Polyvinyl butyral

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A thermoplastic resin made by the condensation of Polyvinyl alcohol with Butyraldehyde. Polyvinyl butyral is a colorless, flexible tough solid. It is used in sheet form as the center adhesive layer in safety glass. It is also used to waterproof textiles. Polyvinyl butyral is weather resistant. See also Butvar.

Synonyms and Related Terms

PVB; poly(vinyl butyral); polivinilbutiral (Esp.); polivinil butirrale (It.); Butvar B73; Butvar B-98; Vinal; polyvinyl acetal; x

Physical and Chemical Properties

  • Soluble in alcohols, acetone, aromatic hydrocarbons.
  • Insoluble in water.
  • Tg = 45-63 C


General Characteristics of Polymers

Physical Properties for Selected Thermoplastic Resins

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 848
  • Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
  • Conservation Materials Ltd., Catalog