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Technical Data Sheet
Butvar® B-98



Product Description
Butvar® B-98 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 Contenta18.0-20.0
Solution Viscosity 
     6% solids in anhydrous methanol @ 20°C6.0-9.0 cps
Volatile Content5.0 % max
FormWhite, free-flowing powder
Acetate Contentb2.5 maximum
Butyryl Contentc80 (approximate)
Molecular Weightd40,000-70,000
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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