Our Manila Copal Resin is graded PWS. It comes in the form of lumps of pure resin approx. 1/4" to 1" in diameter. Copal resin is soluble in alcohol and ketone solvents. It is not soluble in hydrocarbons and esters. It has a softening point of 178-194°F and has a refractive index of 1.538-1.540.