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Seals Eastern, Inc.
CHEMICAL RESISTANT seals, gaskets, and o-rings
for use in chemical reagents including organic and inorganic acids,
alkalines, ketones, esters, hydrocarbons, alcohols,
fuels, gases, steam, and hot water.

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  When searching for a chemical resistant o-ring, gasket, or seal, the most successful elastomers will be in the class of fluorocarbon rubbers. Several characteristics of  fluorocarbon rubber tend to impart the characteristics necessary for chemical resistance, specifically,
  • the ratio of fluorine to hydrogen,
  • the inherent strength of the carbon-fluorine bond,
  • the absence of carbon bond unsaturation, and
  • the steric hindrance associated with fluorinated structures.
Chemical resistant o-rings, gaskets, and seals for chemical processing industriy for long term service. As a general rule, the higher the fluorine content, the broader the chemical resistance. However, there are exceptions to this rule that can be attributable to the solubility parameter of a given reagent and the elastomer designated to seal the reagent. Consideration must also be given to the curative employed within the fluorocarbon rubber.
The second rule of thumb is that the higher the fluorine content, the more expensive the polymer will be. But again, exceptions exist. For instance, a Type 2 FKM (such as Viton B) possesses a higher Fluorine content than an Aflas FEPM, yet the FKM costs less. Generally speaking, FKMs will be the least expensive fluorocarbon elastomer, followed by FEPM, with the most expensive being FFKM

Good background information on Fluorocarbon Elastomers can be found in our Technical Papers Online page. For information on base resistance you may want to visit our statement about BREs.
ASTM 
D1418
Compound
No.
Shore-A
Hardness
Description
FKM   
Type 1571770Formulated Fluorel . General service.
Type 1714580Formulated Fluorel . Specially for hydrocarbons.
Type 1713090Formulated Fluorel . Specially for hydrocarbons.
Type 1714895Formulated Fluorel . Specially for hydrocarbons; ED resistant
Type 2572260Formulated Viton . General chemical service.
Type 2572375Formulated Viton . General chemical service.
Type 2572485Formulated Viton . General chemical service.
Type 2572595Formulated Viton . General chemical service.
FEPM      
  7265 80 Formulated Viton ETP formulation. Broad chemical resistance. FFKM-type performance.
  7182D 80 Formulated AFLAS . Excellent resistance to steam, acids, bases and other chemical families. Excellent mechanical properties.
  7182X 80 Formulated AFLAS . Excellent resistance to steam, acids, bases and other chemical families. Ultra-low compression set.
  7182B 90 Formulated AFLAS . Excellent resistance to steam, acids, bases and other chemical families. Excellent mechanical properties.
FFKM      
  9291 70 Broad chemical resistance for less cost.
  9295 75 Ultra-high temperature service.
  9294 80 High temperature service; Broad chemical resistance.

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FastDash is a trademark of Seals Eastern, Inc.; OringOnline is a registered trademark of Seals Eastern, Inc.; 7182 is a trademark of Seals Eastern, Inc.; AFLAS is a registered trademark of Asahi Glass Co., Ltd.; Viton is a registered trademark of Dupont Performance Elastomers, LLC.; Fluorel is a registered trademark of 3M.