Ester Gum HS Rosin ester Arakawa Chemical Tackifier >> Rosin ester ADHESIVE >> Hot-melt ADHESIVE >> Hot-melt >> Pressure sensitive (HMPSA) Rosin ester ESTER GUM HS Good compatibility with natural & synthetic elastomer Pressure sensitive adhesive Hot adhesive Rosin ester. Used as a tackifier in hot melt and pressure sensitive adhesives. Offers good compatibility with natural and synthetic elastomers.