Lubricants stabilisers, general

Emulsion polymer isolation gives polymers in the shape of tiny hollow spheres called cenospheres. The pure polymers are rarely used. They are generally compounded with a variety of additives such as fillers, plasticisers, lubricants, pigments and stabilisers to provide a variety of materials with differing physical, chemical and electric properties. 

The earliest piston engines used either mineral or vegetable oil lubricants and in many cases it is now difficult to find out which was preferred. By 1919 the situation had generally stabilised castor oil was always used for rotary engines but mineral oil was widely used in other engines while some engines could use either [4]. 

The factors to consider when PVC is used for general pharmaceutical applications include plasticisers, stabilisers, modifiers, monomer residues, regrind, lubricants, catalytic residues and chain length. 

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