Polyvinyl Chloride: A white, water insoluble, thermoplastic resin (-CH2CHC1-)n derived by the polymerization of vinyl chloride; used chiefly as a coating for phonograph records, in the manufacture of floor coverings and as an insulator for metal pipes and wire.

Definition used with Permission, from
The New Clay : Techniques and Approaches to Jewelry Making
by Nan Roche, Chris Roche (Photographer), Sue Roche (Illustrator), Seymour Bress (Editor)
Paperback - 144 pages Reprint edition (March 1992)
Flower Valley Press, Inc
ISBN: 0962054348