FFKM O-ring
The permeability is low and the material has low outgassing values, especially at temperatures above 200°C. This makes it ideally suited for vacuum applications, especially in the Semicon industry.
- Product Introduction
Crestmat is a leading rubber material and rubber product supplier in China. The factory has been devoted in special rubber compounding for more than 30 years. The products mainly include rubber materials like fluorosilicone (FVMQ), arylate rubber (ACM), Hydrogenated Nitrile (HNBR), fluoroelastomer (FKM) and rubber calendering products such as HNBR sheet, FKM sheet, fluorosilicone sheet and rubber extruded products such as fkm o ring cord, HNBR rubber cord, fkm profile and high quality ffkm oring. The products are widely used in aviation, automobile, petroleum, marine, semi-condutor and many other fields. The rubber compounding factory is well equiped with Japan-made banburies, two-roller mixers, reaction kettle, strainer; the rubber product factory is equiped with Rotocure machine, press machine, extruder. The lab is equiped with Rheometer, Hardness Testor, Elongation Testor, Rotary Viscosimeter, Biochemitry Incubator.
Why Choose Us
Advanced Equipment
The rubber compounding factory is well equiped with Japan-made banburies, two-roller mixers, reaction kettle, strainer; the rubber product factory is equiped with Rotocure machine, press machine, extruder.
Professional Team
FKM material is equiped with 3 production lines, one for precompounds, one for black compounds, one for colorful compounds. The maximum capacity for fluoroelastomer compound and polymer is 4800 tons per year.
High Quality
In our Reaserch and Development Certer, we have a leading laboratory equiped with a full sets of testing machinary. Here we can develop the new formulations and also test the rheological properties and physical properties for each batch of orders.
Customized services
The rubber compounding factory is well equiped with Japan-made banburies, two-roller mixers, reaction kettle, strainer; the rubber product factory is equiped with Rotocure machine, press machine, extruder. The lab is equiped with Rheometer, Hardness Testor, Elongation Testor, Rotary Viscosimeter, Biochemitry Incubator.
Deluted acids and bases resistance
Concentrated acids and bases resistance
Ozone resistance
► Product name: FFKM O-ring
► Hardness: 70~90 (Shore A)
► Properties: excellent Chemical resistance, excellent High temperature resistance.
FFKM O-rings are carbon-fluorine bond with one of the best thermal, oxidative and chemical stability of fluorinated polymers. High reliability for dynamic and static applications and stability for aggressive media. FFKM currently offers the highest operating temperature range, the most comprehensive chemical compatibility, and the lowest off-gassing and extractable levels due to the combination between the carbon-atom and fluorine-atom. FFKM has poor low temperature performance.
The permeability is low and the material has low outgassing values, especially at temperatures above 200°C. This makes it ideally suited for vacuum applications, especially in the Semicon industry.
Benefits of FFKM O-ring
Extremely temperature resistant
One of the primary benefits of using FFKM for o-rings is its extreme temperature resistance. FFKM formulations can withstand operating temperatures as low as approximately -49°F (-45°C) and as high as 635°F (335°C).
Nearly universal chemical resistance
FFKM offers the best chemical resistance on the market, in terms of the number of chemicals and compatibility with them. FFKM is resistant to over 1,800 chemicals, solvents, and plasmas.
Excellent weather ability and ozone resistance
When designing a seal for use outdoors, additional elements come into play, such as weather and ozone exposure. When a seal experiences the fluctuations in temperature, humidity, and other elements brought on by being outdoors, they can quickly degrade, resulting in failure and leaks. Thus, using a material like FFKM that readily withstands weathering and ozone exposure is pivotal to sealing success.
Non-flammable in air
Some alternatives to FFKM materials can be flammable, which, of course, creates a risk to the application, environment, and personnel. FFKM is both self-extinguishing and non-flammable.
Low outgassing properties
Outgassing (or offgassing) refers to when a polymer puts off vapors, usually under high temperatures or low pressures. In high sensitivity applications in harsh environments, such as pharmaceuticals, semiconductor manufacturing, or vacuum environments, like outer space, outgassing is of particular concern. The extractables put off during outgassing can damage sensors or harm sterility.
Good mechanical properties
FFKM o-rings offer excellent compression set and sealing performance thanks to FFKM's mechanical properties.
Temperature plays a significant role in the performance and longevity of FFKM O-rings. It directly affects the elasticity and sealing performance of the material because every material is designed to function within a specific temperature range based on its unique chemical composition. Exceeding this range can lead to material degradation and seal failure.
Temperature range refers to the spectrum of temperatures at which an FFKM O-ring can effectively function. This range is largely dependent on the materials from which FFKM O-rings are manufactured.
For example, nitrile FFKM O-rings, a commonly used material known as NBR or buna-N, have a general-purpose temperature range of -31ºF to 248ºF. Until you know the specifics of the media and your actual temperature range, nitrile is your baseline.
For more extreme temperatures, fluorocarbon, also known as Viton® FFKM O-rings, could be a better choice for you as they can withstand temperatures up to 400ºF.
Other materials, like Teflon (PTFE) and silicone, are also common, depending on the needs of your application. Each material is designed for a specific function, so starting with the temperature range helps you narrow down your options and make selecting the right seal easier.
Other Key Factors In Your FFkm O-Ring Selection
While temperature is a critical factor, other elements such as media, application type (static or dynamic), and pressure also play a significant role in FFKM O-ring selection. These factors interact with temperature, influencing the selection of the right sealing solution.
Media
The fluid or gas (or media) that the seal will interact with can affect its performance at a given temperature. Different materials have different levels of compatibility with each media. When you understand the media in your application, you can narrow down your material choices rather quickly.
Application type
A static application, where the seal sits in a groove and doesn't move, has different requirements than a dynamic application, where the seal is in motion. By considering the application, you can anticipate wear and tear and eliminate more material options.
Pressure
The pressure conditions can also affect a seal's performance. High pressure can cause extrusion or deformation, while vacuum conditions can lead to gas permeation. Make sure you choose a seal that can handle the pressure conditions you need for your application.
Both materials are well suited for use in the -15 to 205°C range. FKM has an advantage in lower temperatures and FFKM has an advantage in higher temperatures. offers specific compound formulations extending these ranges even futher as can be seen in the following compound comparison chart. When comparing these materials with respect to electrical current resistance, FFKM has a slight advantage. The differences in compression set resistence show that FKM has a slight advantage. Additionally, FKM has a slight advantage when considering wear resistance. Also, both materials are equally poor when comparing heat stability.
Furthermore, FFKM has a slight advantage when comparing short term resilience. Finally, FKM has a slight advantage when evaluating differences in permeation resilience. Both materials are resistant to steam, ozone, solvents, broad spectrum chemical resistance, aliphatic hydrocarbons, chlorinated hydrocarbons and aging, with FFKM having specific resistences to weathering and sunlight, water, ketones, esters, ethers, almost universal chemical resistance, extreme high temperatures, inorganic acids and organic acids. FKM has specific resistence to compression set, common fuels, mineral oils, vegetable oils, greases, aromatic hydrocarbons, non-flammable hydraulic fluids, silicone oils, strong acids, petroleum oils, brake fluids, acetone, halogenated hydrocarbons, di-ester lubricants, vacuum and most acids.
O-Ring Material Selection Guide
Most popular elastomer O-ring material. Parker Hannifin uses 70 durometer hard nitrile (Buna-N) for most of its standard O-rings supplied, with 90 durometer available for tube fittings and adapters. Seal professionals value Buna-Nitrile elastomer for competitive price and excellent resistance properties to petroleum-based oils and fuels, silicone greases, hydraulic fluids, water, and alcohols.
EPDM has a spotless reputation in the sealing world because of its excellent resistance to heat, water and steam, alkali, mild acidic and oxygenated solvents, ozone, and sunlight (UV). Nevertheless, experts do not recommend EPDM compounds for gasoline, petroleum oil and grease, and hydrocarbon environments.
Neoprene is a general-purpose elastomer with moderate resistance properties to petroleum oils and weather (ozone, sunlight, UV, and oxygen). Neoprene O-rings have a relatively low compression set, good resilience, abrasion, and are flex cracking resistant.
Perfluoroelastomers (FFKM) are an extension of the Fluorocarbon FKM elastomers extending the compatibilities of the FKM while at the same time extending the upper temperature limits of the materials while compromising the lower temp limits. FFKMs are the cleanest/purest compounds available on the market. They are the first choice for clean applications and are particularly popular in the semiconductor industry.
Silicone O-rings have many outstanding properties, including excellent flexibility and fatigue life, strong ozone, and UV radiation resistance. Despite the abovementioned characteristics, experts do not recommend silicone O-rings for dynamic applications. The low strength and poor abrasion resistance as well as high gas permeability, make them not compatible with the most petroleum fluids, ketones, water, and steam.
Polytetrafluoroethylene (PTFE) O-rings are designed to be used in harsh environments with temperatures ranging from -450°F to 600°F. PTFE O-rings are compatible with the widest range of chemicals, such as acetone, isopropyl, methyl, etc. Furthermore, they have low gas permeability and low absorption. Unfortunately, due to polytetrafluoroethylene material properties, pure PTFE O-rings are very rigid and hard to apply. Therefore, manufacturers, including Parker, solve this problem by mixing PTFE material with various fillers to provide users with more flexibility. PTFE seals are often used in food, pharmaceutical, and medical industries.
Comparison with Other Elastomers' Chemical Resistance
When evaluating chemical resistance, FFKM O-Rings are unmatched by other commonly used elastomers such as:
NBR (Nitrile Rubber)
Although cost-effective, NBR lacks the comprehensive chemical compatibility found in FFKM, particularly when exposed to strong acids and solvents.
FKM (Fluoroelastomer)
While offering better resistance than NBR, especially to hydrocarbons, FKMs are less resistant to ketones and amines, making FFKM a superior option for broader chemical exposure.
EPDM (Ethylene Propylene Diene Monomer)
EPDM performs well in basic and some acidic environments, but cannot compete with the universal chemical resistance of FFKM O-Rings.This makes FFKM O-Rings particularly suitable for the most challenging applications, where exposure to a variety of chemicals is expected and where other materials would rapidly degrade. Choosing FFKM O-Rings translates to fewer seal replacements, lower maintenance costs, and minimal operational downtime.
Factors Affecting the Lifespan of FFKM O-Rings
The durability of FFKM O-Rings is influenced by several factors:
Quality of Material: The purity and grade of FFKM used in the O-ring's manufacture impact its overall lifespan.
Operating Conditions: Continuous exposure to extreme temperatures, pressures, and corrosive chemicals can eventually degrade FFKM O-rings.
Compression Set: The ability of FFKM to maintain elasticity and shape over repeated compressions affects its wear over time.
Installation and Fit: Proper installation and ensuring the correct O-ring size and fit are vital to prevent early failure.
Maintenance Practices: Regular inspections and maintenance protocols can help detect issues before they lead to O-ring failures.
Highlighting the balance between performance and cost, assessing FFKM O-rings' lifespan is a strategic consideration in the selection process. By understanding which factors contribute to the wear and durability of these components, industries can better predict maintenance schedules, reduce downtime, and optimize their operations in extreme conditions.
Essential Roles of FFKM O-Rings in Diverse Industrial Applications
FFKM O-Rings, recognized for their unparalleled performance in the harshest of conditions, have become a crucial component across various demanding industrial sectors. Their unique ability to withstand extreme temperatures and resist aggressive chemicals enables them to offer reliable sealing solutions where other materials fall short.
Oil and Gas Industry
Within the oil and gas sector, FFKM O-Rings are indispensable, providing exceptional sealing integrity in high-pressure, high-temperature environments such as downhole drilling, where they help prevent costly leaks and ensure safety under intense operating conditions.
Aerospace Applications
The aerospace industry benefits from FFKM O-Rings due to their superior resistance to jet fuels, hydraulic fluids, and engine lubricants. These seals are employed in critical components of aircraft systems, where failure is not an option, safeguarding both performance and passenger safety at extreme altitudes and speeds.
Chemical Processing
In chemical processing plants, FFKM O-Rings are utilized for their unmatched chemical resistance, functioning effectively to contain and protect processes involving corrosive substances, high-purity chemical streams, and reactive compounds that can degrade other elastomers.
FFKM O-Rings Installation and Handling Best Practices
FFKM O-Rings are essential components in many industrial applications requiring superior thermal stability and chemical resistance. Ensuring these high-performance seals deliver their full potential depends significantly on proper installation and handling practices. Following a step-by-step guide and adhering to manufacturer guidelines are pivotal steps for extending the lifespan of FFKM O-Rings. Careful installation of FFKM O-Rings is critical to prevent early failure and to maintain the integrity of the sealing environment. Here's a procedural guide:
Inspection: Always inspect the O-Ring for any surface defects or deformities before installation.
Sizing: Verify that the O-Ring size is appropriate for the groove to ensure a proper seal.
Lubrication: Apply a compatible lubricant to ease installation and prevent damage during assembly.
Installation Technique: Avoid twisting or stretching the O-Ring. Use a rolling or pushing method where possible.
Groove Condition: Ensure the groove is clean, free of debris, and has no sharp edges that could cut or damage the O-Ring.
Final Check: Once installed, perform a final inspection to confirm that the O-Ring is not pinched or displaced.
How does the thermal impact affect FFKM O-ring sealing performance?
The thermal impact significantly affects the sealing performance of perfluoroelastomer (FFKM O-ring) materials. FFKM O-ring seals are known for their exceptional resistance to extreme temperatures, both high and low. Here's how temperature impacts their performance:
High-Temperature Exposure
At elevated temperatures, FFKM O-ring seals can undergo degradation processes such as de-vulcanization, thermal aging, or compression set. This results in hardening of the material, loss of elasticity, and ultimately a reduced ability to maintain an effective seal. The rate of degradation accelerates with an increase in temperature.
Low-Temperature Performance
At very low temperatures, FFKM O-ring materials tend to become stiffer and less flexible. This decrease in elasticity can lead to difficulties in maintaining a proper seal, as the material might not conform adequately to the mating surfaces. This is critical in applications where temperature fluctuations are common.
Thermal Cycling
Frequent changes in temperature can cause the FFKM O-ring seals to expand and contract repeatedly. This thermal cycling can lead to mechanical stresses within the material, potentially causing cracks, leaks, or overall failure of the sealing system.
Our Factory
Crestmat is a leading high performance rubber material and rubber product supplier in China. The factory has been devoted in special rubber compounding for more than 30 years.
FAQ
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