Sylvaros PR R-85 Dimerized rosin Arizona Chemical Natural Resins & Gum >> Rosin Coatings SYLVAROS® PR R-85 is a polymerized rosin with unique properties that enable it to totally or partially replace gum or modified rosins for improved properties. SYLVAROS PR R-85 has compatibility and solubility features which allow it to be used in a variety of adhesive, coating and compounding applications. Good Compatibility High Acid Number surfaces Flaked Form Improved strength properties in adhesives Good adhesion to difficult-to-bond Ease of handling High acid number, polymerized rosin. Used in a variety of coating applications. Possesses compatibility and solubility features. Offers improved strength properties, good adhesion to difficult-to-bond and ease of handling.