various industries. Their applications have made them firm favorites in the industries that require high chemical and oil resistance.

Neoprene has several compounds that are also used in industries. These compounds are generally flame resistant and do not support combustion. The compounds of neoprene are almost similar to natural rubber when kept at room temperature. However, when they are used at elevated temperatures, the tear resistance capability becomes very poor but it can be improved significantly by compounding with several reinforcing materials.

One of the reasons why researchers are trying to make the most of neoprene rubber is that it offers very good abrasion and resilience strength. Moreover, the adhesive capabilities of this rubber to fabrics and metals are also quite good. Since neoprene rubber does not work well at high temperatures, they can be used for various purposes where the adhesive properties are more important than the oil resistant properties. As for Viton ® (FKM Fluoroelastomer) rubber, it has already made a huge mark in the industries and they will continue to rule in the years to come.

What Are The Differences Between Teflon™ and Viton ® (FKM Fluoroelastomer) Rubber?

You have probably seen both Teflon™ and Viton ® (FKM Fluoroelastomer) rubber mentioned when looking at o-rings and gaskets. They are both considered premium materials to be used in seals, so what are the differences? Let us start by taking a look at their composition.

Both materials are fluorinated to improve chemical resistance. Viton ® (FKM Fluoroelastomer) gasket material is a partially fluorinated elastomer, while Teflon™ is a synthetic fluoropolymer of tetrafluoroethylene. What does that mean? They use different chemical formulas to make materials with similar, but different applications.

Let us examine some of the differences.

Viton ® (FKM Fluoroelastomer) rubber is designed to withstand temperatures that range from -15 degrees Fahrenheit up to 437 degrees. It can withstand temperatures up to 600 degrees for limited amounts of time.

Teflon™ has a wider range of temperature usage. It can withstand temperatures down to -250 degrees Fahrenheit and up to 450 degrees. The top end temperature difference is nearly the same, but the low end temperatures make Teflon™ more suitable for extreme cold applications.

Teflon™ has an extremely low coefficient of friction. In layman’s terms, it is slippery. Teflon™ also has good wear resistance.

Viton ® (FKM Fluoroelastomer) Rubber does not have the low coefficient of friction like Teflon™, but is equal or superior in wear resistance. It is considered superior in compression set resistance, resilience, and permeation resistance. What does all of that mean? It means it bounces back into shape more consistently, it stands up to wear well, and prevents chemical from soaking into it.

Where are the two materials commonly used?

Both materials are used in o-rings, gaskets, and seals, but where they get used is what separates the materials.

Viton ® (FKM Fluoroelastomer) Rubber is used for vacuum seals, in applications with acids, lubricants, petroleum fuels and oils, silicone oils, and with many varieties of chemicals.

Teflon™ is used in applications which need chemical resistance, fuel resistance, and a low coefficient of friction.

As you are starting to see, there is a lot of crossover between the two materials in applications, but cost is often the determining factor. Viton ® (FKM Fluoroelastomer) rubber is less expensive than Teflon™ making it the preferred choice when it can be used. But, let us continue examining the differences a little more.

Viton ® (FKM Fluoroelastomer) Rubber cannot be used for certain chemicals. A few examples include ketones, brake fluids, ammonia, acetone, or low molecular ethers. It is not recommended for use in hot water and steam applications, unless you choose specially formulated versions of Viton ® (FKM Fluoroelastomer) made for those purposes.

Teflon™ fails when it comes to working on equipment which might have burrs or need to be stretched to fit. Teflon™ o-rings and seals tear or break more easily in these situations.

What are some common applications for both types of seals? This is a great way to compare the materials in real life.

Viton ® (FKM Fluoroelastomer) Rubber is used for seals in the chemical processing industry. The aerospace industry relies on Viton ® (FKM Fluoroelastomer) seals in a variety of applications including in fuel delivery systems. The oil and gas industry use Viton ® (FKM Fluoroelastomer) seals extensively. One of the largest uses of Viton ® (FKM Fluoroelastomer) rubber is the automotive industry where fuel and oil systems rely on o-rings and seals made from Viton ® (FKM Fluoroelastomer).

Teflon™ seals are found extensively in the chemical processing industry, also. You will find them in chemical storage seals and gaskets in handling equipment.

How do you determine what is the best choice for your seals?

That is not always easy to determine. Teflon™ and Viton ® (FKM Fluoroelastomer) Rubber seals can often be used interchangeably in many industries. Viton ® (FKM Fluoroelastomer) wins in many of these applications due to its lower cost. Teflon™ is superior resistance to low temperatures and ability to resist a higher range of chemicals helps it keep a good market share in the industry, also.

When determining your needs, first evaluate the temperature guidelines. If you are running in a refrigerated environment look at Teflon™ as the preferred choice. Next compare the chemical resistance needs for your seals. If Viton ® (FKM Fluoroelastomer) meets both your temperature and chemcial resistance needs it will be the better choice. It is easier to work with, lower in cost, and is less prone to breakage due to stretching or nicks in the material.

Both Teflon™ and Viton ® (FKM Fluoroelastomer) are high-quality materials which have cemented their places in industry. While there are many similarities between the two materials, their differences are what will help you decide which is right for you.

The Standout Benefits Of Viton ® (FKM Fluoroelastomer) Rubber

Viton ® (FKM Fluoroelastomer) is the brand name for a fluoropolymer elastomer and synthetic rubber that is used commonly in O-rings, along with other extruded or molded products. This category of elastomers is made up of Copolymers of Terpolymers of TFE (Tetrafluoroethylene), HFP (Hexafluoropropylene), and VF2 or VDF (Vinylidene Fluoride), along with PMVE (Perfluoromethylvinylether) that contains specialty polymer.

DuPont was the first company that marketed this category of materials, which is why Viton ® (FKM Fluoroelastomer) became the more common name associated with the fluoropolymer family. Viton ® (FKM Fluoroelastomer) polymers are made up of 4 families, while the fluorine-content of the more popular Viton ® (FKM Fluoroelastomer) grades typically varies between 66% and 70%. The primary grades are A (Dipolymers of VF2/HFP) that has a 66% fluorine content, B (Terpolymers of VF2/HFP/TFE) that is used more commonly for gaskets or seals, with a fluorine content of 68%, F (Terpolymers of VF2/HFP/TFE) used in automotive fuels that are oxygenated with a 70% fluorine content, and the specialty types which include Viton ® (FKM Fluoroelastomer) Extreme, GFLT, GBLT and GLT which are commonly used in oil exploration and various types of automotive applications.

Benefits Of Viton ® (FKM Fluoroelastomer)

When comparing Viton ® (FKM Fluoroelastomer) to many of the other elastomers, it can withstand higher temperatures better while at the same time maintaining its mechanical properties. Chemical and oil resistance also are unaffected by the elevated temperatures. The compounds found in Viton ® (FKM Fluoroelastomer) stay elastic when they are exposed to “laboratory” air-oven at exposures that are intermittent up to 315°C or aged up to 204°C. The Viton ® (FKM Fluoroelastomer) grades are also able to resist degradation from various fluids and chemicals, these include lubricants, fuels, oils along with many of the mineral acids more than any of the other types of non-fluorinated elastomers.

To put this is in simple terms, this means Viton ® (FKM Fluoroelastomer) offers superior fluid resistance out of all the commercial rubbers. With such a low permeability associated with so many substances, Viton ® (FKM Fluoroelastomer) delivers performance that is exceptionally good in the oxygenated-automotive fuels. However, rugged characteristics of Viton ® (FKM Fluoroelastomer) do not stop there. Due to the fact that they also offer great resistance when it comes to compression, even when exposed to the temperatures which make other types of non-fluorinated elastomers very brittle.

Viton ® (FKM Fluoroelastomer) is also very resistant when it comes to climatic conditions, atmospheric oxidation, mold and fungus. In addition, Viton ® (FKM Fluoroelastomer) offers great electrical properties in the low frequency and low voltage applications, along with lower burning characteristics.

Broad Chemical Compatibility

Viton ® (FKM Fluoroelastomer) and the materials that make up this product are compatible when it comes to a variety of chemicals. Some of these include:

– Hydraulic oil

– Fuel and lubricating oils

– Gasoline (high octane)

– Vegetable oils

– Kerosene

– Diluted acids

– Alcohols

A comparison between capabilities becomes important when considering changes in materials in order to accommodate operating conditions that are more severe or to increase reliability and production.

Temperature Stability

There are a variety of applications that require the rubber parts that are able to withstand stress from temperature excursions that are accidental, along with an increase in operating temperatures that allows for production increases. In some cases, Viton ® (FKM Fluoroelastomer) can continuously perform at 204°C, as well as at short excursions of temperatures up to 315°C. Some Viton ® (FKM Fluoroelastomer) rubber grades are also able to perform just as well in the temperatures that drop to -40°C.

FDA Compliant

When FDA compliance becomes necessary, there are specific Viton ® (FKM Fluoroelastomer) material types that match up to the FDA requirements for pharmaceutical and food applications.

Matches Stringent Environmental Regulations

As the environmental regulations continue to up stakes against leaks, spills and emissions, the Viton ® (FKM Fluoroelastomer) high-performance seals have managed to fill in the gaps when most of the other types of elastomers have fallen short.

Viton ® (FKM Fluoroelastomer) Rubber Uses

Viton ® (FKM Fluoroelastomer) is a highly durable material mainly used for seals, gaskets and O-rings. Viton ® (FKM Fluoroelastomer) tubing is commonly used for transportation and automotive fuel applications that involve biodiesel in high concentrations. Types F, which includes FKM-GF-S and FKM-GBL-S and Type B are more resistant when it comes to acidic biodiesel as this fuel type is oxidizing and unstable.

There are a variety of Viton ® (FKM Fluoroelastomer) grades, which is why it is very important to gain an understanding of requirements for an application to ensure the correct grade has been used.

You can buy Viton ® (FKM Fluoroelastomer) sheets at our store

The Uses Of Viton ® (FKM Fluoroelastomer) Rubber

The rubber products that are produced that use natural rubber like India rubber derived from Rubber trees are made up of organic-compound isoprene-polymers, along with water in addition to other organics that exhibit mechanical properties that are good. However, natural rubber is associated with restricted petroleum product and thermal permanence compatibility.

The synthetic rubbers are elastomers or polymers that are produced from the synthesized petroleum products. These products are typically produced with the use of either an isoprene/isobutylene combination or chloroprene. In most cases the synthetic rubbers display increased chemical and mechanical properties along with endurances.

Viton ® (FKM Fluoroelastomer) Rubber

Viton ® (FKM Fluoroelastomer) of fluorocarbon (floronated hydrocarbon) is a rubber product that is trademarked and produced by DuPont Performance Elastomers). Viton ® (FKM Fluoroelastomer) is a reference to all the DuPont fluoro-rubber types generally sold as a Viton ® (FKM Fluoroelastomer) gasket sheet. The different fluoroelastomer types possess differing swell behaviors along with their compression/processing set resistance. For this reason, the manufacturers produce fluoroelastomer compounds that are appropriate in order to match up to required applications.

Viton ® (FKM Fluoroelastomer) features a maximum temperature-resistance of 204°C, without sacrificing on the life-span of the actual materials. The Fluoroelastomers typically decompose when exposed to higher temperatures and when they are exposed to heat such as fire they may also release hydrogen fluoride residues that are hazardous.

Viton ® (FKM Fluoroelastomer) is not able to maintain its acceptable performance and flexibility in the fixed application where the temperature falls below “26°C. However, in certain applications Viton ® (FKM Fluoroelastomer) is still able to perform in “40°C temperatures and “15°C to “18°C in specific types of dynamic situations.

Some of the fluorocarbon compounds show an enhanced resistance to acids, temperature extremes, ozone, water, steam and fuels. Viton ® (FKM Fluoroelastomer) is also highly resistance when it comes to:

– Sunlight and oxygen

– Compression

– Phosphate esters, oils, grease, vegetable oil, silicone, and minerals

– Salt solution

– Aromatic hydrocarbons such as toluene and benzene, aliphatic hydrocarbons such as natural gas, propane and butane

– Inflammable hydraulic fuels

– Methanol fuels and chlorinated hydrocarbons

Viton ® (FKM Fluoroelastomer) doesn’t resist ketones and acetones very well. Viton ® (FKM Fluoroelastomer) is also not very compatible with alkalis and ammonia gas-amines, glycol-based brake-fluids, acetic and fomic acids and superheated steam.

Viton ® (FKM Fluoroelastomer) Uses

The Viton ® (FKM Fluoroelastomer) Rubber products offer an array of uses without compromise. These types of elastomers are used more commonly as a gasket material like the ones that seal pumps, valves, leaks, etc.

The Viton ® (FKM Fluoroelastomer) O-rings has for many years been in use for SCUBU diving gear, particularly for the divers that use Nitrox gases, because the Viton ® (FKM Fluoroelastomer) materials are less likely to cause ignition from an oxygen content that is increased in Nitrox. Decay caused from an oxygen content that is increased is also a lot less.

Automotive along with other types of transport-fuel application that are subjected to high concentrations of biodiesel recommend tubing and hoses that are Viton ® (FKM Fluoroelastomer)-lined. Buna and Viton ® (FKM Fluoroelastomer) are elastomers that are the most commonly-used when it comes to automotive sealing.

The Viton ® (FKM Fluoroelastomer) O-rings offers functional characteristics that are similar and provide higher chemical and temperature resistance when compared to the Buna-N seals in engine timing-units in automobiles. Even though the performances of the Viton ® (FKM Fluoroelastomer) O-rings vary significantly, they are all highly compatible with the hydrocarbons.

When Are Viton ® (FKM Fluoroelastomer) Fluoroelastomers Used

When it comes to many automotive applications, Viton ® (FKM Fluoroelastomer) has gone onto establish the latest performance standard when it comes to the most current engine and fuel systems. Viton ® (FKM Fluoroelastomer) offers an improvement in system durability when it comes to extreme temperatures associated with acid condensates, transmission fluids, oils and fuels.

In tough gas and oil down-hole applications, Viton ® (FKM Fluoroelastomer) often assists in extending maintenance intervals along with helping to guard against the failure of seals. Viton ® (FKM Fluoroelastomer) also offers sealing when it comes to extremely high temps in the aggressive fluids used in jet engines. This ensures reliability which serves continuously at temperatures of 204°C.

Heat-resistant properties of Viton ® (FKM Fluoroelastomer) outlast the nitrile rubbers along with other types of general-purpose elastomers. The reliability of this product allows for an extension in service intervals, along with helping to extend maintenance budgets in the way of lowering unscheduled downtime, which includes a number of industries that include:

– Automotive

– Aerospace and aircraft

– Chemical transportation and processing

– Petroleum transportation and refining

– Gas and oil production and exploration

The primary uses of Viton ® (FKM Fluoroelastomer) include caulks, bonded seals, vibration dampeners, coatings, radial-lip seals, expansion joints, O-rings, gaskets, stock sheet and rods, and customized shapes.

What Are Viton ® (FKM Fluoroelastomer) Gaskets and Should You Be Using Them?

Viton ® (FKM Fluoroelastomer) Gaskets are simply gaskets made from DuPont trademarked fluoroelastomer. Now, let us get down to why that is important to you.

Viton ® (FKM Fluoroelastomer) rubber is formulated for the intense situations gaskets encounter. Gaskets in many applications must stand up to high heats, chemicals and pressure. The compound Dupont created can withstand heats up to 400 degrees Fahrenheit for indefinite periods of time and can with stand temperatures to 600 degrees for up to 48 hours. This high temperature resistance makes Viton ® (FKM Fluoroelastomer) Gaskets more durable than Buna gaskets for high heat situations.

Tensile strength is another place where Viton ® (FKM Fluoroelastomer) rubber shines for gaskets. It has an incredible 1000 PSI tensile strength. It will stand up to extreme pressures where other gasket materials fail.

Viton ® (FKM Fluoroelastomer) comes in different grades for different applications. Here is a brief synopsis of the different grades and their common uses:

Viton ® (FKM Fluoroelastomer) A – This is the most common Viton ® (FKM Fluoroelastomer) grade in use. It is considered the commercial grade material which is used for general purposes in the automotive industry, the fuel industry, and in aerospace.

Viton ® (FKM Fluoroelastomer) B – This grade is used by the electrical industries and chemical processing industries.

Viton ® (FKM Fluoroelastomer) F – This grade was formulated to be more resistant to automotive fuels, water, steam, and inorganic acids.

Viton ® (FKM Fluoroelastomer) Extreme – Dupont created this formula to provide the highest resistance to harsh chemicals. It is used for gaskets and seals in the oil field industry, for automotive fuel applications, and for aerospace fuel seals.

One of the features you would rarely think about when looking at gaskets is mold and fungus resistance. Rubber seals can become infected with mold and fungus which quickly deteriorates their capability. The mold and fungus can then move into your fuels, hydraulic fluid, or other areas of your equipment causing damage. Viton ® (FKM Fluoroelastomer) Rubber is resistant to mold and fungus growth.

Viton ® (FKM Fluoroelastomer) rubber is flexible in usage, too. It can be extruded to produce O-rings and other extruded gaskets, or produced in sheets for punched gaskets and seals. Viton ® (FKM Fluoroelastomer) gaskets are manufactured using a wide variety of methods, also. You can use die cutting equipment to punch out thousands of gaskets per hour, or hand cut gaskets for one-off applications. It works superbly with waterjet cutting equipment and flash cutting equipment, too.

Where are Viton ® (FKM Fluoroelastomer) gaskets used? Let us take a quick look at some of their applications in the automotive industry.

Fuel Tanks – Viton ® (FKM Fluoroelastomer) is used to make the gaskets, seals, and hoses in fuel tanks. It is resistant to gasoline, diesel, and blended fuels. Viton ® (FKM Fluoroelastomer) will not swell or become soft when used in direct contact with fuel.

Fuel Injectors – Fuel injector seals are made with Viton ® (FKM Fluoroelastomer) to make sure they do not degrade from fuel, or the heat from being mounted on the engine.

Emmission Control Devices – Talk about a harsh environment. Emission control devices get hot. Hot waste gases rush through the devices and the gaskets must make sure no gases escape. Viton ® (FKM Fluoroelastomer) rubber can resist both the heat and fuel waste.

Air Intake Manifolds – Your manifolds will feel the heat during long trips and hot summer days. Viton ® (FKM Fluoroelastomer) gaskets make sure the seals stay tight to keep your engine running smooth.

One area we have not mentioned is low temperatures. Dupont has formulated some of their Viton ® (FKM Fluoroelastomer) materials to be able to withstand low temperature situations, too. Why is this important? Ask the people living in Canada, Alaska and other northern places.

Your gaskets needs to remain flexible and tight whether your engine is cooking at running temperatures or is dead cold on a sub-zero morning. Those tight seals keep water out of lines and make sure air flow happens properly at any temperature.

The same situations you find in the automotive world are present in machines in factories, in the aerospace industry, and other heavy industries. Viton ® (FKM Fluoroelastomer) gaskets can stand up to the rigors needed in almost any situation.

The flexibility of Viton ® (FKM Fluoroelastomer) rubber makes it the first choice for gaskets in any harsh or critical application. When you need to replace gaskets, ask if the new gaskets are made from Viton ® (FKM Fluoroelastomer). Even if you pay slightly more for Viton ® (FKM Fluoroelastomer) gaskets today, you will save money with their improved performance and longevity.

Buy Viton ® (FKM Fluoroelastomer) here

Facts You Need To Know About Viton ® (FKM Fluoroelastomer) Rubber

Natural rubber is a product of an organic extract obtained from rubber trees. The rubber gets its mechanical properties from its natural composition of water, isoprene compounds and a host of other organic compounds. It is however worth noting that this natural product is generally not compatible with petroleum products and comes with a limited level of thermal permanence. This is where the need for synthetic rubber, Viton ® (FKM Fluoroelastomer) rubber in this case, comes in.

Synthetic rubber is an elastomer, or polymer, obtained from the synthesis of petroleum products. To give them their enhanced mechanical and chemical properties, synthetic rubber products are produced with using Isoprene, Isobutylene-isoprene mix or chloroprene. These synthetic rubber products are able to better meet the requirements of the most demanding applications.

What Is Viton ® (FKM Fluoroelastomer) Rubber?

The term Viton ® (FKM Fluoroelastomer) is a trademarked name used to refer to all types of fluorocarbon (floronated hydrocarbon) synthetic rubber polymers produced by DuPont Performance Elastomers. In simpler terms, each and every type of floro-rubber polymer produced by the manufacturer is referred to as Viton ® (FKM Fluoroelastomer).

The manufacturer produces a variety of floroelastomers to suit different applications, bacause each floroelastomer comes with a different compression/processing set resistance and unique swell patterns.

There are four main families of Viton ® (FKM Fluoroelastomer) polymers, as determined by their fluorine composition. Grade A polymers have a 66 percent fluorine content. Grade B polymers have a 68 percent fluorine content; and are mainly used in the manufacture of seals and gaskets. Grade F polymers have a 70 percent fluorine content; and are mainly used in applications involving exposure to oxygenated automotive fuels. The last category relates to specialty polymers, such as Viton ® (FKM Fluoroelastomer) Extreme, GFLT and GLT among others; these are mainly used in oil exploration and automotive applications.

General Properties Of Viton ® (FKM Fluoroelastomer)

As you can see from the above, Viton ® (FKM Fluoroelastomer) polymers come in a wide variety to ensure that they perfectly suit the requirements of each intended application. Here’s a general breakdown of the main mechanical properties of Viton ® (FKM Fluoroelastomer) polymers. These are responsible for their reliable and effective use in highly demanding applications.

Resistance To Temperature Extremes

The highest temperature rating for Viton ® (FKM Fluoroelastomer) polymers, without sacrificing the durability of the material is 204 degrees Centigrade (or 400 degrees Fahrenheit). The synthetic rubber compounds are known to undergo decomposition when exposed to high temperatures. They release a hydrogen fluoride residue when exposed to fire.

In some dynamic situations, Viton ® (FKM Fluoroelastomer) rubber can be used reliably and effectively in temperatures between -5 and 0 degrees Fahrenheit; as well around -40 degrees Fahrenheit in some applications. Generally however, these products lose their flexibility when used, below temperatures of -15 degrees Fahrenheit in fixed applications.

Viton ® (FKM Fluoroelastomer) Rubber Is Also Highly Resistant To The Following Substances

In addition to showing enhanced resistance to water, acids, steam, fuels and temperature extremes, Viton ® (FKM Fluoroelastomer) also demonstrates enhanced resistance to a variety of other substances including sunlight, oxygen, hydraulic fluids, salt solution, compression, chlorinated hydrocarbons, vegetable and silicon oil and grease, minerals, aromatic and aliphatic hydrocarbons etc.


It is however also important to mention that this synthetic rubber compound does not stand up well to ketones and acetones. For instance, just as is the case with butyl, gas permeability is low. It is incompatible with ammonia gas amines and alkalis, fomic and acetic fluids, super heated steam and glycol-based brake fluid.

Applications Of Viton ® (FKM Fluoroelastomer) Rubber


Viton ® (FKM Fluoroelastomer) lined tubing and hoses are used in are commonly used in automotive applications involving the handling of or exposure to high bio-diesel concentrations. This also includes any applications involving the transportation of such fuels as well.

In automotive sealing Viton ® (FKM Fluoroelastomer) polymers, in the form of O-rings, are used due to their high level of compatibility with hydrocarbons. They are also used in vehicle timing units due to their enhanced chemical and temperature resistance properties.


Viton ® (FKM Fluoroelastomer) polymer based o-rings are used in SCUBA equipment designed to use Nitrox gases for extended periods. The risk of igniting the increased oxygen content in Nitrox gases is lower with Viton ® (FKM Fluoroelastomer). Furthermore, the risk of decay is reduced with the use of this polymer.


Viton ® (FKM Fluoroelastomer) polymers are known for their ability to stretch without being compromised. This means that they are suitable for use in making gaskets for a variety of applications.

After reading the above, you should have a clear idea of what Viton ® (FKM Fluoroelastomer) rubber polymers are and what they are used for.

Viton ® (FKM Fluoroelastomer) gasket sheet material is available for purchase in our store.