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Technical Data Sheet
Butvar® B-79

Product Description
Butvar® B-79 is a thermoplastic, polyvinyl butyral resin which offers a unique combination of properties for coating or adhesive applications. The use or addition of polyvinyl butyral to a system imparts adhesion, toughness, and flexibility. PVB retains the clarity of the coating and offers reactive hydroxyl sites for crosslinking with thermoset systems. The broad solubility range of Butvar® B-79 allows it to be formulated into many applications.

Typical Properties

PropertyTypical Value, Units
Hydroxyl Contenta11.0-13.5
Solution Viscosity 
     5% solids in SD-29 ethyl alcohol @ 25°C9.0-16.0 cps
Volatile Content5.0 % max
FormWhite, free-flowing powder
Acetate Contentb2.5 maximum
Butyryl Contentc88 (approximate)
Molecular Weightd50,000-80,000
Specific Gravity 
     @ 23°/23°C1.083
Glass Transition Temperature (Tg)62-72 °C

a% Polyvinyl Alcohol
b% Polyvinyl Acetate
c% Polyvinyl Butyral
dSize exclusion chromatography with low angle laser light scattering standard.

Eastman and its marketing affiliates shall not be responsible for the use of this information, or of any product, method, or apparatus mentioned, and you must make your own determination of its suitability and completeness for your own use, for the protection of the environment, and for the health and safety of your employees and purchasers of your products. No warranty is made of the merchantability of fitness of any product, and nothing herein waives any of the Seller's conditions of sale.

2/28/2018 11:35:39 AM