Butvar polyvinyl butyral resins have a combination of properties that make them a key ingredient in a variety of formulations. Some of these properties for which Butvar is widely used are: outstanding binding efficiency, optical clarity, adhesion to a large number of surfaces, and toughness combined with flexibility. Butvar resins generally are soluble in alcohols, glycol ethers and certain mixtures of polar and non-polar solvents.
| Resin Type | Molecular wt. / Solution viscosity in cp |
|---|---|
| B-73 | 90-120 / 1,000-4,000 |
| B-90 | 70-100 / 600-1,200 |
| B-98 | 40-70 / 200-400 |
| *15% by weight |