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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

Hydrogenated Nitrile (HNBR)

Hydrogenated nitrile is a synthetic polymer that results from the hydrogenation of nitrile rubber (NBR). In this process the molecular "double bonds" in the NBR primary polymer chain undergo a hydrogenation process and there¬fore the term "hydrogenated nitrile" (HNBR). The allow¬able temperature range extends to 149°C (300°F) with short periods at higher temperature possible. By following de¬sign guidelines effective sealing can be achieved at -32°C (-25°F) for static applications.

For dynamic applications however, operating temperatures are limited to above - 23°C (-10°F). HNBR compounds possess superior me¬chanical characteristics, particularly their high strength. For sealing applications up to approximately 159°C (300°F), this is an advantage as it prevents extrusion and wear.

Chemical resistance
• Aliphatic hydrocarbons
• Vegetable and animal fats and oils
• HFA, HFB and HFC fluids
• Dilute acids, bases and salt solutions at moderate temperatures
• Water and steam up to 149°C (300°F)
• Ozone, aging and weathering

Not compatible with
• Chlorinated hydrocarbons
• Polar solvents (ketone and ester)
• Strong acids



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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