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US. ACGIH Threshold Limit Values <br />ValueTypeComponents <br />TWA 0.5 ppm <br />TWA 50 ppmCumene (CAS 98-82-8) <br />TWA 100 ppmCyclohexane (CAS <br />110-82-7) <br />STEL 1000 ppmEthanol (CAS 64-17-5) <br />TWA 20 ppmEthylbenzene (CAS <br />100-41-4) <br />STEL 500 ppmGasoline (CAS 86290-81-5) <br />TWA 300 ppm <br />STEL 1000 ppmHexane (Other Isomers) <br />(CAS 96-14-0) <br />TWA 500 ppm <br />STEL 500 ppmn-Heptane (CAS 142-82-5) <br />TWA 400 ppm <br />TWA 50 ppmn-Hexane (CAS 110-54-3) <br />TWA 300 ppmOctane (All isomers) (CAS <br />111-65-9) <br />TWA 600 ppmPentane (CAS 109-66-0) <br />TWA 20 ppmToluene (CAS 108-88-3) <br />STEL 150 ppmXylene (o, m, p isomers) <br />(CAS 1330-20-7) <br />TWA 100 ppm <br />US. NIOSH: Pocket Guide to Chemical Hazards <br />ValueTypeComponents <br />TWA 125 mg/m31,2,4, Trimethylbenzene <br />(CAS 95-63-6) <br />25 ppm <br />STEL 1 ppmBenzene (CAS 71-43-2) <br />TWA 0.1 ppm <br />TWA 245 mg/m3Cumene (CAS 98-82-8) <br />50 ppm <br />TWA 1050 mg/m3Cyclohexane (CAS <br />110-82-7) <br />300 ppm <br />TWA 1900 mg/m3Ethanol (CAS 64-17-5) <br />1000 ppm <br />STEL 545 mg/m3Ethylbenzene (CAS <br />100-41-4) <br />125 ppm <br />TWA 435 mg/m3 <br />100 ppm <br />Ceiling 1800 mg/m3Hexane (Other Isomers) <br />(CAS 96-14-0) <br />510 ppm <br />TWA 350 mg/m3 <br />100 ppm <br />Ceiling 1800 mg/m3n-Heptane (CAS 142-82-5) <br />440 ppm <br />TWA 350 mg/m3 <br />85 ppm <br />TWA 180 mg/m3n-Hexane (CAS 110-54-3) <br />50 ppm <br />Ceiling 1800 mg/m3Octane (All isomers) (CAS <br />111-65-9) <br />385 ppm <br />TWA 350 mg/m3 <br />75 ppm <br />Ceiling 1800 mg/m3Pentane (CAS 109-66-0) <br />UNLEADED GASOLINE <br />Prepared by 3E Company <br />913457 Version #: 03 Revison date: 23-May-2014 Print date: 23-May-2014 5 / 15