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Synthetic cis-polyisoprene (IR)

The rubber:Is basically the same polymer as natural rubber – but made synthetically.
Resistance and properties:

Synthetic cis-polyisoprene has a high tear, pull and abrasion resistance. The aging properties of this synthetic alternative are better in comparison to natural rubber and also the machine-ability of cis-polyisoprene is better. Temperature resistance is also considerably better in comparison to natural rubber.

Downsides:

Despite the synthetic composition, this rubber is mechanically weaker in comparison to natural rubber, because it is not 1--% the cis-isomer. The ageing and weather properties are poor. Cis-polyisoprene also has poor resistance to mineral oils.

Applications:

This rubber is used in the tyre industry and shock isolators.