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Technical Data Sheet
Butvar® B-72



Product Description
Butvar® B-72 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.

Typical Properties

PropertyTypical Value, Units
General
Hydroxyl Contentb17.5-20.0
Solution Viscosity 
     7.5% solids in anhydrous methanol @ 20°C170-260 cps
Volatile Content3.5 % max
FormWhite, free-flowing powder
Acetate Contentd2.5 maximum
Butyryl Contentc80 (approximate)
Molecular Weighta170,000-250,000
Specific Gravity 
     @ 23°/23°C1.100
Glass Transition Temperature (Tg)72-78 °C

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




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