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OCCUPATIONAL SAFETY AND HEALTH GUIDELINE FOR { BENZENE POTENTIAL HUMAN CARCINOGEN INTRODUCTION 2.Hazardous decornpaition pry:Tome vapors and gases (e.g.,carbon monoxide)malt be released in a fisc involving This guideline summarizes pertinent information about ben- berazuc. urn for.-%orkers. employers. and occupational safety and 3.Caution:Benzene will attack some forms of plastim Cost- health professionals who tnny need such information to con- Ings.and rubber. duct effective occupational safety and health prograrrm Recom- • Flamnuiblilky mendations may be superm%W by new developments in these I. plash point: -11.1`C(12-F)(closed cup) fields; therefore, readers ace advised to regard these necom- 2. Amoignitiott temperature:498°C (Mn mendations as general guidelines. 3.FWn m"limits in air, %by volume:Lower, 1A;upper, 7.1 4. 8xtinrgunhant: Alcohol fulattt, carbon dioxW, and dry SUBSTANCE IDENTIFICATION dhca*Waaduguishmstsandbcdve.V4Wn aybean ircetlec- . tine extinguishant but may be used to cool fire.exposed con-Formula: C•H. Win, • Structure: 3. Clm W Flarninable Liquid(29 CFR 19MI06).Mamma- biiity Rating 3(NFPA) 6.instal fire and=plosion harirds.Benzene liquid is flam- mable. and its vapors can easily form explosive mixtures. • flashbacks may occur along a vapor trait. Synonyms:Benzol.benzok.benzolene,bicarbuMofhydro- gen. carbon oil. coal naphtha ! Udo Odor ppmks • Identifiers:CAS 71-43-2;RTECS CY140DOO�;170�I' 1114. 2. Eye irritation levels: 3004 ppm for 0.S-1 hour label required.- "Flanrnrable Liquid" 3 Otter information:31104 ppm may irritate nose and respuz- • Appearance and odor:Colorless liquid with an aromatic tory tract. odor 4. Evaluation of warning properties for respiraoor selection: CHEMICAL AND PHYSICAL PROPERTIES a:,ex o�rsrdetrd"' �- raoers.for use with carcinogens. • Physical'aft EXPOSURE LIMITS 1. Molecular weight: 7812 2. Boiling point(at 768 mmHg): SM19C(176-F) The current Occupational Safety and Health Administration 3. Specific gravity (water = t):0.88 (OSHA)pavAnible otposure limit(PEW for benzene is I part. �I 4. Vapor density (air - 1 at boiling point of benzene): 2.7 of bamccae per million parts of air("14)as a titre*waighted S. Melting point: 5.590(42°F) average MMA)conornustion ow as 8-hoar worlohift;die 6. Vapor pressure at 2040(680F): 75 mmHg short-term exposure limit is 5 ppm hi any 13-minute sampling, 7. Solubility in water.S/100,g water at 20*C(68•F):OW mod. Mat Nadoaal Latitune for OcoVational Satety and 8. Evaporation rate(butyl acetate - 1): 5.1 Health(NIOSH)recommends that bennoenre be controlled and 9. Saturation cocnemtrstion in air (approximate) at 25-C hanadledasa potential human cim:i�in the worW=and (n-F): 12.5% 025AW ppm) that atposim be reduced to the latest 6casrbie' ltmvL Thr l4 Ionization potential:9.25 dV !NIOSH recar mended,exposm limit(REL)is 0.1 ppm[0.32 • Reactivity m lligratrrs of benzene per cubic era Pip of air(mglu0)l as an ltacoctrpatibilido:Unsene n*=with strong oxidizers intrad- 8-hoar TWA pad l ppm (3.2 mgltt) as a oeiiing in any ing chlorine. oxygen,and bromine with iter. 6-mimme sonphng period.The NIOSH REL is the lowest con- M& DEPARTMENT OF HEALTH AND HUMAN SERVICES Public Health Service Centers for Dieoeaw Control National Irutitule for Ocxttpatiotaat Safety and HesM Welon of Standards Devsbpmsnt and Tedtttok*y Transfer 1888 Renter+ 1