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Heptane 142-82-5 OSHA PEL 400 ppm (1989), 500 ppm (1971) <br /> OSHA STEL 500 ppm (1989), Not established (1971) <br /> ACGIH TLV-TWA 400 ppm <br /> ACGIH TLV-STEL 500 ppm <br /> Mexico TWA 400 ppm (skin) <br /> Mexico STEL 500 ppm (skin) <br /> Hexane 110-54-3 OSHA PEL 50 ppm (1989), 500 ppm (1971) <br /> ACGIH TLV-TWA 50 ppm (skin) <br /> Mexico TWA 100 ppm <br /> Pentane 109-66-0 OSHA PEL 600 ppm (1989), 1000 ppm (1971) <br /> OSHA STEL 750 ppm (1989), Not established (197 1) <br /> ACGIH TLV-TWA 600 ppm <br /> Mexico TWA 600 ppm <br />' Mexico STEL 760 ppm <br /> Toluene 108-88-3 OSHA PEL 100 ppm (1989), 200 ppm (1971) <br /> OSHA STEL 150 pprn (1989), Not established (1971) <br /> OSHA Ceiling 300 ppm (1971) <br /> ACGIH TLV-TWA 50 ppm (skin) <br /> Mexico TWA 100 ppm <br /> Mexico STEL 150 ppm <br /> Tr;methylbenzene 95-63-6 OSHA PEL 25 ppm (1989),Not established (1971) <br /> ACGIH TLV-TWA 25 ppm <br /> Mexico TWA 25 ppm <br /> Mexico STEL 35 ppm <br /> Xylene 1330-20-7 OSHA PEL 100 ppm (1989)(1971) <br /> OSHA STEL 150 ppm (1989), Not established (1971) <br /> ACGIH TLV-TWA 100 ppm <br /> ACGIH TLV-STEL 150 ppm <br /> Mexico TWA 100 ppm (skin) <br /> Mexico STEL 150 ppm (skin) <br /> 1 9.0 CHEMICAL AND PHYSICAL PROPERTIES <br /> APPEARANCE AND ODOR Clear Liquid Hydrocarbon odor <br />' pH Not determined <br /> VAPOR PRESSURE 7-15 lb RVP (ASTM D323) <br /> VAPOR DENSITY: 3 0-4 0 <br />' BOILING POINT 80 0-430 0°F (range) <br /> • MELTING POINT Not determined <br />