Glycerin, CAS# 56-81-5, Glycerin known as glycerin, pure glycerol is a colorless, odorless, viscous liquid with a sweet taste. Boiling point of 290 , melting point 17.9 , relative density of 1.2613. Infinitely miscible with water, dried over anhydrous glycerin has a strong water absorption.IndexStandardTypeSuper gradeTop gradeFirst gradeSecond gradeChroma20203070Assay99.5 %98.5 %98 %95 %Density (20C )1.2598 gml1.2572gml1.2559gml1.2481 gmlChloride0.001%0.001%0.01%0.05 %Sulfating Ash0.01%0.01%0.01%0.01%Acidity or Alkalinity0.064mmol100g0.064mmol100g0.1mmol100g0.3mmol100gSaponification equivalent0.64mmol100g0.64mmol100g1mmol100g3mmol100gHeavy metals (as Pb)5mgkg5mgkg5mgkg5mgkgAs2mgkg2mgkg2mgkg------------