[Hygienic significance of studying gaseous discharge during production of polyvinylchloride resin items].

Experimental study demonstrated no vinyl chloride (VC) emanation from polyvinyl-chloride (PVC) resins in environment under indoor temperature (20 degrees). VC emanation was detected during resin heating to 50 degrees C and higher, its concentration increasing along with temperature elevation. Total decomposition of resin samples was observed at 140 degrees C. When analyzing VC emanation from stabilizer-containing compositions it was pointed out that VC concentration even at 180 degrees C was significantly lower than in the experiment with PVC resins. VC was not detected in the work zone air during PVC film manufacture where the temperature of mixture heating didn't exceed 140 degrees C. One could greatly reduce and even completely avoid VC emanation into the work zone air by means of heating temperature limitation according to the lowest technological limit and introduction of appropriate quantity of stabilizers into the mixture. The study showed that at the examined production of PVC films, footwear and cable coating VC content was significantly lower than MAC (5 mg/m3). VC wasn't detected in the most of samples presented.