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.