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• <br />J <br />1,1,1 -Trichloroethane (1,1,1 -TCA) (Methyl Chloroform) <br />1,1,1 -TCA is a colorless liquid with a mild odor, like chloroform. <br />Short-term exposure to 1,1,1 -TCA vapor may cause headaches, <br />dizziness, drowsiness, unconsciousness, irregular heart beat, and <br />death. 1,1,1 -TCA liquid splashed in the -eye may cause irritation. <br />The PEL for 1,1,1 -TCA is 350 ppm in air. <br />55 <br />