... the manufacture of adhesive, coating, inks, rubber, soaps, paper e glycerol ester of gum rosin has been general used for ink ... , food grade ester gum, rosin ester resins etc.3. Packing:(1) Drum: Galvanized iron drum, 225kg net each drum.4. Technical ... , the latest specification will be executed and assured by contract. glycerol ester of gum rosin