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FKM Seals Resist a Wide Range of Chemicals and Temperatures

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FKM Seals Resist a Wide Range of Chemicals and Temperatures FKM Seals Resist a Wide Range of Chemicals and Temperatures Parco fluorocarbon seals offer outstanding Standard fluorocarbon polymers are commonly resistance to aggressive chemicals and high divided into three types: A, B, and F, in order of temperatures. Our high-quality fluorocarbon seals increasing fluorine content. In general, higher have a long history of reliable performance in fluorine content provides improved chemical service temperatures from -40° to +400°F. For resistance but decreased low-temperature superior resistance to chemicals and continuous flexibility. Specialty fluorocarbon polymers are also service temperatures as high as 600°F, consider available for applications requiring improved Parco’s perfluoroelastomer seals. performance in caustic fluids and low temperatures. Specialty fluorocarbons include GLT, The American Society for Testing Materials (ASTM) GFLT, LTFE, and ETP.1 document D1418, Standard Practice for Rubber and Rubber Latices—Nomenclature, uses the If you are unfamiliar with the different elastomers abbreviation FKM for compounds made from used for seals, refer to Parco’s Elastomer Selection fluorocarbon polymer. Guide. That guide will help you to select the correct elastomer for your application. If you Parco offers fluorocarbon compounds to resist a determine that fluorocarbon seals are right for wide range of chemicals and temperatures. The your application, this guide will help you select the most common type of fluorocarbon polymer correct compound. contains 66 percent fluorine and is a copolymer of vinylidene fluoride (VF2 or VDF) and Parco’s fluorocarbon seals have a long hexafluoropropylene (HFP). Other types of history of reliable performance in service fluorocarbon polymer contain tetrafluoroethylene temperatures from -40° to +400°F. For (TFE) for improved chemical resistance. Some types continuous service temperatures as high as of fluorocarbon polymer contain 600°F, consider Parco’s perfluoroelastomer perfluoromethylvinyl ether (PMVE) for improved seals. flexibility at low temperatures. 1A, B, and F are popular types of fluorocarbon polymer originally developed by DuPont Performance Elastomers. Other fluorocarbon polymer suppliers use different names for their equivalents. GLT, GFLT, and ETP are Genuine Viton® fluorocarbon polymers made by DuPont. Viton® is a registered trademark of Dupont Performance Elastomers. LTFE is a fluorocarbon polymer made by Dyneon, a 3M Company. Characteristics of F-Type fluorocarbons provide excellent Fluorocarbon Types resistance to flex fuels. F-Type has the best fluid resistance of all the standard fluorocarbons. Below is a brief description of the various types of (Fluorine content of polymer is about 70%) fluorocarbon polymer. Figure 1 compares the resistance to common fluids among the Specialty Fluorocarbons fluorocarbon types. Low temperature resistance Specialty fluorocarbon polymers use a peroxide also varies based on the fluorocarbon type, as cure system for improved resistance to steam and shown in Figure 2. acid. Specialty fluorocarbons generally have better low-temperature flexibility than standard Standard Fluorocarbons fluorocarbons. Specialty fluorocarbon polymers Standard fluorocarbon compounds typically use a GLT, GFLT, and ETP are Genuine Viton®. bisphenol cure system, which provides fast cure cycles and improved resistance to compression set. GLT fluorocarbons offer excellent low- Some standard fluorocarbons use a peroxide cure temperature flexibility and fluid resistance similar system to improve resistance to steam, acid, and to A-Type. Compounds using GLT typically have a aggressive automotive lubricating oils. temperature retraction value (TR-10) of -22°F. (Fluorine content of polymer is about 64%) A-Type fluorocarbons or dipolymers, are used for general-purpose sealing. A-Type offers the best GFLT fluorocarbons combine excellent resistance to compression set among all low-temperature flexibility and fluid resistance fluorocarbons. A-Type is not recommended for similar to F-Type. Compounds using GFLT typically use in amines, low molecular weight carbonyls, or have a TR-10 value of -11°F. (Fluorine content of flex fuels. (Fluorine content of polymer is about polymer is about 67%) 66%) LTFE fluorocarbons have the best low- temperature flexibility of any fluorocarbon and ”Flex-fuel vehicles” can use various blends of fluid resistance similar to GFLT. Compounds using gasoline and alcohol as fuel. “Flex fuels” refer to those blends and typically have LTFE typically have a TR-10 value of -40°F. alcohol content of 15 percent or more. Parco (Fluorine content of polymer is about 67%) recommends its seals made from F-type polymer for use in flex fuels. ETP fluorocarbons were developed as a cost-effective alternative to perfluoroelastomers. ETP fluorocarbons offer similar reliable service in B-Type fluorocarbons offer better chemical aggressive chemicals, but at a fraction of the cost. resistance than A-Type. B-Type has improved ETP fluorocarbons also have excellent resistance resistance to aromatic hydrocarbons and automotive fuels containing alcohols and ethers to low molecular weight carbonyls, amines, and such as methyl tertiary butyl ether (MTBE). caustic bases. (Fluorine content of polymer is (Fluorine content of polymer is about 68%) about 67%) Overview of Popular Parco “Qualified Products Lists” (QPLs) identify Fluorocarbon Compounds companies authorized to manufacture and sell products to various specifications. Before being Below is an overview of Parco’s most popular added to a QPL, a company must undergo a fluorocarbon compounds.2 All compounds are rigorous evaluation of its quality system. Parco black unless stated otherwise. For help choosing is approved by the Air Force and Performance the appropriate Parco compound for your Review Institute to supply QPL rubber seals for application, please refer to the Selection Diagram aerospace and defense applications. in Figure 3. 9166-75 Compounds for Applications with 75-durometer fluorocarbon; excellent resistance to Service Pressures up to 1,500 psi fuels, alcohols, and solvents; blue. (Polymer: ETP) 9066-753 9167-60 75-durometer fluorocarbon; excellent resistance to 60-durometer fluorocarbon; excellent resistance to compression set; improved low-temperature compression set; superior low-temperature flexibility (TR-10 value of -25°F); meets the flexibility (TR-10 value of -40°F); UL-listed. requirements of Aerospace Material Specification (Polymer: LTFE) (AMS) R 83485. (Polymer: GLT) 9266-75 9131-75 75-durometer fluorocarbon; general-purpose; 75-durometer fluorocarbon; excellent resistance to excellent resistance to compression set; resistant to fuel; good resistance to compression set; improved high-temperatures; meets the requirements of low-temperature flexibility (TR-10 value of -10°F); AMS 7276, AMS R 83248, and MIL R 83248, on UL-listed. (Polymer: GFLT) Qualified Products List (QPL).4 (Polymer: A-Type) Fig. 1 Fluid Resistance of Fluorocarbon Types Fluorocarbon Types Common Fluids A B F GLT GFLT LTFE ETP Examples Aliphatic hydrocarbons, process fluids Propane, acetylene Aromatic hydrocarbons, process fluids Toluene, benzene Automotive & aviation fuels Gasoline, JP-4 Oxygenated automotive fuels E85 (containing MeOH, EtOH, MTBE, etc.) Engine lubricating oils (SM-SL grades) Castrol, Mobil, Pennzoil engine oils Acids Hydrochloric acid, phosphoric acid Hot water, steam Strong bases (high pH), amines Diethylamine, ammonia Low molecular weight carbonyls, ketones Acetone, MEK Fluorine content of polymer, pct. 66 68 70 64 67 67 67 Low-temperature flexibility (TR-10 value °F) 3 9 21 -22 -11 -40 10 Legend: Recommended Minor-to-moderate effect Moderate-to-severe effect Not recommended Source: Sales literature from polymer manufacturers. 2Compounds are listed in this brochure by compound number. 3Last two digits of compound number identify hardness (durometer, Shore A). 4Military Specification MIL R 83248 has the full title Rubber, Fluorocarbon Elastomer, High Temperature, Fluid, and Compression Set Resistance. 9500-75 75-durometer fluorocarbon; general-purpose; Fig. 2 Low-Temperature Flexibility of Fluorocarbon Types excellent resistance to compression set; low cost. 25 (Polymer: A-Type) F 9505-75 ETP B A F) 0 75-durometer fluorocarbon; general-purpose; ° excellent resistance to compression set; low cost; GFLT brown. (Polymer: A-Type) GLT TR-10 Value ( TR-10 Value -25 Compounds for Applications with Service Pressures of 1,500 psi or More LTFE 9009-90 -50 90-durometer fluorocarbon; general-purpose; Source: Sales literature from polymer manufacturers. excellent resistance to compression set; resistant Specialty fluorocarbons provide better low- to high-temperatures; meets requirements of temperature resistance than standard specifications AMS 7259, AMS R 83248, and fluorocarbons. Parco’s seals made from LTFE offer the best low-temperature resistance. MIL R 83248; on QPL. (Polymer: A-Type) 9021-95 95-durometer fluorocarbon; excellent resistance Rely on Parco to compression set; better extrusion resistance than 9009-90. (Polymer: A-Type) Parco is a leading manufacturer of high- performance seals. We specialize in developing 9115-95 proprietary elastomeric compounds and 95-durometer fluorocarbon; excellent resistance bonding techniques. Parco’s seals are available to steam and acid; good resistance to in 340 compounds, more than 25 percent compression set; excellent resistance to developed in the last five years. explosive decompression and extrusion. (Polymer: B-type) Founded in 1941,
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