Polyethylene Glycol 20000
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
CAS RN®: 25322-68-3.-Molecular weight range: 15,000-20,000. Hard, white, waxy solid, usually supplied in flake form. Soluble in water with subsequent gel formation.
VISCOSITY-CAPILLARY METHODS (911), Viscosity of 25% solution: Add 50.0 g of test specimen to a 250-mL wide-mouth, screw-cap jar containing 150.0 g of water. Attach the cap securely to the jar, and roll on a mechanical roller until the test specimen is completely dissolved, in 2 to 4 hours. Allow the solution to stand until all air bubbles have disappeared. Another 2 to 4 hours may be required. Adjust the temperature of the solution to 37.8 ± 0.1°, and determine the kinematic viscosity on a suitable viscometer of the Ubbelohde type. The viscosity is not less than 100 centistokes.
pH (791): between 6.5 and 8.0 in a solution (1 in 20).
[NOTE-A five-fold dilution of the test solution prepared for the Viscosity of 25% Solution test may be used.]
RESIDUE ON IGNITION (281): not more than 0.7%, the use of sulfuric acid being omitted.
