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PVC is a relatively stiff flow material and has a narrow processing range. Otherwise, severe problems from decomposition (which produces hydrochloric acid which in turn accelerates decomposition) can occur. Process the material at the correct melt temperature. It is not resistant to concentrated oxidizing acids such as sulfuric or nitric acid, and is unsuitable for use with aromatic and chlorinated hydrocarbons. However, unplasticized PVC is not recommended for environmental and continuous use above 60 C. PVC is highly resistant to oxidizing and reducing agents, and strong acids. The features of PVC include low combustibility, toughness (designed to be unbreakable), good weatherability (color and impact retention and no loss in stiffness), and excellent dimensional stability.

The additives used include stabilizers, lubricants, processing aids, pigments, impact modifiers, and fillers. PVC is substantially an amorphous material. PVC grades produced by suspension or mass polymerization techniques are the major types used for melt processing. Additives are mixed with PVC to make it processible. The repeat chemical structure is vinyl chloride. Rigid (unplasticized) PVC, which is produced from sodium chloride and natural gas, is one of the most widely used plastic materials.

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