A rubbery substance derived from the latex of any of several tropical trees of the genera Palaquium and Payena, used as an electrical insulator, as a waterproofing compound, and in golf balls.

• 古塔胶从某些胶木属和巴耶榄属热带树的乳胶中提练出的橡胶物质，用作电绝缘体，防水复合物或做高尔夫球