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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

Fluorocarbon (FKM)

Fluorocarbon has excellent resistance to high tem¬peratures, ozone, oxygen, mineral oil, synthetic hydraulic fluids, fuels, aromatics and many organic solvents and chemicals. Low temperature resistance is normally not favorable and for static applications is limited to approxi¬mately -26°C (-15°F) although in certain situations it is suitable down to -40°C (-40°F). Under dynamic conditions, the lowest service temperature is between -15°C and -18°C (5°F and 0°F).

Gas permeability is very low and similar to that of butyl rubber. Special FKM compounds exhibit an improved resistance to acids, fuels, water and steam.

Heat resistance
• up to 204°C (400°F) and higher temperatures with shorter life expectancy

Cold flexibility
• Down to -26°C (-15°F) (some to -40°C) (-40°F)

Chemical resistance
• Mineral oil and grease, low swelling in ASTM oil No. 1, and IRM 902 and IRM 903 oils
• Non-flammable hydraulic fuels in the group HFD
• Silicone oil and grease
• Mineral and vegetable oil and grease
• Aliphatic hydrocarbons (fuel, butane, propane, natural gas)
• Aromatic hydrocarbons (benzene, toluene)
• Chlorinated hydrocarbons (trichlorethylene and car¬bon tetrachloride)
• Fuels, also fuels with methanol content
• High vacuum
• Very good ozone, weather and aging resistance

Not compatible with
• Glycol based brake fluids
• Ammonia gas, amines, alkalis
• Superheated steam




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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