XNBR - Carboxylated nitrile butadiene rubber

Clwyd reference XNBR
ASTM classification XNBR
Typical applications
  • V-belts
  • Shoes
  • Printing rolls
  • Better tensile properties than NBR
  • Higher continuous service temperature
  • Good chemical resistance
  • Improved tear and abrasion properties than NBR
  • Not suitable for brake fluids, ketones, strong acids or phosphate esters
  • Poor resistance to ozone and weathering
  • Higher compression set
Available hardness range (Shore A) 50 - 95
Upper continuous service temp. 125°C
Min. temp. for sealing applications -15°C
Minimum non-brittle  temp.  -30°C
Tensile strength (up to) 25 MPa
Elongation at break (up to) 250%
Price Bracket Very low
ASTM 1 Oil Excellent
ASTM 2 Oil Excellent
ASTM 3 Oil Excellent
Kerosene Excellent
Liquid B Average
Liquid 101 Excellent
Phosphate ester None
Ketone None
Toluene None
Iso-octane Good
Methanol Excellent
Acid (weak) Average
Acid (strong) None
Base (weak) Good
Base (strong) None
Hydrogen sulphide None
Steam None
Ozone Average
Radiation Average