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r -I <br />C7 <br />Trichlorofluoromethane (Freon 11 ) <br />Freon. 11 is a nonflammable, colorless Liquid or gas. <br />Short-term exposure to freon 11 may be narcotic at high <br />concentrations. <br />The PEL for freon 11 is 1000 ppm in air. <br />58 <br />