Chemical Process
Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils

Have affinity to retain harmful sulphur compounds
Always contain some amount of nickel (as their complete removal is very difficult)
Are prone to rancid oxidation
Cause cholesterol build up and blood clotting

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Chemical Process
Vulcanisation of rubber

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

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