Natural Rubber (NR)

Natural rubber is produced from the latex of the Hevea brasiliensis,and the chemical name of this polymer is polyisoprene. Polyisoprene also can be synthesized by polymerization from its monomer isoprene. Natural rubber possesses many excellent physical properties including high resilience and strength and good abrasion resistance. The defects are like SBR, having poor resistance to hydrocarbon oil and not suitable in UV, oxygen, ozone because of the double bond in the polymer backbone. But its poor weathering resistance can be modified by special additive.

Cure system

Standard NR compounds are sulfur-cured.

Other Common Variations

  • NR is usually mixed with SBR and BR and applied in tire productions.

General Information

ASTM D 1418 Designation
Standard Color(s)
ISO/DIN 1629 Designation
Hardness Range
40-90 Shore A
ASTM D2000 / SAE J 200 Codes
Relative Cost

Service Temperatures

Standard Low Temperature
-50°C / -58°F
Special Compound Low Temperature
Standard High Temperature
70°C / 158°F
Special Compound High Temperature

Performs Well In...

  • Alcohols
  • Organic acids

Doesn’t Perform Well In...

  • Ozone
  • Petroleum oils
  • Aromatic, aliphatic, or halogenated hydrocarbons