- Crude glycerine is the impure form of refined glycerine and primarily made as a by-product of soap and ester. - The crude glycerine is guaranteed to have a minimum of 80% purity and is of vegetable origin. Crude Glycerine can be refined up to 99.5% Purity using the distillation process where it is condensed at high temperature and pressure. - Crude Glycerine is more often used for industrial purposes.