Pontianac

A firm of manufacturers to whom a sample of the Galactodendron latex was submitted considered that the material could be used in the rubber industry as a substitute for pontianac.

Some fifteen years ago enterprising technologists found that the rubber in pontianac was a very satisfactory material from the commercial standpoint, so much so that its extraction from the pontianac by deresination would be commercially sound, in view of the then obtaining price of crude rubber, provided an efficient method of extraction could be developed.

Glycerol, partially esterified with abietic acid is preferred although glycerol, etc., esterified with rosin, Congo, manila, the pontianacs, the shellacs, kauri, copal or other fossil resins may be used.

If the acetone extract is brittle, the presence of a resin is indicated. It may be either rosin, coumarone resin or pontianac resin.