Fluororcarbon (FKM)

Description:

Fluorocarbon is a well-known high performance rubber that has excellent resistance to high temperature, ozone, weather, oxygen, mineral oil, fuels, hydraulic fluids, aromatics, and many organic solvents and chemicals.

Viton® fluoroelastomers fall into these different categories:

  • A-TYPE, 66% fluorine
  • B-, GBL-TYPE, 67~68.5% fluorine
  • F-, GF-TYPE,70% fluorine
  • GLT, GFLT
  • Viton® ETP Extreme

Viton® ETP Extreme offers a higher level of resistance to more chemicals and solvents.

Common Uses:

FKM is found in:

  • Chemical processing
  • Aerospace applications
  • Industrial applications
  • O-rings
  • Automotive applications

Properties:

Standard Compound: -26°C (-15°F) to 232°C (450°F)

Special Compound: -40°C (-40°F) to 275°C (525°F)

Hardness: 50 to 90 Shore A

ASTM D1418 Designation: FKM

ASTM D2000 Designation: HK

Standard Colors: Black

Optional Colors:

Production:

Standard FKM compounds are Bisphenol cured. FKM compounds that are peroxide cured possess better resistance to acid solutions, and can replace those that are litharge cured in an acid solution.

Advantages:

FKM rubber compounds perform well in petroleum products, fuels or blends with methanol or ethanol, diesel or blends with biodiesel, mineral oil and grease, silicone oil and grease, high vacuum environments, ozone, strong acids.

Limitations:

FKM rubber compounds are susceptive to amines, ketones, formic and acetic acids, nitro hydrocarbons, superheat steam, low molecular weight esters and ethers, hydrofluoric, chlorosulfonic acids at high heat, Skydrol® fluids, and phosphate ester based hydraulic fluids.

Viton® Product Comparison:

Viton® Product

A

AL

B

F

GAL-S

GBL-S

GF-S

GLT-S

GBLT-S

GFLT-S

TBR-S

ETP-S

Curing System

bisphenol

bisphenol

bisphenol

bisphenol

peroxide

peroxide

peroxide

peroxide

peroxide

peroxide

bisphenol

peroxide

Fluorine Content

66%

66%

68.5%

70%

65.5%

67.5%

70%

64.5%

66%

67%

60%

66%

Heat Resistance

All Viton® products have outstanding thermal properties

Chemical Resistance

Fair

Fair

Good

Very Good

Good

Good

Very Good

Fair

Good

Very Good

Fair

BEST

Base Resistance

Poor

Poor

Poor

Poor

Fair

Fair

Fair

Good

Good

Good

BEST

BEST

Low Temperature Properties

Good

Very Good

Good

Fair

Very Good

Good

Fair

BEST

Very Good

Very Good

Poor

Fair

Compression Set Resistance

BEST

Very Good

Very Good

Good

Very Good

Very Good

Very Good

Very Good

Very Good

Very Good

Good

Good

Relative Cost of Polymer

Low

Low

Low

Low

Low

Low

Low

Medium

Medium

Medium

Low

High

 

 

To learn more about DuPont’s (Now, Chemours’s) Viton®: here
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