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Cyclomethicone
(C2H6OSi)n Cyclopolydimethylsiloxane;
 Cyclic polydimethylsiloxanes;
 Cyclodimethicone [69430-24-6]

DEFINITION

Cyclomethicone is a fully methylated cyclic siloxane containing repeating units of [−(CH3)2SiO−]n, in which n is 4, 5, 6, or a mixture of them. It contains NLT 98.0% of (C2H6OSi)n, calculated as the sum of cyclomethicone 4, cyclomethicone 5, and cyclomethicone 6, and NLT 95.0% and NMT 105.0% of the labeled amount of any one or more of the individual cyclomethicone components.

USP REFERENCE STANDARDS FOR PURCHASE

USP Cyclomethicone 4 RS
USP Cyclomethicone 5 RS
USP Cyclomethicone 6 RS
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