Hypalon CSM O-Rings & Molded Seals | Seal & Design Inc.

Hypalon CSM

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HypalonThe polyethylene polymer contains additional chlorine and sulfur groups. Chlorine gives the material resistance to flame and mineral oil and also improves the cold flexibility.

Both o-rings and gaskets can be made from Hypalon materials.

Names: Chlorosulfonated Polyethylene, CSM, Hypalon®

Compound Info
ASTM D1418 Designation CSM
ASTM D2000/SAE J200 Type, Class CE
Hardness (Shore A) 45-95
Color black
Thermal Properties
Min Temp. -50°F (-45°C)
Max Temp. 270°F (132°C)


Chemical Resistance
Chemical Resistance
  • Many acids
  • Many oxidizing media
  • Silicone oil and grease
  • Water and water solvents
  • Ozone, aging and weathering resistance
Limited Compatibility
Limited Compatibility
  • Low molecular aliphatic hydrocarbons (propane, butane, fuel)
  • Mineral oil and grease
  • Limited swelling in aliphatic oils (ASTM oil No.1)
  • High swelling in naphthene and aromatic base oils ( IRM 902, IRM 903)
  • Polar solvents (acetone, methyl ether, ketone, ethyl acetate, diethyl ether, dioxane)
  • Phosphate-ester based fluids
Not compatible
NOT compatible
  • Aromatic hydrocarbons (benzene)
  • Chlorinated hydrocarbons (trichloroethylene)

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