The oldest and most common elastomers in the Viton® product line. They generally have 66% fluorine content and are
supplied to the most common aerospace specifications including MILR-83248. These grades are considered general purpose
Viton®. A or E types exhibit low compression set, but are not resistant to flex fuels containing high levels of alcohol or MBTE.
Developed to increase the fluorine content and offer better fluid resistance to acids and flex fuels than the A or E types.
They generally have 67% fluorine content and are commonly used in applications where resistance to flex fuels containing alcohol or MTBE is required.
An extension of the B type technology with further increases in fluorine content to provide better fuel
and solvent resistance. They generally have 70% fluorine content and are used in flex fuel and
agricultural applications where a variety of very aggressive chemicals are routinely used.
Developed to improve the low temperature flexibility as compared with traditional A or E type Viton®.
The low temperature flexibility normally reaches -40°F. They generally have 65% fluorine
content and are not suitable for flex fuels or aggressive solvents.
Developed to balance fluid resistance with improved low temperature flexibility. They generally have 68% fluorine
content and are rated to -35°F. These materials are suitable for flex fuel applications.
Developed to improve the balance of mechanical properties with improved fluid resistance. Generally containing
69% fluorine content, these materials exhibit excellent resistance to flex fuels, agricultural chemicals as
well as dramatically improved compression set resistance as compared with other high fluorine content materials.
The tradename for a copolymer of tetrafluoroethylene and propylene (TFE/P) available from Asahi Glass. Developed
to provide resistance to strong bases, amines, and polar solvents such as acetone and methyl ethyl ketone (MEK).
They generally have 60% fluorine and are typically considered for use in the chemical process and energy industries.
Chemically, a terpolymer of Ethylene, Tetrafluoroethylene and Perfluoro Methyl Vinyl Ether. The first letters
of these three components form the acronym “ETP” that is sometimes used to describe this product. These
materials generally have 73.5% fluorine, and offer improved resistance to aggressive solvents.
This material generally contains 74.5% fluorine, which further improves aggressive chemical resistance. Hifluor
is an attractive alternative in the chemical processing industry where very good chemical resistance is required
without the 500°F+ heat resistance of a perfluorinated elastomer.
Permeability - All elastomers are permeable to fuels, although the resistance of individual classes of elastomers vary widely.
Fluoroelastomers like Viton® have the lowest permeability to fuel of any other class of elastomers used commercially in automotive fuel systems.
- The designations shown (ie., A, B, GF, GLT) are based on widely recognized nomenclature
established by Dupont Dow Elastomers. Other Flourocarbon polymer suppliers use different
designations for the various types listed here.
- AFLAS® is a registered trademark of Asahi Glass Co., Ltd.
- Viton® is a trade name of Dupont Dow Elastomers.