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 - Sulfur-Cured
Standard NR compounds are sulfur-cured.
Other Common Variations
• NR is usually mixed with SBR and BR and applied in tire productions.
ASTM D 1418 Designation: NR
ISO/DIN 1629 Designation: NR
ASTM D2000 / SAE J 200 Codes: AA
Standard Color(s): Black
Hardness Range: 40 to 90 Shore A
Relative Cost: Low
Standard Low Temperature: -50°C / -58°F
Standard High Temperature: 70°C / 158°F
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