PARAMETERS

USP 25

STANDARD

SAMPLE

REMARKS

Description

Clear to slightly hazy, colorless or practically colorless, slightly hygroscopic, viscous liquid, having a slight characteristic odor

Specific Gravity

About 1.12 at 25?/span>C

Solubility

Miscible with water, soluble in acetone, 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 free ethylene oxide and 1,4-dioxane

Not more than 10 ug per g of ethylene oxide and not more than 10 ug per g of 1,4-dioxane

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