Summaries of the private air pattern outcomes and their statistical evaluation are in Tables 5, 6, 7, and 8. All of the TWA and mean exposures to PERC in these tables had been beneath 25 ppm. Determine 3. Time-weighted average worker exposure to PERC from "fifth generation" dry cleansing machines. Transfer Equipment.-All however one of many each day TWA private samples taken on the switch machine operator and two pressers were beneath 25 ppm. The 2 pressers have been exposed to 5.0 and 2.5 ppm TWA PERC for the complete survey.

Statistical analysis confirmed a major distinction between the operator’s and pressers’ TWA exposures. Almost the entire operator two-hour samples have been beneath 2ppm PERC, and most samples had been under 1 ppm. The operator’s two-hour samples ranged from 3.9 to 42.Three ppm. Dry-to-Dry, Nonvented Tools.-The machine operator, vapedealuk a presser, and vapevente a clothes inspector had been sampled on the shop having two nonvented dry-to-dry machines, and all particular person private samples have been beneath 25 ppm

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Dry-to-Dry, Nonvented with Residual Control.-Figure 3 summarizes private air samples gathered for the 2 dry-to-dry, nonvented machines with residual controls. Of particular significance have been actions associated to loading/unloading the machines, maintenance procedures, pressing operations, Vapefrance spotting, and use of private protective equipment. Figure 2. Five-minute and fifteen minute private exposures to PERC from switch gear. The entire PERC concentrations measured close to the presser’s respiration zone have been at or beneath the restrict of detection, 0.01 mg/sample

>The MicroTIP® was spanned, utilizing 100 ppm isobutylene span gasoline, and calibrated for vapedevice each PERC and mineral spirits, using five standard concentrations of PERC vapor liquidmischen and mineral spirits vapor. Information gathered utilizing the MicroTIP® was electronically recorded on a Rustrak® data logger (Rustrak® Ranger, Gulton, vapevente Inc., East Greenwich, RI) and downloaded to a portable laptop, using Pronto® software

>All of the information gathered were compared to design specs when doable. Data gathered throughout study of the ventilation system was in comparison with recommended values in the literature.

Awkward and sustained postures performed in the course of the pressing operation had been examined to determine whether or not they have been an issue in light of the overall guidelines which might be found in the present literature.