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PVC plastic (pvc plasticizer) formula is usually composed of PVC resin and additives.  According to their function, additives are including plasticizer, heat stabilizer, lubricant, processing modifier, impact modifier, filler, anti oxygen, UV absorber, colorant, foaming agent, etc..

 PVC Plasticizer

You’d better to have knowledge about characters of PVC resin and different additives before designing the formula.  The common PVC plastic(pvc plasticizer) formula is consist of 100 parts PVC powder, 30-100 parts plasticizer, 0-400 parts filler, 0-10 parts aids, 0-5 parts pigment, 0-10 parts lubricant, 1-2 parts stabilizer.