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Technical Data Sheet
Butvar® B-90



Product Description
Butvar® B-90 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.

Typical Properties

PropertyTypical Value, Units
General
Hydroxyl Contenta18.5-20.5
Solution Viscosity 
     6% solids in anhydrous methanol @ 20°C13.0-17.0 cps
Volatile Content5.0 % max
FormWhite, free-flowing powder
Acetate Contentb2.5 maximum
Butyryl Contentc80 (approximate)
Molecular Weightd70,000-100,000
Specific Gravity 
     @ 23°/23°C1.100
Glass Transition Temperature (Tg)72-78 °C

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




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2/28/2018 11:35:39 AM