PROPELLANTS IN AEROSOLS 535 0 $8• • • o o 0 0 -- o o o o o o o o • •o • o 0 C ----' • 0 0

536 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Figure 9. Collection of effluent in 10-cm gas cell ( lass Aerosols Product in glass aerosols must be transferred to a conventional metal can before being subjected to the previously described method. This was readily accomplished by attaching a can piercer to an empty crimped aerosol can, evacuating with a pump through the piercing device, then transferring from the glass aerosol to the metal can with a plastic transfer button.* The authors have worked with metal cans down to l-oz. net capacity. In some cases, it may be necessary to warm the glass aerosol or cool the metal can to effect transfer of sufficient sample. This method will be subject to some error when the glass aerosol has a vapor tap valve--the magnitude of error depends mainly on the size of the vapor tap. When working with known s 3 stems the error may be determined experimentally and a correction made. * Precision Valve Corp., Yonkers, N.Y.