Chemical Process
Vulcanisation of rubber

Increases its oil & solvent resistance
Increases its ozone & oxygen reactivity
Decreases its tensile strength
Converts its plasticity into elasticity

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Chemical Process
Unsaturated oils compared to saturated oils have

Lower melting point & lower reactivity to oxygen
Lower melting point & higher reactivity to oxygen
Higher melting point & higher reactivity to oxygen
Higher melting point & lower reactivity to oxygen

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