374 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Table I Aerosol Container/Aerosol Valve Designation Letter Designation a. Continental Can Co. 202 X 214 aerosol container with a Risdon Manufacturing Co. 6422 valve b. Continental Can Co. 202 X 214 aerosol container with an Aerosol Research Co. KN-38 valve c. National Can Corp. 202 X 214 aerosol container with a Risdon Manufacturing Co. 6422 valve d. National Can Corp. 202 X 214 aerosol container with an Aerosol Research Co. KN-38 valve Numerical Designation +0 +100 +200 +300 +400 +500 +600 1-10 b d c a d c 11-20 c a d b c b 21-30 a b a c a c 31-40 d c b a b b 41-50 d d a b c d 51-60 a a d d b a 61-70 c d c a d b a 71-80 b c b d a c 81-90 c a c b d d 91-100 b b d c a a a Aerosol units //561 through //570 are Continental Can Co. 202 X 214 aerosol containers with an Aerosol Research Co. KN-38 valve. undertaken in which a Kartridg Pak Single Station Undercap Filler* was evaluated. The program was divided into the following studies: 1. The effects of variables on propellant fill. The variables in- cluded aerosol containers, aerosol valves, undercap propellant line pres- sures, fill rates, and times of day. 2. The fill tolerances for Propellant 142b/11• (50:50) systems. The fill tolerances, range, and standard deviation were determined for fill levels from 10 g to 115 g. 3. The fill tolerances for Propellant 12t systems at propellant fill levels found in published cosmetic and pharmaceutical formulas, ranging from 20 to 80 g. In addition, an extremely low level of a 5-g fill was also studied. * Kartridg Pak Co., 807 W. Kimberly Road, Davenport, Iowa. t Allied Chemical, Industrial Chemicals Division, P. O. Box 70, Morristown, N.J. 07960.

UNDERCAP FILLER FOR AEROSOLS Table II Experimental Schedule 375 Day Volumetric Propcllant Cylinder Line Pres- Size (cm a) am or pm sure (psig) Filling Rates (Aerosol Units per Minute) Aerosol Unit Numerical Designation Tuesday 1 550 am 900 2 1 550 am 900 4 1 550 am 500 4 i 550 am 500 2 I 550 pm 500 4 I 550 pm 500 2 i 550 pm 900 2 I 550 pm 900 4 Thursday 2 100 am 500 4 2 100 anl 500 2 2 100 am 900 2 2 100 am 900 4 2 100 pm 900 2 2 100 pm 900 4 2 100 pm 500 4 2 100 pm 500 2 1-40 41-80 81-120 121-160 161-200 201-240 241-289 281-320 321-360 361-400 401-440 441-480 481-520 521-560 561-600 601-640 EXPERIMENTAL Equipment and Materials The following were used in the studies described below: Kartridg Pak Single Station Undercap Filler (Model 92,9) Sauter-Toppan Scales* General Electric 265 Time Sharing Computert Marchant Desk Calculator:• Propellant 142b/11 (50:50) and Propellant 12 202 X 214 aerosol containersõ 6422 valveI[ and KN-38 valve * Type MDT 160/0.001 and Type S 1600/0.1, August Sauter KG, Ebingen, W. Germany. t General Electric Co., Bethesda, Md. :• Model SKA, SCM Corp., Oakland, Calif. 94(300. õ Continental Can Co., (333 Third Ave., New York, N.Y., 10017, and National Can Corp., 5959 S. Cicero Ave., Chicago, Ill. (30(338. l[ Risdon Manufacturing Co., P. O. Box 520, Naugatuck, Conn. 07331. ô Aerosol Research Co., 7400 W. Cermak Rd., North Riverside. Ill. (3054(3.