Propylene Carbonate USP NF Grade
4-Methyl-1,3-dioxolan-2-one.
Cyclic propylene carbonate [CAS 108-32-7].
Propylene Carbonate contains not less than 99.0 percent and not more than 100.5 percent of C4H6O3.
Packaging and storage: Preserve in tight containers.
Identification: Infrared Absorption.
Specific gravity: between 1.203 and 1.210 at 20C.
pH: Gently but thoroughly mix 10 mL with 0.3 mL of saturated potassium chloride solution in a 100-mL borosilicate volumetric flask. Dilute with carbon dioxide-free water having a pH of 7.0
± 0.5 to volume. Completely purge the solution by vigorous nitrogen bubbling, and continue the bubbling during the pH measurement. Determine the pH potentiometrically when the reading stabilizes:
it is between 6.0 and 7.5.
Residue on ignition: not more than 0.01%.
