Chemical Process
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

Hydrolysis tendency in presence of water
All of these
Greater tendency of decomposition at elevated temperature
Poor oxidation stability and high gum forming tendency

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

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

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Chemical Process
Vulcanisation of rubber

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

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