Fluorocarbon rubber (FKM Viton ®) has excellent resistance to high temperatures, ozone, oxygen, mineral oil, synthetic hydraulic fluids, fuels, aromatics, and many organic solvents and chemicals. It has a higher resistance to swell in high octane and oxygenated fuel blends.

Low-temperature resistance is normally not favourable and for static applications is limited, although in certain situations it is suitable down to -40°F (-40°C). Gas permeability is very low and similar to that of butyl rubber. Special fluorocarbon compounds exhibit improved resistance to acids, fuels, water, and steam.


Names: Viton®Fluorel®

Compound Info

ASTM D1418 DesignationFKM
ASTM D2000/SAE J200 Type, ClassHK
Hardness (Shore A)55-90

Thermal Properties

Standard Min Temp.-13°F (-25°C)
Standard Max Temp.446°F (230°C)
Special Min Temp.-40°F (-40°C)
Special Max Temp.446°F (230°C)
Made With Viton Logo

Chemical Resistance

Mineral oil and grease, low swelling in ASTM oil No. 1, and IRM 902 and IRM 903 oils
Phosphate esters
Non-flammable hydraulic fuels in the group HFDEngine oils Silicone oil and grease
Mineral/vegetable oil and grease
Aliphatic hydrocarbons (fuel, butane, propane, natural gas)
Aromatic hydrocarbons (benzene, toluene)
Chlorinated hydrocarbons (trichlorethylene and carbon tetrachloride)
Fuels, also fuels with methanol content

NOT Compatible

Glycol based brake fluids, Ammonia gas amines, alkalis, Superheated steam, Low molecular organic acids (fomic and acetic acids)

Disclaimer: These are general guidelines only. All materials should be tested in your application.


Flurocarbon Compound

Available Specifications

Key Characteristics

Avg. Temp Ranges



ASTM D2000

Available in black or brown. Excellent resistance to head and a wide range of chemicals.

5° to 446°F


AMS 7276, M83248/1
Mil-R-83248 CL 1
Dwg AS3208, AS3209

Meets AMS7276. Excellent resistance to heat, engine oils and lubricants, ozone and weathering. Low compression set and good 
fuel resistance.

-13° to 392°F


AMS 7259, M83248/2
Mil-R-83248 CL 2
Dwg AS3581

Meets AMS7259. Similar to AMS 7276 above except in 90-durometer hardness.

-13° to 392°F

GLT Type

M84385/1, AMS-R-83485

Meets AMS-R-83485. Excellent heat resistance and low temperature performance. 
GLT Type Viton.

-35° to 400°F

GFLT Viton

ASTM D2000 / SAE J200
M7HK 710 A1-10 B38
EF31 Z1 Z2 Z3

GFLT based FKM. Good for low temp with 
improved chemical resistance. Listed for 
fuel/alcohol applications.

-31° to 392°F

FDA Viton

ASTM D2000 / SAE J200
M2HK 710 A1-10 B37
B38 EF31 F15 Z

FDA, USDA, and NSF grades available.

-4° to 392°F

Viton Extreme (ETP)

Extreme chemical service. Strong bases and amines. Peroxide cured.

-4° to 392°F

Viton V71C

Low Temperature applications. Low compression set with good elongation properties.

-60° to 437°F

Viton V91A

Low Temperature applications. Explosive decompression resistant.

-51° to 437°F



Viton A – General Properties

Offers a broad range of resistance to oils, fuels, lubricants and most mineral oils. Very good resistance to many aliphatic  hydrocarbon fluids that act as solvents for many other rubbers. Exceptionally good resistance even at temperatures that can stiffen other non-fluorinated elastomers. Viton® A is resistant to atmospheric oxidation, sun, weather, and has excellent resistance to fungus and mold.

Available Compounds:

  • Viton® A offers good fluid resistance at a very affordable price.
  • Viton® GLT Peroxide curable offering low temperature flexibility -40°C (-40°F).

Download the Viton® A Datasheet [PDF]

Chemical Resistance


66% Flourine


Viton B – General Properties

Viton® B has better resistance and retains flexibility better after dry heat aging than Viton® A. It is recommended with good mechanical properties. Viton® B is specified by the Fluid Sealing Association to resist sulfur dioxide in power generating factory systems. Viton® B offers superior resistance to both diluted and concentrated aggressive acids, and various mineral acids including: Sulfuric Acid, Nitric Acid, and Hydrochloric Acid.

Available Compounds:

  • Viton® B offers better overall fluid resistance than Viton A, with economical pricing.
  • Viton® GB Peroxide curable offering better a compression set.
  • Viton® GBLT Peroxide curable offering low temperature flexibility -40°C (-40°F).

Download the Viton® B Datasheet [PDF]

Chemical Resistance


68% Flourine


Viton F – General Properties 

The “F” family of Viton® was designed for today’s oxyengated fuels, modern lubricants, and blended chemicals. As new chemicals and fuels are developed, new technology in Viton  has led to the development of the Viton® F family of sealing products. Viton® F offers excellent resistance to fluids that Viton® A and B types cannot adequately resist. Viton® F types are highly resistant to oxygenated fuels containing (MeOH, EtOH, MTBE), engine lubricants (SE-SF and SG-SH grades), aromatic hydrocarbon process fluids, chemicals and conentrated mineral acids.

Available Compounds:

  • Viton® B (with Bisphenol cure). Viton® F offers the best fluid resistance at a very affordable price.
  • Viton® GF Peroxide curable offering resistance to Aqueous Fluids: Water, Steam and Mineral Acids. (H2SO4, HNO3, HCL, etc.)
  • Viton® GFLT Peroxide Curable offering exceptional chemical resistance and maintains flexibility in low temperature applications -40°C (-40°F).

Download the Viton® F Datasheet [PDF]

Chemical Resistance


70% Flourine


General Properties

Viton ® Extreme offers more universal chemical resistance than either standard grades of Viton ® or TFE/P (Aflas) Elastomers. Viton ® Extreme was originally develolped to resist Sour (H2S) petroleum environments that are commonly found in the oil field. However, it has become widely used in the Chemical Processing, Pertoleum Refining, Semiconductor and Chemical Transportation industry.

Today’s blended fuels with additives and oxygenates such as MTBE, TAME, ETBE and alcohols offer difficult sealing solutions that Viton® Extreme can solve without the cost of high performance perfluoroelastomers (Kalrez).

Available Compounds:

  • Viton ® ETP Cost-effective replacement for perfluoroelastomers like Kalrez, Chemraz, and Simriz

Download the Viton® Extreme Datasheet [PDF]


Viton ® Sponge resists the corrosive attack of a wide variety of chemicals and fluids. It delivers superior protection against oils, fuels, lubricants, most mineral acids, and fire-resistant hydraulic fluids. It performs well in many aliphatic and aromatic hydrocarbons (carbon tetrachloride, benzene, toluene, xylene) that act as degrading solvents for other rubbers.

Available thicknesses:
1/8”   1/4”   3/8”   1/2”

Viton ® Sponge plays a particularly vital role in cases where soft flouroelastomers are desirable. The practical low hardness limit for solid Viton ® is 55 durometer. Viton ® Sponge fills this void where softer material is required, yet the heat and fluid resistance of solid Viton ® is necessary.

Additional advantages of Viton ® Sponge over conventional elastomeric sponges include: low temperature flexibility, high resistance to ozone attack, and low moisture absorption.

The operational temperature range of Viton® Sponge is -10°F to +400°F. At high temperatures, Viton ® Sponge resists heat and simultaneously retains its good mechanical properties.

Download the Viton® Sponge Rubber Sheet Datasheet as PDF

InfoEach thickness comes in a variety of sheet sizes and can even be cut to customer specific sizes. Contact us and ask about Viton Sponge Rubber sheet sizes.  


Viton Diaphragm sheet is manufactured with high quality Viton rubber compounds designed for long service. This fluorocarbon rubber sheet is reinforced with Nylon, Nomex, or Fiberglass fabric to provide strength.

Recommended use for control valves, regulators, pumps etc. Typically available in one ply of fabric, multiple plies can be used for high pressures, and more demanding applications.

Download the Viton® Diaphragm Datasheet [PDF]