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H-Seal (Metal Seal)
Custom Metal Fabrication

Bostec's revolutionary H-Seal are the most reliable, flexible and cost effective metal seals in existence. H-Seal™ provide an ultra high vacuum (UHV) seal that is particle free, impermeable to moisture and are interchangeable with elastomeric O-rings. Learn more about H-Seal ...

Guaranteed 100% reliable
Interchangeable with Elastomeric O-Rings
Cryogenic to 500+° C
Sizes from 0.300" to 14"
Available in Nickel, Aluminum, Copper


All Seals Incorporated
The Sealing Specialists
2110 S. Yale Street
Santa Ana, CA 92704
Phone: (714) 556-4931
Fax: (714) 557-3257

SEALS › O-Rings

Chlorosulfonated Polyethylene (CSM)

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

Heat resistance
• up to 121°C (250°F)

Cold flexibility
• down to approximately -29°C (-20°F)

Chemical resistance
• Many acids
• Many oxidizing media
• Silicone oil and grease
• Water and water solvents
• Ozone, aging and weathering resistance

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 and IRM 903 oils)
• Polar solvents (acetone, methyl ether, ketone, ethyl acetate, diethyl ether, dioxane)
• Phosphate-ester based fluids

Not compatible with
• Aromatic hydrocarbons (benzene)
• Chlorinated hydrocarbons (trichloroethylene)



For immediate assistance - Call 800-553-5054
We can supply custom molded o-ring designs in any material and in virtually any shape or size. Send your drawings for quote or call to discuss product or material design perimeters with our engineering department.


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