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ARE: BENZENE - 0 12-3 50%, TOLUENE - 2 73-21 . 800, meta XYLENE - <br /> 1 . 77-3 875k, para XYLENE - 0 . 77-1 . 58°x, ortho XYLENE - 0 68-2 . 686%, <br /> AND ETHYL BENZENE - 0 . 36-2 86% TYPICAL PERCENTAGE OF TETRAETHYL <br /> LEAD IS NOT AVAILABLE <br /> TETRACHLOROETHYLENE (C12C=CC12) , 1, 2, -DICHLOROETHYLENE (CICHWCHCI) <br /> AND TRICHLOROETHYLENE (C1CH=CC12) , ARE TOXINS AND CARCINOGENS. <br /> UNITS USED TO DESCRIBE OCCUPATIONAL EXPOSURES TO HAZARDOUS <br /> SUBSTANCES INCLUDE EXPOSURE LIMIT, ALSO KNOWN AS THE "THRESHOLD <br /> LIMIT VALUE" (TLV) , CEILING LIMIT, AND THE CONCENTRATION LEVEL <br /> THAT IS " IMMEDIATELY DANGEROUS TO LIFE AND HEALTH" (IDLH) THE <br /> EXPOSURE LIMIT DEFINES THE MAXIMUM CONCENTRATION OF A SUBSTANCE TO <br /> WHICH ONE CAN BE EXPOSED DURING AN 8 HOUR PERIOD WITHOUT SUFFERING <br /> SIGNIFICANT HEALTH EFFECTS THE CEILING LIMIT IS THE <br /> CONCENTRATION LEVEL THAT CANNOT BE EXCEEDED AT ANY TIME, i e . , A <br /> SUITABLE RESPIRATOR MUST BE WORN IF CONCENTRATION VALUES REACH THE <br /> CEILING LIMIT. THE IDHL LEVEL REPRESENTS A MAXIMUM CONCENTRATION <br /> FROM WHICH ONE COULD ESCAPE WITHIN 30 MINUTES OF RESPIRATOR <br /> FAILURE WITHOUT EXPERIENCING ESCAPE-IMPAIRMENT OR IRREVERSIBLE <br /> HEALTH DAMAGE IDLH VALUES ARE NOT LISTED FOR SUBSTANCES THAT ARE <br /> POTENTIAL HUMAN CARCINOGENS . <br /> EXPOSURE TABLE <br /> SUBSTANCE EXPOSURE LIMIT CEILING LIMIT IDLH <br /> BENZENE 0 1ppm (8hrs) 1ppm (15min) CARCINOGEN <br /> TOLUENE 100ppm (l0hrs) 20vppri lklomin) 2000ppm <br /> XYLENE 100ppm (8hrs) 200ppm (10min) 1000ppm <br /> ETHYL BENZENE 100ppm (8hrs) N.A 2000ppm <br /> TETRAETHYL LEAD 0 0067PPM N A 3 6ppm <br />