... gum rosin by hydrogenation. Pentaerythritol Rosin Ester (PR-100S) is a light-colored pentaerythritol rosin ester of stabilized gum rosin by hydrogenation ... : aromatic and aliphatic hydrocarbon solvents (petroleum benzine, mineral spirit, benzene, ethyl acetate, acetone), esters, ketones and chlorinated solvents. Insoluble in: alcohol ...