Buna-N (also know as Nitrile) is the most widely used seal material for compressed air applications.
Buna-N (also know as Nitrile) is the most widely used seal material for compressed air applications.
Buna-N combines working properties such as high tensile strength, high abrasion and tear resistance, and low compression set with a broad temperature range, and excellent resistance to petroleum-based compounds.
Buna-N is comprised of the copolymer butadiene and acrylonitrile. By varying the proportions of the two components, compounds of different characteristics are created.
Increasing the proportion of acrylonitrile gives the compound a higher resistance to petroleum-based fluids and heat, but reduces it’s low temperature performance.
Increasing the proportion of butadiene creates a compound with better low temperature characteristics. Low-temperature Nitrile compounds are those often required by Air Force-Navy (AN) and Military Standard (MS) o-ring specifications.
Applications
- General compressed air systems
- Low-temperature military use
- Off-road equipment
- Automotive, marine and aircraft fuel systems
- Certain compounds are FDA approved
Compatibility
- Generally recommended for:
- General purpose compressed air systems
- Petroleum
- Water
- Diester
- Water-Glycol
- Not recommended for:
- Applications with direct exposure to sunlight and ozone
- Highly polar solvents such as acetone, MEK, chlorinated hydrocarbons and nitro hydrocarbons
- Halogenated hydrocarbons
- Esters
- Ethers
- Ketones
- Acids
- Brake Fluid
Specifications
- Temperature Range: -40°F to 250°F (dry heat)
- Hardness: 40 – 90 Shore A
- Trade Names:
- Chemigum (Goodyear)
- Hycar (B.F. Goodrich)
- Krynac (Polysar, Ltd.)
- Nysyn (Copolymer Rubber)
- Paracril (Uniroyal)
- Perbunan(Mobay)
- ASTM D1418 Designation: NBR
- ASTM D2000/SAE J200 Type, Class: BF, BG, BK, CH
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