filament 35 000 total denier cellulose acetate filter tow and converted to cigarette filter rods all the finished filter rods contain 8 glycerol triacetate and either 1 2 or 3 of the additives depending on which plasticizer additive mixture is used the filter rods are cut into 21 mm tips and attached to 63 mm tobacco columns from domestic filter cigarettes the assembled cigaretes are conditioned for 48 hours at 60 relative humidity 72 u00b0 f before being smoke tested the cigarettes are smoke tested in accordance with the procedure described in the federal trade commission 39 s report of tar nicotine and carbon monoxide content of the smoke of 187 varieties of cigarettes april 1981 the nicotine content of the smoke is measured by the gas chromatographic procedure described by mumpower and kiefer in tobacco science xi 144 147 1967 additional cigarettes are smoked and the cambridge filter pads collected smoke are slurried in water for subsequent ph measurements the percent tar and nicotine removed by the filters is calculated using the following formulas equ1 a summary of test data is shown in table 2 the test data shows that the filter with 2 and 3 of the additives removes significantly higher amounts of nicotine than tar from the test cigarettes without a measurable effect on the smoke ph smoke ph should not change appreciably due to the filter the control cigarettes contain only triacetin on the filters table 1______________________________________plasticizer additive mixtures______________________________________1 88 glycerol triacetate 12 myvatem 30 dispersing agent2 80 glycerol triacetate 20 myvatem 30 dispersing agent3 70 glycerol triacetate 30 myvatem 30 dispersing agent4.