paper,coatings, inks,rubbers,soaps, electronic industrial products,food grade ester gum,rosin ester resins etc. SpecificationsGum rosin ww grade is made of natural resin, its generalformulais C20H30O20.Gum rosin is made of natural resin, its general formula is C20H30O2.Gum rosin also called colophony, is a solid form of resin obtained from pines and some other plants, mostly conifers, produced by ...