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J. Soc. Cosmet. Chem., 23, 115-124 (February 3, 1972) Gas Chromatographic Determination of Methylene Chloride in Aerosol Hair Sprays ROBERT SCHUBERT, B.S., • and LOUISE KETELt Presented May 25, 1971, Seminar, Washington, D.C. Synopsis--An inexpensive SAMPLING DEVICE constructed of an aerosol transfer button, a small piece of polyethylene tubing, and a hypodermic needle is used to transfer a sample of HAIR SPRAY into a stoppered serum bottle. The liquid sample is injected into the GAS CHROMATOGRAPH (gc) with a commercially available high-pressure liquid sampling syringe. A three-segqnent series gc colmnn separates the propellants, solvents, and internal standard in less than 10 minutes. Thermal conductivity is the mode of detection used. The reproducibility of the method when used in analyzing commercial samples con- taining 7-8% METHYLENE CHLORIDE is shown to be better than +2% relative. De- tector response of methylene chloride to the internal standard is linear from 3 to 20% methylene chloride in the sample. INTRODUCTION Hair spray formulations incorporating methylene chloride as a vapor pressure depressant with fluorinated hydrocarbons are being ad- vocated because of reduced costs (1). It is desirable that an analytical method be available to determine methylene chloride in hair sprays di- rectly in a minimum time. It is also advantageous if the method is si•nple, relatively inexpensive to perform, and quick, particularly if it is to be used as a quality control tool. It must also be accurate and repro- ducible. * The Gillette Company, Personal Care Division, Merchandise Mart, Chicago, Ill. 60654. ? 3950 Lake Shore Drive, Chicago, Ill. 60613. 115