Document Gzmg5O6V6VnmdRoq0rJ3j202V

,r=V $ 1910.1001 Title 29--Labor Tabu Z-3--Miswal Dusts Substance Mppcf Mg/M1 Silica: Crystalline: Quartz (respirable)......--. 250 lOmg/M1" %SIOr+4 %SIO,+2 Quartz (total dust)................................... 30mg/M* Cristoballte: Use H the Value calculated from the count or mass formulae for quartz. Trldymlte: Use M the value calculated from the for mulae lor quartz. Amorphous, Including natural dlatomaceous earth,..-_____ %SjOj+2 20 IJOmg/M1 %S10. Iltcates (less than 1% crys talline silica): Mica........................... 20 Soapstone........ 20 Talc (non-asbestos-form) .. 20* Talc (fibrous). Use asbestos limit ............................... Tremollte (see talc, fibrous) Portland cement.......... . SO Graphite (natural)...... 16 Coal dust (respirable fraction less than 6% SlOi).................................... For more than 6% 8iOi....... ...................... 2.4mg/M' or lOmg/M1 Inert or Nuisance Dust: Respirable fraction___ Total dust.................. . %SIO+2 16 6mg/M> 60 16mg/M> Note: Conversion factors-- <nppcfX36.3-mlllion particles per cubic meter -particles per c.c. Millions of particles per cubic loot of air, based on tmplnger samples counted by light-field technics. > The percentage of crystalline silica In the formula Is the amount determined from air-borne samples, ex cept In those Instances In which other methods have been shown to be applicable. I As determined by the membrane filter method at <30Xphase contrast magnification. - Both concentration and percent quartz for the appli cation of this limit are to be determined from the fraction passing a size-selector with the following characteristics: Containing < 1% quartz; If > 1% quartz, use quartz limit. Aerodynamic diameter (unit density sphere) 2 2.5 3.6 6.0 10 Percent passing selector eo 75 60 25 0 The measurements under this note refer to the use o an AEC Instrument.(' the respirable fraction of coal dust Is determined with a M RE the figure corresponding to that o(2.4 Mg/M1 In the table for coal dust ls4.6 Mg/M*. (39 PR 23502, June 27, 1974. Redesignated and amended at 40 FR 23073, May 28. 197&] 510 R&S 100730 R&S 100731 Chapter XVII--Occupational Safety and Health Admin, $ 1910.1000 Table 2!-l--Continued Tabu Z-l--Continued Substance p.p.m.* mg./M* * Substance p.p.m.* Vinyl toluene............................... 100 Warfarin........................................................... Xylene (xylol)________________ 100 Xylldlua--Skin........................... 8 480 0.1 435 25 Yttrium........................................................... Zinc chloride fume.......................................... Zinc oxide fume.............................................. Zirconium compounds (as Zr).................... 1 1 6 6 WTO Addition. Puts of vapor or gas per million parts of contami nated air by volnme at 28* C. and 760 mm. Hr pressure. * Approximate milligrams of particulate per cubic meter of air. (No footnote "c" Is used to avoid confusion wltb calling value notations.) * An atmospheric concentration of not mora than 0.02 p.p.m., or personal protection may be neceesary to avoid headache As sampled hy method that does not collect vapor. ' For control of general room air, biologic monitoring Is essential for personnel control. Tabu Z-2 Material 8-bour time welgbted average Acceptable celling concentration Acceptable maxlmmn peak above the acceptable celling concentn- tlon for an S-bour shut. -- .......... . --------------- - ' -- Concentration Maximum dotation Bantene (Z37.4-1969)____________________ lOp.p-m________ 25 p.pjn............ 80p.pjn... lOznJnntes. Beryllium end beryllium compounds 2g./M>5*ig./M*----------- 24*g./M*.,, 30 mlnutea. (ZJ7.29-1970). Cadmium fume (Z37J-1970)0.lmg./M8mg./M.................................... Cadmium dust (Z37.8-I97D)0.2 mg./M*...................................... O.Smg./M*.................................. Carbon disulfide <Z37.3-1968).......................20 p.p.m...............30 p.p.m...............100p.p.m.-. Do. Carbon tetrachloride (Z37.17-1967)...............10 p.pjn...............28 p.pjn............... 200 p.pjn... 8 minutes In any 4 hours. Ethylene dtbromlde (Z37A1-1970)___ ...... 20p.p-m_______ 30 p.pjn........... . 80 p.pjn___ 8 minutes. Ktbyiene dlchloride (Z37.21-1969)80 p.pjn100 p.pjn-------------------------------------- 200 p.pjn.. 8 minutes In any 3 boors. Formaldehyde (Z37.18-1967)____ _________ 8 p.pjn................5 p.pjn............... 10 p.pjn____ 10 minutes. Hydrogen fluoride (ZJ7-28-1969).do................................................................... .. Fluoride as dust (Z37.28-1969)...................... 2.8 mg./M*................................................................ Lead and iti Inorganic oompounds (Z37.H- 0.2 mg./M*................................ ............................. 1989). Methyl chloride (Z37.18-1989)..................... . 100 p.p.m........ 200 p.pjn......... 8 minutes In any 3 hours. Methylene chloride (Z37A-1909).................. . 800 p.pjn____ 1,000 p.pjn___ 3 mlnutea la any 2 hours. __ Orgino (alkyl) mercury (237-80-1909)------ . 0.01 mg./M <... 0.04 mgJM ___ Styrene (Z37.18-1969)................................... . 100 p.p.m........ 200 p.pjn.......... 8 minutes In any J bourse Trichloroethylene (Z37.19-19S7).................. 8 minutes In any 2 hours. Tetrachloroetbylens (2*7-23-1967)............ ......... do--......... ....... do....... ........ ............ do_____ 8 minutes In any 3 hours. Toluene (Z37.12-1967).................................. . 200 p.pjn____ 300 p.pju......... 10 minutes. Hydrogen sulfide (Z37-2-1988)..................... 20 p.pJ&........... 10 minutes once only If no other msasur- able exposure occurs. Mercury (Z37.8-1971)................................................................1 mgJIOM ............................................ Chromic add and chromatea (Z37.7-1971)......................................do ................................................ 509  1910.1000 Title 29--Labor Table Z-l--Continued Table z-l--Continued Substance p.p.m.* mg./M* * Substance p-p.m.* mg./M1 -Nickel carbonyl.......................... Nickel, metal and soluble a ooi cmpds, as N1............................ Nlcotioe--Skin............................ Nitric acid................................... Nitric oxide................................. p-N itroanillne--Skin _................ Nitrobenzene--Skin................... p-NItrochlorobemene--Skin___ Nltroetbane...... .......................... 2 2t 1 t io6"` Nitrogen dioxide........................ Nitrogen trifluoride.................... 5 10 Nitroglycerin--Skin................... NItrometbane...... ....................... 1-Nltropropane........................... 2-Nltropropane............................ Nltrotoluene--Skin............... . Nltrotrichlorometbane, see Chloroplcrin.............................. 0.3 100 20 20 0 Octarhloronaphthalene--Skin... Octane........................................ Oil mist, mineral........................ 000 Osminin tetroxlde........................ Oxalic acid.................................... Oxygen difluoride....................... Otone........................................... Paraquat--Skin......................... . Parathion--Skin.......................... 0.00 ai Pentaborane.............................. a ooo Pentachloronaphthalene--Skln.. Pentachloropbenol--Skin........................... Pentane..................................... 1.000 2-Pentanone................................ 200 Perchloromethyl mercaptan___ a1 Perchloryl fluoride...................... 3 Petroleum distill ites (naphtha). 000 phenol--Skin.............................. 0 p-Phenylene diamine--Skin...... ................ Phenyl ether (vapor)................. 1 Phenyl ether-biphenyl mixture (vapor).............. ........ 1 Phenylethylene, see Styrene....................... Phenylglycldylether(POE)... 10 Phenylhydraxlne--Skin........... 0 Phosdrln (Mevlnphos )-- Skin............................................................ Phosgene (carbonylchloride)... Phosphine................................... Oil 0l 3 Phosphoric acid................... ....................... Phosphorus (yellow)................................... Phosphorus pentachloride........................... Phosphorus pentasulflde.............................. Phosphorus trichloride.............. 0.6 Phtballc anhydride. _................ 2 Picric acid--Skin.......................................... Plval (2-Plvaly1-1,3Indandlone)................................................ Platinum (Soluble salts) as Pt............................................... Propargyl alcohol--Skin............ 1 Propane...................................... 1,000 n-Propyl acetate......................... 200 Propyl alcohol............................ 200 n-Propyl nitrate.......................... 35 Propylene dlchlorlde.................. Propylene Imlne--Skin.............. Propylene oxide.......................... Prnpyne. see Methylacetylene... Pyr'thrum.................................... 75 3 100 Pyridine...................................... Qalnone....................................... 0.1 RDX-Skln.................................................. Rhodium, Metal (ume and dusts, as Rh............................................... Soluble salts............................................... . Ronnel........................................................... Rotenone (commercial)................................. Selenium compounds (as Be)........................ Selenium hexafluoride................ 0.03 See footnote* at end of table. a 007 1 0. 30 6 1 310 9 29 2 250 90 90 30 ai 2,350 a 002 l ai aa 0. an a oi a a 2.950 700 as 13. 2,000 19 ai 7 so 22 ai at at i ai l l 3 12 ai ai a 002 1.800 StO 800 no 350 5 2t0 It at 1.6 0.1 0.001 10 a2 at Silver, metal and soluble com pounds.......... ........................ a ot 6odtum fluoroacetate (1060)-- Skin.............................................................. Sodium hydroxide.......................................... Sllbtne......................................... a1 Stoddard solvent-............. 00 Strychnine...................................................... Sulfur dioxide.............................. Sulfur hexafluoride..................... 1,000 Sulfuric add.................................................... Sulfur monochloride................... 1 Sulfur pentilfluoride.................. a 023 aot 2 at 2, OtOa it 13 4,000 1 0 a 25 Sulfaryl fluoride......................... 20 Systox, see Demeton .................................... 2.t,5T............................................................... 10 Tantalum........................................................ TEDP-Skln.................................................. "ellurium........................................................ "tlurlum hexafluoride.............. a 02 CEPP-Skln................................................... 0,2 ai a2 aot C Terphenyls............................. . ,l,l,2-Tetracliloro-2.2-dlflnoro- 1 9 ethane....................................... 00 t,17D 1.1.2.2-Tetracbloro-l,2-difluoro- ethane........ ............................. 00 1.1.2.2-Tetrachloroethane--Skin t, 170 3 Tetrachloroethylene. see Per* chloroethylene............................................... Tetrachloromelhane, see Carbon tetrachloride.................................................. Tetrachloronaphthalene--Skin..................... 2 Tetraethyl lead (aa Pb)--Skin..................... a 075 Tetrahydrofuran........................ 200 90 Tetramethyl lead (as Pb)-- Skin.......................................... Tetramethyl sucdnonltrUe-- Skin.......................................... Tetranltromethane..................... Tetryl (2,t.6-trlnltrophenyl- at l ao7 3 6 methylnltramtne) --Skin......................... LS Thallium (soluble com pounds)--Skin aa ................... o.i Thlram..................................................... t Tin (Inorganic cmpds. except oxides....................................... ................ Tin (organic cmpds)..... .............................. C Toluene-2,tdllsocyanate___ am o-Toluldlne--Skin................... Toxaphene, see Chlorinated 2 ai ait 22 camphene...................... . Tributyl phosphate................. 1.1.1-Trlchloroethane, see Methyl chloroform................ 1.1.2-Trlchloroethane--Skin.... Tltanlumdloxide...___ ....... 10 t5 It Trichloromethane, see Chloro form. Trichloronaphthalene-- Skin..,.. 1.2,3-Trlchloropropane............... 50 300 1,1,2-Trichloro 1,2,2-trlfluoroethane........... .......................... Trlethylamlue............................ Trifluoromonobromomethane... 1.000 35 1.000 7, 00 100 4,100 2,4,0-Trinltrophenol, see Picric acid............................................ . 2,t,9-Trinltrophenylraoihyl- nltramlne. see Tetryl.................................. Trinitrotoluene--Skin........................ . Trtorthrv-resyl phosphate..................... TrinHtnyl phosphate-............ . Turpentine................................. 100 Uranium (soluble compounds). a1. i 3 40 aot Uranium (Insoluble compounds)__________ 0.2A C Vanadium: V|Oi dust..................................................... VjO* fume..................................................... at ai Vinyl benzene, see Styrene............................ Vtnylcyantde, see Acrylonitrile..................... Seo footnotes at end of table. 508 R&S 100732 fi?';irf R&S 100733 Chapter XVII--Occupational Safety and Health Admin. 1910.1000 Table z~l--Continued Tablb Z-l--Continued Subetnnee p.p.m.* mp./M* * Substance p.p.m,* mfr, Dlnltro-o-cres3l--Skin.................. Dlnltrotoluene--Skin..................... Dloiane (Dlethylene dioxide)-- Skin.......................................... 100 Diphenyl..................................... 0.2 Dlphenylmethane dllsocynnate (tee Methylene btsphenyl Isocyanate (MM)........................ Dlpropylene glycol methyl ethei-Skln.............................. 100 Dl-sec. octyl phthalate (Di-2- ethylhexylpbtbalate).................. Endrln--Skin.......................-........ Eplchlorhydrtn--Skin......... . EPN--Skin..................................... 1.2-Epoxypropane, see Propyleneoxlde_______________ 2.3-Epory-l-propanol, see Olycldol....................................... Etbanethlol, seo Ethylmer- captan.......................................... Etbanolamlne............................. 2-Ethoxyethanol--Skin.............. 200 2-Ethoiyethylacetste (Cello- solve acetate)--Skin...-----.. 100 Ethyl acetate.............................. too Ethyl acrylate--Skin. .............. 25 Ethyl alcohol (ethanol)............. 1,000 Ethylamlne................................. 10 Ethyl sec-amyl ketone (5- methyl-3-heptanone). ............. 25 Ethyl benzene.................. . 100 Ethyl bromide............................ 200 Ethyl bntyl ketone (3- Heptanone)....................... ---Ethyl chloride--......... . Ethyl ether.................................. Ethyl formate............................. G Ethyl mercaptan----------------- 50 1,000 400 100 10 Ethyl silicate......................-- 100 Ethylene chlorohydrln--Skin.. 5 Ethylenedlamlne................... 50 Ethylene dlbromlde, see 1,2* Dlbromoethane.................... Ethylene dlchlorlde, see 1,2- Dichloroethane............................ C Ethylene glycol dlnltrate and/or Nitroglycerin--Skin... 402 Ethylene glycol monomethyl ether acetate, see Methyl oellosolye acetate......................... Ethylene Imlne--Skin................ OS Ethylene oxide............................ so Ethylldine chloride, see 1,1- Dlchloroethane....... ................. N-Ethylmorphollne--Skin------- 20 Ferbam............................................ Ferrovanadlum dust...--------- ... Fluoride (as F)............................... Fluorine....................................... 01 Fluorotrlchloromethane........... 1.000 Formic acid................................. Furfural--Skin............................ Furfuryl alcohol.......................... 5 5 50 Olycldol (2,3-Epoxy-l- propanol)..................... 50 Glycol monoethyl ether, see 2-Ethnxyethenol.......................... Onthlon , see Azlnpbos- methyl.......................................... Hafnium.......................................... Heptachlor--Skin.................... ...... Heptane (n-heptane)........... . 500 Hexachloroethane--Skin------... 1 1 Hexachloronaphthalene--Skin----- Hexane (n-heiane)........ ............. 500 k-Hexanone.......- ............ .-- 100 Hexone (Methyl Isobutyl ketone)... ............................. 100 eec-Hpiyl acetate.... .................... 50 Bee footnote at end of table, <12 LS 300 1 <00. 5 01 19 0$ 740 540 1,400 100 1,900 18 130 43ft 890 230 2,600 1,200 300 2ft 850 16 25 1 to M IS 1 2.5 02 6.600 9 20 200 150 05 05 2,000 10 02 1,800 110 110 300 Hydrazine--Skin..*.., a............ l Hydrogen bromide..................... 3 C Hydrogen chloride.................. 5 Hydrogen cyanide--Skin*.*.*., 10 Hydropen peroxide (00%)...,.. 1 Hyurocen selenlde............. . aos Hydroqolnone....................... C Iodine.,............................ 01 Iron oxide fume........ ................. Iaoamyl acetate, 100 Isoamyl alcohol...................... . 100 Isobutyl acetate___ ............ 150 Isobutyl alcohol........*............. . 100 Isophorone.. ............. 25 Isopropyl acetate......... . 250 Isopropyl alcohol......... . Isopropylamlne............. 40f0t Isopropylether.................. ......... 600 Isopropyl glyddyl ether (IGE). Ketone....................................... 50 as Lead arsenate......... ................... Lindane--Skin......................... Lithium hydifde........*......... . L.P.G. (liquified petroleum gas)........................................... la ooo Magnesium oxide fume................ Malathlon--Skin........................ . Maleic anhydride................. a 25 C Manganese.......___________ Mesityl oxide......................... 25 Methanethlol, see Methyl mercaptan.............................. . Methoxych lor.,......................... . 2-Methoxyethanol, see Methyl cellosolve........................ . Methyl acetate............................ 200 Methyl acetylene (propyne).... 1*000 Methyl acetylene-propadlene mixture (MAPP)..................... 1.000 Methyl acrylate--Skin............... 10 Methylal(dlmethoxymethane).. 1,000 Methyl alcohol (methanol)...... 200 Methylamine............................. 10 Methyl amyl alcohol, see Methyl isobutyl carbinol__ .... Methyl (n-amyl) ketone (2- Heptanone)................ . 100 C Methyl bromide--Skin....... 20 Methyl butyl ketone, see 2- Hexanone................................. . Methyl cellosolve--Skin............. 2ft Methyl cellosolve acetate--Skin 2ft Methyl chloroform........ . 860 Methylcyciohexane............. 600 MethyIcyclohexanol............ 100 0*Methylcyclohexanone-- Skin.. 100 Methyl ethyl ketone (MEK), see 2-nutanone..................... . ftMethyl formate........................... 100 Methyl iodide--Skin............... . Methyl isobutyl carbinol--Skin. 25 Methyl Isobutyl ketone, see Hexone........................... .-- Methyl isocyanate--Skin......... . 0.02 C Methyl mercaptan^,..*..*... 10 Methyl methacrylate........... 100 Methyl propyl ketone, see 2- Fentanone...,....................... . C o. Methyl styrene. 100 C Methylene bisphenyl Isocyanate (Mul).a02 Molybdenum: Soluble compounds_____ ____ Insoluble compounds.......... Monomethyl aniline--Skin____ 2 C Monomethyl hydrazine-- Skin.......................................... <X2 Morpholine--Skin,,.............. *-- 20 Naphtha (coaltar)...................... 100 Naphthalene........................................ 10 See footnotes at end of table. L 10 7 n 1. a i 10 525 860 700 300 140 950 980 12 2,100 240 0.0 0.15 aft at2ft 1,800 IS lft 1 6 100 Zft 110 1,100 l.foo 85 3, luu 260 12 m 80 120 1,000 7,000 470 460 2S0 28 100 0.0ft 20 410 480 as 6 lft 0 0,86 70 400 50 507 =./v7 4 1910.1000 Title 29--Labor Table Z"1--Continued Table Z1--Continued Substance p.pjn.* mg./M* 4 Substance p.pjn.* mg,/M 4 ANTU (alpha naphthyl thiourea).............. .................... Arsenic and compounds (os As). Arsine,.***................... .............. Azlnphos-methyl--Skin_______ a 06 Barium (soluble compounds)..* p>Bentoqulnone, see Qulnone.* Benzoyl peroxide................. ... Benzyl chloride........................... Biphenyl, see Diphenyl........ Blsphenol A, see Dlglycldyl ether.,..***....,............ Boron oxide.................. . C Boron trifluoride-..*-. Bromine................................ . Bromoform--Skin.................. * Butadiene (1, 3-butadlene)..... Butanethlol, see Butyl mer* a1 1 as 1,000 captan. 2-Butanone.............................. . 2-Butoiy ethanol (Butyl Cel- loeolee)--Skin.......................... Butyl acetate (n*butyl acetate). sec-Butyl acetate..___ _ tert-Buiy) acetate.--.**.......... Butyl alcohol..... ........................ eo-Butyl alcohol......................... 200 60 150 200 200 100 ISO tert-Butyl alcohol....................... C Butylamlne--Skin.................. 100ft C tcrt-Butyl chromate (as CrO)--Skin.__. n^Bctyl glycidyl ether (BGE)_. 50 Butyl mercaptan,,................. p-tert*Butyltoluene.......... . 10 10 Calcium arsenate........................ . Calcium oxide.................. ...................... Camphor.............. ....... ...... 2 Carharyl (SeYin ).......................... Carbon black...................... Carbon dioxide............ . ft,000 Carbon monoxide............. so Chlordane--Skin......... .................. Chlorinated camphene--Skin. ... ____ Chlorinated diphenyl oxide.......... Chlorine.......................... . 1 Chlorine dioxide........ ai C Chlorine trlfluoride... ai C Chloroacetatdehyde............. l dr-Chloroacetophenone (phenacylchlorfde).................. a os Chlorobenzene (monocbloro* benzene)...... ........................ . 0-Chlnrobenzyllden malononltrlle (QCBM).___ ** Chlorobromomethane .... aCh'orM.&butadltne. se** Chloroprene............... . 76 a oft 200 Chlorodlphenyl (42 percent Chlor(ne)--Skin............. . Chlorodlphenyl (M percent Chlorine)--Skin...,....................... 1-Chloro,2,3-epoxypropane, see Bplchlorhydrln.............................. aChloroethanol, see Ethylene chlorohydrin*...................... . Chloroethylene, see Vinyl chloride........................................... C Chloroform (trichloro- methane)............... ................. SO 1-Chloro-l-nltropropane............. 20 Chloropicrin.......___________ ai Chloroprene (2-chloro-l,3- butadtene)--Skin............... 2S Chromium, sol. chromic, chromous salts as Cr________ ... ....... Metal and insol* salts......... . See footnotes at end of table. 0.3 aft a2 0.2 ac 15 3 0,7 5 2,200 M0 240 710 950 9S0 300 460 300 15 ai 270 35 60 1 5 5 6 9,000 sas s as as 3 as as 3 as SCO 0.4 1,0(0 l aft 240 100 a7 SO aft Coal tar pitch volatiles (ben- teno soluble fraction) anthra cene, RaP. phenanthrene, acridine, chrysene, pyrene....... Cobalt. metal fumo atul dust.*.. Copper fume......... ..................... Dusts and Mists...,................ Cotton dust (raw)............... Crag herbicide.................... . Cresol (all isomers) --Skin...... 5 Crotonaldehyde..,.................. . Cumene--Skin......................... 2 60 Cyanide (as CN)--Skin... Cyclohexane--....*.............. Cyclohexanol-..-................... Cyclohexanone.................. -- Cyclohexene............................. Cyclopen tadiene ....... . 2, 4-D............................................ 300 60 50 300 75 DDT--Skin.................................. DDVP. see Dlchlorvos-......... Decaborane--Skln..... ............... aoc Demeton- Skin..,............... Dlacetone alcohol (4*hydroxy* 4-methy1-2-pentanone)........ 50 1.2-dlamlnoethane, see Ethylenedlamine..-.-.--........ Diazomethane................... . Dlborane...................................Dlbutylphthalate....................... C o-Dlchlorohenzene................. 0.2 ai 50 p-Dlchlorobenzene............ . 75 Dlchlorodifluoromethane*......... 1,000 1.3-DlchIoro-fl.ft-dimethyl hydantoln*. ................... ......... ioo 1.2'DichIoroethylene. *.............. C Dlchloroethyl ether--Skin... 200 1ft Dichloromethane, see Methylenechloride........... . Dlchloromonofluoromethane.*. 1.000 C 1.1-Dichloro-l-nitroethane..,. 10 1.2-Dichloropropane, see Propylenedlcnlorlde, ------- -Dlcblorotctrafluoroethsne.......... 1,000 Dlchlorvos (DDVP)-Skln........................ Dleldrin--Skin........................ Dlethylamine....................... 25 Dlethylamtno ethanol--Skin. Dlethyiether, see Ethyl ether Dlfluorodioromomethane....... 10 ioo C Dlglycldyl ether (DOE).., ac Dihydroxybenzene, see Hydrooulnonc............. ............. Dllsobutyl ketone........ --.......... Diisopropylamlne--Skin....... 60 6 Dtmethoxymethane, see Dimethyl acetamide--Skin....... Dlmethylamlne................. . Dlmothylamlnobentene, see Xylldene................... ................ * Dlmethylaniline(N-dlmethyl- aniline)--Skin.......................... Dlmethylbenzem*. see XyleneDimethyl l,2-dlb:omo-2,2-dl* chloroet^yl phosphate. 10 10 ft DKiethylformamlde--Skin____ 10 2,6-Dlmethylheptanone, see Dllsobutyl ketone_____ _____ -- 1,1-Dlmethylbydrailne--Skin__ aft Dlmethylphthalatc..... .................. .......... Dlmethylsullate--Skin l Dtnltrobenzeno (all isomers)-- Skin. See footnotes at end of table. a2 at at l l 15 22 6 245 5 1.050 200 200 1,015 200 10 1 as ai 240 a4 at 5 300 450 4,060 as 400 790 SO 4,200 <0 7,000 1 a 26 7S so 800 aft 290 20 36 1ft 2S to 1 5 ft 506 30 99 (/) o o --I w 4* R&s 100735 .*~',T'- -~.r57.-+r-i'ry *'. . r. it -- Chapter XVII--Occupational Safety and Health Admin. $ 1910.1000 work week, shall not exceed the 8-hour time weighted average limit given tor that material in the table. (d) Computation formulae: (1) (i) The cumulative exposure for an 8-hour work shift shall be computed as follows: I--... OnT* Where: a Jt la the equivalent exposure for the work ing shift. O Is the concentration during any period of time T where the concentration remains constant. T is the duration In hours of the exposure at the concentration O. The value of E shall not exceed the 8hour time weighted average limit in table Z-l, Z-2, or Z-3 for the material involved. (il) To Illustrate the formula pre scribed in subdivision (1) of this subpara graph, note that isoamyl acetate has an 8-hour time weighted average limit of 100 p.p-m. (table Z-l). Assume that an employee Is subject to the following exposure: Two hours exposure at 160 p.pjn. Two hours exposure at 76 p.pjn. Four hours exposure at 60 p.p.m. Substituting this Information in the formula, we have 2X160+2X76+4X60 ---------------------------------=81.35 p.pjn. 8 Since 81.25 p.p.m. Is less than 100 p.pm,, the 8-hour time weighted average limit, the exposure is acceptable. (2) (i) In case of a mixture of air con taminants an employer shall compute the equivalent exposure as follows: o c, c. X-- - ------ 1-------h ... -- Where: L, It, lm E- is the equivalent exposure for the mixture. O Is the concentration of a particular con taminant. L Is the exposure limit for that contami nant, from table Z-l. Z-2, or Z-3. The value of E,, shall not exceed unity (1). (il) To illustrate the formula pre scribed in subdivision (1) of this sub paragraph. consider the following exposures: Material Actual con- centratioo of 8-hour exposure 8-hoartlsM weigh averagi^B exposure limit Acetone (Table Z-l)___ _ 1,000 p.p.m. 2-Butauone (Table Z-l). .. 48 p.p.m___ 200 p.pjn. Toluene (Table Z-2)_..., 200 p.pjn. Substituting in the formula, we have: 600 45 40 H=----------- H--+--~ 1,000 200 200 E-=0.600 + 0-226 + 0-300 Em=0.926 Since E Is less than unity (1) . the expo sure combination is within acceptable limits. (e) To achieve compliance with para graph (a) through (d) of this section, administrative or engineering controls must first be determined and imple mented whenever feasible. When such controls are not feasible to achieve full compliance, protective equipment or any other protective measures shall be used to keep the exposure of employees to air contaminants within the limits pre scribed in this section. Any equipment and/or technical measures used for this purpose must be approved for each par ticular use by a competent Industrial hygienist or other technically qualified person. Whenever respirators are used, their use shall comply with $ 1910.134. Table Z-l Substance p.p.m.* mg./M* 1 Acetaldehyde.............................. 200 Acetic add.................................. 10 Acetic anhydride........................ 5 Acetone....................................... 1,000 Acetonitrile................................. 40 Acetylene dlchlorlde, see 1. 2- Dlchloroethylene......................................... Acetylene terrsbromlde........... 1 Acrolein....................................... 01 Acrylamide--Skin.......................................... Acrylonitrile--Skin..................... 20 Aldrln--Skin................................................... Allyl alcohol--Skin..................... 2 Allyl chloride.............................. *c Allylclycldyl ether (AOE). 1 10 Allyl propyl disulfide................ 2 7-Amlnoeihanol, see EthonoP amine....... ........................... ..................... . 2-Amlnopyrldlne........................ OS "Ammonia................................. 80 Ammonium sulfamate (Am man) ...................................................... n-Amyl acetate........................... 100 sec-Amyl acetate........................ Aniline--Skin............................. 128 8 Anlsldtne (o, p-lsomers)--Skin...................... Antimony and compounds (as Sb).......................................................... Bee footnote* at end of table. 380 28 20 2,40700 14 0.28 0.3 48 0 28 8 3 4182 d'" IS 828 8810 08 08 505  :]t " eery y-s { 1910.1000 1o0736 CO <# cc Till* 29--Lab r Subpart Z--Toxic and Hazardous Substances Source: 39 FR 23502, June 27, 1974, unless otherwise noted. Redesignated at 40 FR 27073, May 28, 1975. 1910.1000 Air contaminants. An employee's exposure to any mate rial listed in table Z-l, Z-2, or Z-3 of this section shall be limited in accord ance with the requirements of the follow ing paragraphs of this section. (a) Table Z-l: (1) Materials with names preceded by "C"--Ceiling Values. An employee's ex posure to any material in table Z-l, the name of which is preceded by a "C" (e.g,, C Boron trifluoride), shall at no time exceed the ceiling value given for that material in the table. (2) Other materials--8-hour time weighted averages. An employee's expo sure to any material in table Z-l, the name of which is not preceded by "C'\ in any 8-hour work shift of a 40-hour work week, shall not exceed the 8-hour time weighted average given for that material In the table. (b) Table Z-2: (1) 8-hour time weighted averages. An employee's exposure to any material listed in table Z-2, in any 8-hour work shift of a 40-hour work week, shall not exceed the 8-hour time weighted average limit given for that material in the table. (2) Acceptable ceiling concentrations. An employee's exposure to a material listed in table Z-2 shall not exceed at any time during an 8-hour shift the ac ceptable celling concentration limit given for the material in the table, except for a time period, and up to a concentration not exceeding the maximum duration and concentration allowed in the column under "acceptable maximum peak above the acceptable celling concentration for an 8-hour shift". (3) Example, During an 8-hour work shift, an employee may be exposed to a concentration of Benzene above 25 p.p.m. (but never above 50 p.p.m.) only for a maximum period of 10 minutes. Such ex posure must be compensated by expo sures to concentrations less than 10 p.p.m, so that the cumulative exposure for the entire 8-hour work shift does not exceed a weighted average of 10 p.p,m. (c) Table Z-3: An employee's expo sure to any material listed in table Z-3, In any 8-hour work shift of a 40-hour 504