Carboxylated Nitrile(XNBR)

Cabboxylated Nitrile is similar to Nitrile rubber, but the polymer backbone has been chemically modified with Carboxylic Acid containing group. This result is XNBR with more excellent abrasion and tear resistance than traditional NBR. For this reason, XNBR based parts are usually applied in dynamic assembly such as seals and rod wipers.

Cure system - Sulfur-Cured
Standard XNBR compounds are sulfur-cured.

General Information

ASTM D 1418 Designation: XNBR
ISO/DIN 1629 Designation: XNBR
ASTM D2000 / SAE J 200 Codes: BG, BK, CH
Standard Color(s): Black
Hardness Range: 50 to 90 Shore A
Relative Cost: Low

Service Temperatures

Standard Low Temperature: -20°C / -4°F
Standard High Temperature: 100°C / 212°F
Special Compound High Temperature: 125°C / 257°F

Performs Well In...

Doesn't Perform Well In..

  • Aliphatic hydrocarbon
  • Vegetable and mineral oils and greases
  • Diesel
  • Water
  • Dilute acids, alkali and salt solutions
  • Aromatic hydrocarbon
  • Chlorinated hydrocarbon
  • Ketones
  • Acetic acid
  • Ethylene ester
  • Strong acids
  • Brake fluid with glycol base