Glycerol ester of wood rosin is produced by the esterification from wood rosin and glycerol. There are two manufacturing processes for the purification of the wood rosin ester, depending on the purpose of uses, purified by steam stripping when used in chewing gum, or purified by counter-current steam distillation if used in adjusting the density of citrus oils for beverages.
A solid resin extracted from aged pine stumps, it can be refined by removing volatile terpene fractions and impurities before the esterification with glycerol.
Components
It consists of approx. 90% resin acids (mainly of abietic acid) and 10% neutrals (non-acidic compounds).
Natural source
Wood rosin can be either sourced from Pinus palustris (longleaf pine) and Pinus Elliottii (slash pine) stumps. It is different with gum rosin, which is an exudate of living pine trees, has a similar component with wood gum; also different with tall oil rosin, which is a by-product of kraft (paper) pulp processing.
ModelGlycerol Ester of Gum RosinGlycerol Ester of Hydrogenated Rosin
Solubility (with toluene 1:1)Pass the testPass the test
Colour (Iron and Cobalt)85
Acid value, mgKOH/g99
Softening point (globe method),℃80~9080~90
Total arsenic (in As),(mg/kg)1.01.0
Heavy metals (in lead),(mg/kg)10.010.0
Ash, g./100g0.10.1
Relative density, d25℃/25℃1.060~1.0901.060~1.090
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