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c OCCUPATIONAL SAFETY AND HEALTH GUIDELINE FOR BENZENE ' POTENTIAL HUMAN CARCINOGEN INTRODUCTION (e carbo mayproducts eT� re�l� (e g.. in a This guideline summarizes pertinent information about ben- berzem tine for workers, employers. and occupational safety and 3.Caution Benzene will attack some forms of plastics.cost- health professionals who may need such information to con- tags.and rubber. duct effective occupational safety and health programs.Raecom- • FUmmability mendations may be superseded by new developments an these 1. Flash point 41.1°C (120F)(closed cup) fields. therefore, readers am advised to regard these nxom- 2 Autoignition ternpenuure:4997(928°F) mendations as general guidelines 3.Flammable hmin an air,%by volume:Flier-. IA.tipper,7.1 SUBSTANCE IDENTIFICATION 4�• �� ' carbon ��' and � atmiguishaius are d bcuve.Water miry be an ineffec- tive atwiguishant but may be used to cool fire-exposed con- * Formula: C J4 talnem • Structure: S Class IB Flammable Liquid(29 CFR 1910.106), Flamma- btltty Rating 3(NEPA) 6.Unusual fire and explosion hazards Benzene liquid w flam- mable, and its vapors can easily form explosive mixtures. • Synonyms:Benzol,benzole,benzolene,buarburet of hyd o- Flashbacks may occur along a vapor trail. gen, carbon oil. coal naphtha ' VAnming properties • Identifiers:CAS 713-2.KI`EC5 CY1400000;DOT1114. 1. Odor threshold: 12 ppmZ. Eye irsttstion levels. 3p00 ppmfor 0.S-1 hour label required "Flammable Liquid" 3 Other inkumma<ion:3DW ppm may tmtue nose and respua- • Appearance and odor:Colorless liquid with an aromatic tory tract. odor 4 Evaluation of warning properties for asp. selection: CHEMICAL AND PHYSICAL PROPERTIESare n t caoside 4 m recornu,ardil,g�- rators for use with carcinogens. • Physical data EXPOSURE LIMITS I Molecular weight 78.12 2 Soiling point(at 750 mmHg)- 811160(176°F) The current Occupational Safety and Health Adnamistrattion 3 Specific gravity(water — Iy 0.88 (OSHA)permanible exposure Bait(PEL)for I , -P rue is I part 4 Vapor density(air - 1 at boiling point of benzene): 2.7 of I F-F, is per mdlwn parts of air(PPM)as a tittle-weighted S Melting point S ST(42T) average(M)concen stion over an 9-hour workdaiR: the 6. Vapor pressure at 20'C(68'F): 75;mmHg short-term exposure limit as S ppm in any 15--maim sampling ' 7 Solubility in water,g/100 g wamer at 2000(69 OF):0A6 period. The Nauonal Inauttim for Occupational, Safkty sad 8. Evaporation rate(butyl axxta>r - Q: 5.1 Health(NIOSH)recommends that benzene be controlled and 9 Saturation concentration in air (approximate) at 250C handled as a poumtud btmian cammogeri to the workplace and (77 OF) 12 5% (125A00 ppm) that exposure be wdimd to die lowest feasible 111111L Tea l0. Ionisation potential:9.25 eV NIOSH recommended exposure limit(REL)is QI ppm[1132 • ivy milligrams of I P 7 P re per cubic mxer of air(nig/nM]as in Incompatibilities:Benzene reacts with strong oxidizers mclud- 8-hour TWA and 1 ppm (3.2 mg/ms) as a ceiling to cry ' ing chlorine,oxygen,and bromine with awn 135-manmumplatigperiod.The N IOSH REL is the lowest ean- U.S. DEPARTMENT OF HEALTH AND HUMAN SERVKM Public Health Service Centers for Disease Control National Institute for Occupational Safety and Health Division of Standards Devekgxmrrt and Tedinology Transfer 1988 SenzerW 1