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FFKM O-Rings: The Ultimate FAQ Guide

If you are looking for FFKM O-Rings for your project, or if you want to learn more about FFKM material, please follow me to read this FAQ Guide.

This guide provides a comprehensive overview of all FFKM O-Ring materials, properties, temperatures, media, applications, design, installation, etc.

It gives you all information, and you quickly select the right seal for your project.

What does FFKM Mean?

FFKM is Perfluoroelastomer (synthetic rubber), also called FFPM.

FFKM has excellent resistance to high temperature and chemical corrosion and can resist the corrosion of more than 1600 kinds of chemicals.

And it also has the elasticity of rubber, and its compression deformation rate at 330℃ is only below 50%.

Except for swelling in fluorinated solvents, it is stable to all chemicals.

In addition to excellent chemical resistance and heat resistance, FFKM O-Ring is homogeneous and has no surface troubles such as permeation, cracking, and pinholes.

These features can improve FFKM O-Ring sealing performance, extend the operating cycle of machinery and effectively reduce your maintenance costs.

What is FFKM Material Made of?

Perfluoroelastomer FFKM materials are terpolymers consisting of monomers.

All hydrogen atoms are replaced by fluorine.

The absence of hydrogen in the molecular chain significantly improves their chemical and thermal resistance.

This allows FFKM O-Ring to provide excellent sealing performance

What is the Difference between FFKM and FKM?

FKM Temperature Range

Static seal: -26℃~232℃, short time up to 275℃
Dynamic seal: -15℃~200℃
GLT type: -45℃~215℃

FKM Characteristics:

High-temperature resistance, acid and alkali resistance, oil resistance, chemical corrosion resistance, high-temperature resistance is better than silicone rubber, excellent chemical resistance, resistance to most oils and solvents (except ketones, esters), weather resistance, and ozone resistance;

The cold resistance is relatively poor. The general use temperature range is -20~250 ℃, and the special formula can withstand low temperatures to -40 ℃.

Perfluoroelastomer FFKM Temperature Range

The general application temperature is sustainable for 260 ℃ to 290 ℃, and can be used intermittently for 316 ℃ high temperatures.

Perfluoroelastomer FFKM O-rings, mainly used in the semiconductor industry, have chemical resistance close to PTFE and are therefore resistant to basically all chemical liquids and gases, such as organic acids, inorganic acids, bases, ketones, esters, and alcohols.

FFKM O-Rings have the excellent chemical resistance of Teflon but also have the elasticity of rubber, excellent heat resistance, and cleanliness. According to the temperature, long-term use can be divided into long-term 250 degrees, long-term 280 degrees, long-term 300 degrees, long-term 320 degrees

Different Molecular Structures of FKM and FFKM

From the molecular structure, unlike FKM, the carbon atoms of the main chain or side chain of perfluoroelastomer rubber FFKM are all bonded with fluorine atoms. Compared with FKM, it has higher fluoride content, and the general fluorine content of the finished product of perfluoroelastomer FFKM is between 74-76%. Because the fluorine content is higher than FKM, the perfluoroelastomer rubber has the best temperature and chemical resistance among all elastomers.

FFKM O-Rings can also resist the corrosion of strong acids, strong alkalis, ethers, ketones, esters, nitrogenous compounds, hydrocarbons, alcohols, aldehydes, oils, vapors, amine compounds, and other chemical products.

The main feature of FFKM perfluorinated ether O-ring is that it is unaffected by almost all fluids, including aliphatic, aromatic, ester, ether, ketone, oil, lubricant, and most acids. Some halides and strong oxidizing acids can cause material swelling effects.

The general application temperature of FFKM O-Rings is sustainable for 260℃ to 290℃ and can be used intermittently at a high temperature of 316℃. Ozone and weather and flame resistance are excellent, radiation resistance is still possible, but also can be used for high vacuum materials.

Perfluoroelastomer FFKM is used in applications where fluoroelastomer cannot perform and where conditions are harsh. Make seals for various media, such as rocket fuel, umbilical, oxidizer, nitrous oxide, fuming nitric acid, etc., used in aerospace, aviation, chemical, petroleum, nuclear energy, and other industrial sectors.

FFKM has More High-Temperature Resistance than FKM

FKM and other rubber products at 240°C, the deformation rate rises sharply with time, while the compression deformation of full FFKM always stays below 50%.

FFKM can maintain the elastic characteristics of rubber even at 300°C.

FFKM has more excellent chemical properties than FKM In terms of chemical resistance, FKM cannot be used in ether, amine compounds, ketones, oxidizers, organic solvents, fuels, acids, bases, and other environments, but FFKM can all show its excellent stability and has excellent resistance to almost all chemicals.

FFKM O-Rings can withstand up to 1600 chemicals.

After 6 months of immersion in a mixture of toluene, acetone, and methylene chloride, FFKM O-Rings showed almost no volume change, while other rubbers were already severely deformed

What’s the Difference between FFKM and PTFE?

PTFE is made of tetrafluoroethylene and contains only carbon and fluorine. The material is very hard.

FFKM is made from tetrafluoroethylene, vinylidene fluoride, and perfluoromethyl vinyl ether, so in addition to carbon and fluorine, it contains hydrogen and oxygen. These additional monomers make the polymer an elastomer. The material is soft.

PTFE and FFKM are different polymers, FFKM is an elastomer and PTFE is a rigid plastic.

However, FFKM has the elasticity and the thermal and chemical stability of PTFE.

In addition, FFKM not only has excellent resistance to high temperature and chemical corrosion like PTFE (it can resist corrosion of more than 1600 kinds of chemicals), but also has the elasticity of rubber, and its compression deformation rate at 330℃ is only below 50%.

If you are looking for a soft elastomer for your project, we recommend FFKM O-Ring.

How do you Choose FFKM Grade?

You can refer to the FFKM grades for different industries below.

If your industry is not mentioned, you can contact us and we will customize the right FFKM grade O-Ring for you.

What is FFKM O-Ring?

Perfluoroelastomer FFKM O-ring is the most expensive rubber elastomer seal available, with exceptional chemical resistance.

FFKM O-rings have excellent elongation and sealing properties and are resistant to most chemicals, including organic acids, inorganic acids, alkalis, ketones, alcohols, aldehydes, and fuels.

Therefore, FFKM o-rings can be used in most chemical and petrochemical processes for a long time.

In other media where rubber can swell or fail, FFKM will not swell or become brittle but will retain its original quality.

When you install an FFKM O-Ring, it is very easy to fit and more adaptable to incorrect installation than metal seals, without causing wear.

What is FFKM O-Rings Temperature Range?

Long-term working temperature -39~288 degrees Celsius, short-term up to 315 degrees Celsius.

FFKM O-Ring still has certain plasticity below the embrittlement temperature, hard but not brittle, and can be bent.

What is FFKM O Ring Chemical Resistance?

Perfluoroelastomer FFKM is the best rubber material among all elastic sealing materials in terms of high-temperature resistance, chemical solvent resistance, and high cleanliness characteristics.

FFKM O-Ring is also resistant to chemicals and corrosive media (strong acids, strong bases, ethers, ketones, esters, nitrogenous compounds, hydrocarbons, alcohols, aldehydes, oils, vapors, amine-based compounds, and more than 1600 chemical products), and can withstand temperatures up to 327°C.

Different FFKM grade materials are suitable for various types of chemical solvents with different concentrations as follows.

Acids, bases, amines, oxides, hot water and water vapor, and other solvents.

How Long will FFKM O-Ring Last?

Different FFKM grades have a different service life, now I will take the commonly used FFKM 6375 O-Ring as a case study, so you can understand it more clearly.

FFKM 6375 O-Ring was used in a mechanical seal in a mixture of ammonia/tar and water at 35°C and successfully sealed for 10 months.

Mechanical seals in a mixture of EO, PO, amine, and chloromethane at 232°C do not require the replacement of FFKM O-Ring until after 10 months.

Kettle seals in amine and propylene oxide at 40-90°C are not replaced until 5 months after the kettle O-Ring.

In the mechanical seal of the production line of harsh and highly corrosive epichlorohydrin, successfully used in various environments with temperatures -20~220℃, the average service life is 9 months, mostly when the equipment is replaced.

What are the Advantages of FFKM O-Ring?

It has excellent chemical resistance, and heat resistance, and the product is homogeneous with no surface troubles such as permeation, cracking, and pinholes.

These features improve sealing performance, extend operating cycles, and effectively reduce the cost of maintaining your company.

The long life of FFKM O-Rings will minimize unplanned downtime, improve equipment utilization and optimize capacity.

The long-term efficacy of perfluorinated ether rubber sealing parts can improve your equipment’s productivity and reduce maintenance and costs

The total cost of these is much higher than your initial purchase price.

Selecting and installing FFKM O-Rings can extend the average maintenance time, reducing your unscheduled downtime and repair costs.

For some special industries, the cost of unscheduled downtime is much greater than the cost of parts and labor for repairs.

FFKM O-Rings can effectively help users to improve the stability of the process, extend the working time of the equipment and get the maximum benefit for customers.

What are the Disadvantages of FFKM O-Ring?

1. Poor low-temperature resistance

The lowest temperature of the FFKM O-Ring is -20℃.
Other special rubber can withstand -60℃.

2. Price Expensive

FFKM material is the most expensive of all rubber types. Only a few manufacturers in the world produce this material.
It is several times or tens of times more expensive than other types of rubber.

3. Poor pressure change performance

FFKM O-Ring has poor compression performance and general elasticity than fluorine rubber.

How Much does FFKM O-Ring Cost?

FFKM O-Ring prices depend on your size, order quantity, and different grades.

In general, the unit price is from $1 to $300, the larger the size, the more expensive the unit price.

We have molds for all American Standard O-Ring sizes, so you don’t need to pay extra for the molds.

Where Can You Use FFKM O-Ring?

Pumps and Mechanical Seals

Safety valves and fixed ball valves

Oil & Gas Pipeline Analysis Samplers

Level switches Level transmitters

Spraying Equipment Rotary Cup, Rotary Disc Spray Guns

Oil and Gas Extraction

• Oil recovery equipment, downhole tools

• Submersible electric pumps

• Packers

• Testers

• Concentric tubing hangers

• Downhole safety valves

There are many other industries that need FFKM O-Ring, if you don’t see your related equipment, please contact us, we can manufacture FFKM O-Ring or FFKM seal gasket for any industry.

How To Make Custom FFKM O-Ring?

Please see the following steps

1: Structure design

According to the working condition and chemical medium of your equipment to decide which grade of FFKM to use, we also have to measure the size of the installed groove to decide the size of the O-ring.

2：Mold making

When the size and quantity of the FFKM O-Ring are confirmed, we can make the mold of the O-ring.

3: Raw material testing

After purchasing FFKM raw materials, we need to test the parameters of performance.

4：T90 sulfur change test

5: Compression Molding

We start to produce your FFKM O-Ring with the finished mold.

6: Secondary Vulcanization

Our finished FFKM O-Ring will be put in the oven to do secondary vulcanization, which can improve the mechanical properties and compression permanent deformation of the O-Ring.
Achieving optimal performance, dimensional characterization requires 10 to 42 hours of vulcanization.

7: Low-temperature trimming

Use the low-temperature cooling machine to trim the raw edge of the O-Ring.

8：Size and appearance inspection

Use testing equipment to test whether the size of the FFKM O-Ring is within the tolerance range.

9：Product performance testing

Test the hardness, tensile strength, elongation at break, and other physical parameters of FFKM O-Ring.

10：Product packaging

Usually, we use plastic bags to pack FFKM O-Ring, and then put them into cartons.

As a professional FFKM O-Ring designer and manufacturer, Yoson guarantees competitive prices while adhering to strict quality standards.

Contact us now for all FFKM O-Ring inquiries and questions.