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