Glycerin is a colorless sweet clear viscous liquid. No smell. Warm and sweet. The national standard is called glycerol, can absorbmoisture from the air, also can absorb hydrogen sulfide, sulfur dioxide and hydrogen cyanide. Soluble in benzene, chloroform, carbon tetrachloride, carbon disulfide, petroleum ether and oil. Relative density 1.26362. Melting point 17.8. Boiling point 290 C(decomposition). The refractive index of 1.4746. Flash point (open cup) 176 C. Acute toxicity: mg/kg LD50:31500 (rat)

Item	Index
Appearance	Colorless clear syrupy liquid, aqueous solution (1 → 10) shows neutral reaction
Relative Density	not less than 1.2569 at 25ºC
[Identification]
(1)	Should be positive reaction
(2)	its infrared absorption spectrum should be consistent with that of sample
[Inspection]
Color	Not darker than comparison solution
Chloride	Not darker than comparison solution (0.0015%)
Sulfate	Not darker than comparison solution(0.002%)
Fatty acids and esters	Consumption of sodium hydroxide solution (0.1mol / l) should not more than 4.0ml
Acrolein, glucose and ammonium salt	May not yellow or occur ammonia smell
Readily carbonizable substance	Not darker than comparison solution
Residue on ignition	1.2598
Ferric salt	Not darker than comparison solution(0.0002%)
Heavy metals	Not more than two percent
[Content Determination]	C3H8O3 not less than 95.0%

In medicine, used to extract a variety of preparations, solvents, hygroscopic agents, antifreezes, sweeteners and produce topical ointment or suppository, also used extensively for the production of pharmaceutical intermediates.