PARAMETERS

USP

STANDARD

SAMPLE

REMARKS

Description

Practically odourless and tasteless, white, waxy, plastic material having a consistency similar to beeswax, or as creamy white flakes , beads, or powders, the congealing temperature is between 6?to 20?o:p>

Solubility

Freely soluble in water , soluble in acetone, in alcohol, in chloroform, in ethylene glycol monoethyl ether, in ethyl acetate, and in toluene. Insoluble in ether and in hexane?

Completeness and Color of Solution

A solution of 5g of PEG in 50ml of water is colorless and clear

Viscosity <911>

Between 6.8 to 8.0 Centistokes

Average molecular weight

Not less than 95.0% and not more than 105.0%

pH <791>

4.5 - 7.5, in a solution prepared by dissolving 5.0g PEG in 100ml of carbon dioxide-free water and adding 0.3ml of saturated potassium chloride solution

Residue on ignition?<281>

Not more than 0.1 %

Heavy metals <231>

The limit is 5 ppm

Limit of ethylene glycol and diethylene glycol

Not more than 0.25%?of the sum of ethylene glycol and diethylene glycol is found

Organic volatile impurities Method IV <467>

Meets the requirements for chloroform, methylene chloride, and trichloroethylene