Butvar

Description

[Solutia Inc.] A registered trademark for a series polyvinyl butyral resins. Butvars® were first used as the transparent films in the middle of safety glass. They are designed to be transparent, colorless, UV resistant and nonyellowing. In the oxygen free atmosphere of laminated glass, Butvars® age well, but when exposed to UV light in the presence of oxygen, they tend to crosslink and become insoluble. Butvars® come in a wide range of molecular weights. They are used commercially as adhesives, sealants, inks, and coatings to waterproof textiles and wood.

- Butvar® B-72: white solid with softening range= 140-200 C; density= 0.22-0.25

- Butvar® B-73

- Butvar® B-74

- Butvar® B-76

- Butvar® B-79

- Butvar® B-90: white solid with softening range= 140-200 C; density= 0.22-0.25

- Butvar® B-98: white solid with softening range= 140-200 C; density= 0.22-0.25

Synonyms and Related Terms

Butvar B-76; Butvar B-98

Other Properties

Soluble in alcohols, acetone, aromatic hydrocarbons.

Density	1.083
Molecular Weight	Tg = 62-72 C

Hazards and Safety

Talas: Butvar B-76 MSDS

Talas: Butvar B-98 MSDS

Additional Information

° Solutia: Website° C.V.Horie, Materials for Conservation, Architectural Press, division of Butterworth-Heinemann, Oxford, 1997, p.101. ° Krysia E. Spirydowicz, Elizabeth Simpson, Robert A. Blanchette, Arno P. Schniewind, Mauray K. Toutloff, Alison Murray, 'Alvar and Butvar: The Use of Polyvinyl Acetal Resins for the Treatment of the Wooden Artifacts from Gordion, Turkey', JAIC 40(1), 2001.

Authority

• C.V.Horie, Materials for Conservation, Butterworth-Heineman, London, 1997

• G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p.849

• Marie Svoboda, Conservation Survey Index, unpublished, 1997

• Conservation Materials Ltd., Catalog

• Conservation Support Systems, Catalog, 1997