Small-scale smoke toxicity tests were performed on polyvinylchloride-based electrical nonmetallic tubing (PVC/ENT) using the National Bureau of Stan dards (NBS) protocol for nonflaming combustion. An LC 50 of 28.5 mg/L (± 9.25) was determined, placing PVC/ENT smoke in a toxicity category comparable to smoke from wood.
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Packham et al. (1984) studied this question.
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