PER 90 Pentaerythrite ester of gum rosin Wuzhou Sun Shine Tackifier >> Rosin ester >> Penthaerythritol (penta) ester ADHESIVE >> Hot-melt ADHESIVE >> Hot-melt >> Pressure sensitive (HMPSA) Pentaerythrite Ester of Gum Rosin PER-90 Pentaerythrite ester of gum rosin are made from gum rosin or refined gum rosin through esterification with pentaerythitol Use in hot melt adhesive, pressure -sensitive adhesives and coatings Pentaerythrite ester of gum rosin. Used as a tackifier in hot melt and pressure sensitive adhesives.