Nitrile

Chemical Name: Acrylonitrile-butadiene

Common Names: Buna-N

ASTM D1418: NBR

ASTM D2000 / SAE J200: BF, BG, BK, CH

ISO/DIN 1629: NBR

Nitrile is the most popular material with good price.

It is a polymer made of butadiene and acrylonitrile. The acrylonitrile content can be between 18 and 50% and it influences the following properties of the NBR sealing materials manufactured of it:

— swelling resistance in mineral oils, greases and fuels

— elasticity

— cold flexibility

— gas permeability

— compression set.

Temperature range

-40°C ~ 100°C / -40°F ~ 212°F

Transient up to 120 °C / 250°F

Good resistance in

Aliphatic hydro-carbons, e.g. propane, butane, petrol, mineral oils (lubricating oils, hydraulic oils of groups H, H-L and H-LP) and mineral-oil-based grease, flame retardant hydraulic fluids of the HFA, HFB and Group HFCs, plant and animal-based oils and greases, light heating oil, diesel fuel.

Average resistance in

Fuels with high aromatic content (super fuels) 

Not resistance in

Aromatic hydro-carbons, e.g. benzene, chlorinated hydro-carbons, e.g. trichlorethylene, flame retardant hydraulic fluids of the Group HFD, esters, polar solvents as well as in brake fluids on a glycol ether base.