Document VGGq11p7eMx0pQj3a99JjbNRw

SCN 98 mv. 1 INTERNAL LETTERHEAD TO .NAME ANO IOCATiOMI See attached list FROM <AMC ANO LOCATION* Mr. Charles S. Laubly - New York REFERENCE NO. CSL:75-10 6 * E E nC fc NO. 0AT 9-5-75 % This copy of Guidelines for Industrial Hygiene is submitted to acquaint you with our recommended practices and procedures for monitoring worker exposures to solvent vapors and gases in our plants. The procedures outlined are con-' sistent with good industrial hygiene practice and meet the present requirements of OSHA. The Corporate Medical Department will be glad to assist you in implementing the monitoring program in your plant. We would appreciate any information regarding the monitoring program presently in force in your plant. CSL:rd Att. Charles S. Laubly Corporate Manager Industrial Hygiene 004369 GUIDELINES FOR INDUSTRIAL HYGIENE /l L The added emphasis on occupational health, in OSHA brought upon, in part, by the asbestos, carcinogen and vinyl chloride standards means that we are going to have to do more monitoring at the plant level. The Corporate Medical Department haa made plant surveys to de termine exposures to noise, dusts, fumes and solvent vapors, and will continue to aid in evaluating any exposure that presents a potential occupational disease hazard. However, the Corporate Medical Department cannot carry on the complete monitoring program prescribed by the OSHA standards--this must be done at the local level. Public Law 91-596 better known as the "Occupational Safety and Health Act of 1970" at the present time requires monitoring only for ex posures to asbestos (1910.93a) and vinyl chloride (1910.93q). However, in Section 5 (a) of the Act, it is implied that each employer should de termine the level of exposure of each employee to workroom contaminants., To be more specific Section 5 (a) of the Act states chat "Each employer shall -- ' i f (1) furnish to each of his employees employment and a place of employment which are free from recognized hazards that are causing or are likely to cause death or serious physical harm to his employees; (2) comply with occupational safety and health standards promulgated under this Act". Section 5 (b) of the Act states that "Each employee shall comply with occupational safety and health standards and all rules, regulations, and orders issued pursuant to this Act which are applicable to his own actions and conduct. In addition, Subpart G - Occupational Health and Control, 1910.93, Air Contaminants of the Rules and Regulations states that, "an employee's exposure to any material listed in Table G-l, G-2, or G-3 of this sec tion shall be limited in accordance with the requirements of the follow ing paragraphs of this section". (See attached pages 1-6). Many of our plants have been monitoring the workplaces where there are exposures to materials covered by the present standards and to those materials presently in Tables G-l, G-2 and G-3. In most instances, where a monitoring program has been established, the Corporate Medical Department has been"Instrumenta1 in implementing the program and will continue to do so. However, it is not possible for the Corporate Medical Department to have on-going programs for each plant. Therefore, it is suggested that the following guidelines be used to conduct the monitoring programs at our plants: 004310 11. Chemical indicator tubes certified by NIOSH may be used for determining exposures to those materials in Tables G-l and G-2. Indicator tube suppliers such as DrHger, Gastec and Mine Safety Appliances supply NIOSH certified tubes for materials such as CO, CO2, Cl, H2S, NH3 and NO2, to mention a few. However, in most situations, until chemical indicator tubes are designated a9 a satisfactory monitoring device by an OSHA standard, the tubes should be used only as a means to identify a problem and not as an analytical tool. At the present time some industrial hygienis-ts are using chemical indicator tubes for evaluating ex posures to materials found in Tables G-l and G-2. However, these evaluations are made only after a specific tube has been calibrated for the material involved. Until such time that we can calibrate chemical indicator tubes, or NIOSH certified cali brated tubes are commercially available, any chemical indicator tube should be used only in the manner stated in the paragraph (1) above. 2. Worker exposures monitored and evaluated by methods consistent with good industrial hygiene practice should be the ultimate goal of our monitoring programs. As mentioned previously, the Corporate Medical Department will assist the Celanese plants in their surveillance of occupational health hazards by initial surveys and periodic evaluations of exposures, but routine moni toring is best done on a regular basis by plant per sonnel selected by management from among those most knowledgable and in keeping within their work assign ments . 3. Plants conducting or planning their own monitoring pro grams should contact the Corporate Medical Department for guidance relative to acceptable industrial hygiene procedures. 4. Analytical work for monitoring programs is best done on site, but in most instances this is not possible. At the present time most of the analytical work is done by a laboratory accredited by the American Industrial Hygiene Association. Any proposed analytical work for Industrial hygiene evaluations should be reviewed by the ~ Corporate Medical Department to assure that the methods of analysis are consistent with good industrial hygiene practice. 004371 Two of our laboratories have expressed an interest in accreditation by the American Industrial Hygiene Association; but until such time that these labora tories are accredited, any analytical services for in dustrial hygiene monitoring which includes sampling methods and laboratory procedures should be reviewed by the Corporate Medical Department. 5. The attached sampling sheet is a suggested form for recording the data significant for an industrial hygiene monitoring program. If you have any questions or comments, please contact the Corporate Manager, Industrial Hygiene. 004372 (o) Table G-l: (1) Moterials with name* preceded by `X"--ceiling values. An employee's exposure to any material in table G-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 exposure to any material in table G-l, the name of which is not preceded by "C", in any 8-hour work shift of a 40-hour work week, shall not ex ceed the 8-hour time weighted average given for that material in the table. Table G-l Substance p.p.m.* mg./M* Acetaldehyde.............................. 200 Acetic acid................................... 10 Acetic anhydride........................ 5 Acetone........................................' 1,000 Acetonitrile.................................. 40 Aoetylene dichloride, seo 1, 2- Dichloroethylene..................... ........... Acetylene tetrabromide............. Acrolein....................................... Acrylamide--Skin...................... 1 0.1 Acrylonitrile--Skin..................... 'ao'" Aldrin--Skin............................... Allyl alcohol--Skin..................... Allyl chloride.............................. "2"' 1 *C Allytelyddyl ether (AGE). Allyl propyl disulfide................. 2-Amlnoethanol, see Ethanol- 10 2 amine........................................ 2-Aminopyridine......................... Ammonia................................. Ammonium sulfamate (Ani 0.5 50 mate)........................................ n-Amyl acetate........................... sec-Amyl acetate......................... Aniline--Skin................... :........ Aiitstdlne (o, [>-Isomers)--Sktn.. 100 125 5 Antimony and compounds (as Sb)....................................... ANTU (alpha naphthyl thiourea)................................... Arsenic and compounds (as As).. Arsine........................................... Azlnphos-methyl--Skin............. . 0.05 Barium (soluble compounds)..., p-Benzooulnone, see Quinone... Benzoyl peroxide........................ Benzyl chloride......................... Biphenyl, see Biphenyl............. Blsphenol A, see Dlglyctdyl ether.......................................... Boron oxide C Boron trifluoride..................... Bromine...................................... i ai Bromoform--Skin..................... 0.5 Butadiene (1. 3-hntadiene)........ 1,000 Butancthioh wc-Butyl mer- v captan................ :...................... 2-Butannne.................................. 200 2-Butnxy thnnol (Butyl Cel- losolve)--Skin ........................ Butvl acetate (n-hutyl acetate). sec-Btityl acetate......................... tert-Butyl acetate....................... Butyl alcohol................. ............ sec-Buty! alcohol........................ tert-Butyl alcohol....................... C Butylamine--Skin.................. 50 150 200 200 100 150 100 5 C tert-Butyl chromate (as CrOj)--Skin............................... n-Butyl glycldyl ether (BOE).. Butyl mercaptan...................... 50 10 350 25 20 2,400 70 14 0.25 0.3 45 0.23 5 3 45 12 2 33 15 525 650 10 0.5 0.5 0.3 as 0.2 0.2 as 3 o. 5 2,200 590 240 710 950 950 300 450 300 IS a: 270 35 Page 1 P-tert-Butyltoluene. Calcium arsenate. Calcium oxide............................. Camphor........... -................. Carbaryl (8evln).................... Carbon black.............................. Carbon dioxide........................... Carbon monoxide.................... Chlordanc--Skin........................ Chlorinated camphene--Skin... Chlorinated diphenyl oxide....... Chlorine..................................... Chlorine dioxide......................... C Chlorine trtfluortde................ C Chloroacetaldehyde................ a-Chloroacetophenone (phenacylchloride).................. Chlorobenzene (monochlorobentene)................................... o-Chlorobentylldene matononitrile (OCBM)........... Chlorobromomethane. 2-Chloro-l.3-buiadiene, see Chloroprene............ ;.............. Chlnrodltihenyl (42 percent Chlorine)--Skin...................... Chlorodiphenyl (54 percent Chlorine)--Skin...................... 1-Chlnro,2.3-epoxypropane, see Epfchlorhydrtn........................ 2-Chloroethanol, saa Ethylana chlorohydrln........................... . Chloroethylana, sea Vinyl chloride................................... . C Chloroform (trichloro- methane)................................. 1-Chloro-l-nttropropane........... Chloroptcrln................................ Chloroprene (2-chloro-l,3- butadlene)--Skin................... 10 2 5,000 50 1 ai ai l a os 75 0.05 200 50 20 ai 25 Chromium, sol. chromic, chromous salts as Cr............ Metal and Insol. salts.............. Coal tar pitch volatiles (ben zene soluble fraction) anthra cene. BaP, phenanthrene, acridine, chrysene, pyrene___ Cobalt, metal fume and dust... Copper fume.............................. Dusts and Mists..................... Cotton dust (raw)..................... Crag herbicide........................ Cresol (all isomers)--Skin........ Crotonaldehyde......................... Cumene--Skin........................... Cyanide (as CN)--Skin........... Cyclohexane............................... Cyclohexanol.............................. Cyclohexanone........................... Cyclohexene............................... Cyclopentadlene........................ 2, 4-D....................................... . DDT--Skin................................ DDVP, see Dichlorvos............. Decaborane--Skin..................... Demeton--Skin...................... Diacetone alcohol (4-hydroxy- 4-methyl-2-pentanone)........... 1,2-dlaminoethane, see Ethylenedlamlne................... Diazomethane............................ Diborane..................................... Dibutylphthalate...................... C o-Diehlorobenzene................ 5 2 60 300 50 50 300 TS 0.05 50 0.2 0.1 50 p-Dichlorobenzene.................... 75 1,000 1,3-Dichloro-5,5-dimethyl hydantoin....................... 1,1-Dlchloroethane............ 100 200 C Dlchloroethyl ether--Skin... 15 Dichloromethane, see Methylenechlorlde................... 1,000 C 1,1-Dlchloro-l-nltroethana.... 1,2-Dlchloropropane, sea Propylenedichloride.................. 10 60 1 5 5 3.6 9,000 55 0.5 0.5 0/5 3 0.3 0.4 3 0.3 350 0.4 1,050 1 0.5 m 0.7 90 r- 0.5 1 0.2 0. 1 0. 1 1 1 15 22 6 245 5 1,050 200 200 1,015 200 10 1 0.3 0.1 240 0.4 0.1 5 300 450 4,950 0. 400 790 90 4,200 60 004373 Table 0-1--Continued Substance p.p.m.* mg./M> * Dichlorotetrsfluoroethane......... Dichlorvos (DDVP)--Skin........ Dleldrin--Skin............................ Dlethylamlne.............................. Dlethylamlno ethanol-Skln... Dl*thylether, see Ethyl ether.. Difluorodibromometh&ne........... C Dlglycidyl ether (DOE)........ DIhydroxybentene, see Hydroqulnone.......................... Dilsohutyl ketone....................... Dlisopropylamine--Skin............ Dimcthoxymethane, see Melhylal.................................... Dimethyl acetamide--Skin........ Dimethylamine........................... Dlmethylaminobenzene, see 1,000 ................ 25 10 100 0.6 SO 5 10 10 7,000 1 a25 75 60 860 2.8 290 20 35 18 Dlmethylanlllne(N-dlmethyl* aniline)--Skin.......................... Dlmethylbeniene, see Xylene... Dimethyl l,2-dibromo-2,2-dl* chloroethyl phosphate, (Dlbrom)...................... ............. Dtmethylformamlde--Skin....... 2.6-Dlmethylheptanone, see Diisobutyl ketone..................... 1.1-Dimethylhydraiine--Skin... Dlmethylphthalate...................... Dimethyisulfate--Skin............... Dinltrobenrene (all isomers)-- Skin............................................ Dinitro-o-cresol--Skin.................. Dinltrotoluene--Skin................... Dloxane (Diethylene dioxide)-- Skin........................................... Diphenyl...................................... Dtphenylmethane diisocyanate (see Methylene bisphenyl isocyanate (MDI)...................... Dipropylene glycol methyl ether--Skin............................... Di-sec. octyl phthalate (Dl-2ethylhexylphthalate)................ Endrin--Skin............................... Epiohlorliydrin--Skin................ EPN-Skin.................... .............. 1.2-Epoxypropatie, see Propyleneoxlde.......................... 2.3-Epoxy-l-propanol. see Glycidol...................................... Ethanethlol, see Ethylmer* captan........................................ Ethsnoiaminc.............................. 2-Ethoxyethanol--Skin ,2-Ethoxyethylacetate (Cello- solve acetate)--Skin............... Ethyl acetate............................... Ethyl acrylate--Skin................. Ethyl alcohol (ethanol).............. Ethylamine.................................. Ethyl sec-amyl ketone (5- mcthyl-3-hcptanonc)............. Ethyl benxene............................. Ethyl bromide......................... Ethyl butyl ketone (3- Heptanone)......................... . Ethyl chloride. .................... Ethyl ether.................................. Ethyl formate.............................. C Ethyl mercaptan................. Ethyl silicate............................... Ethylene chlorohydtln--Skin.. Ethylonediamine......................... Ethylene dibromidc, see 1,2- Dlbromoethanc........................ Ethylene dlchlorlde, see 1,2* Dlchlorocthane......................... C Ethylene glycol dinitrate and/or Nitroglycerin--Skin... 25 3 10 30 as l ........................... 5 15 ............. ............. ............. 1 0.2 1.6 100 a2 360 i 100 ............. ............. 5 ............. 600 5 ai 19 0.5 3 200 100 400 25 1,000 10 25 100 200 50 1,000 400 100 10 100 5 10 6 740 540 1,400 100 1,900 18 130 435 890 230 2,600 1,200 300 25 850 16 25 <a2 i See footnotes at end of table. Page 2 Ethylene flyeol monomethyl ether acetate, aaa Methyl eellosolve acetate.................. Ethylene (mine--Skin............. as l Ethylene oxide......................... Ethyildine chloride, see 1,1- so 90 Dtchloroethane...................... N-Ethylmorphollne--Skin.__ Ferbam...................................... Ferrovanadlum dust............... Fluoride (as F)......................... Fluorine.................................... Fluorotrlchloromethane.......... Formic add.............................. Furfural--Skin......................... Furfuryl alcohol........................ Qlycldol (2,3-Epoxy-lpropanol)................................ Glycol monoethyl ether, see 20 94 ...............................IS ................ 1 ................ 2.5 0. 1 0.2 1,000 5,600 59 5 20 50 200 SO ISO 2-Ethoxyethanol................... . Quthion , see Aztnphoa* methyl..................................... Hafnium.................................... . Heptaehlor--Skin..................... Heptane (n-heptane)...-.......... Hexachloroethane--Skin.......... Hexochloronaphthalene--SkinHexane (n-hexane)...................... 2-Hexanone................................... Hexone (Methyl bobutyl ketone)...................................... see-Hexyl acetate......................... Hydrazine--Skin......................... Hydrogen bromide...................... C Hydrogen chloride.................. Hydrogen cyanide--Skin........... Hydrogen peroxide (90%).......... Hydrogen selenide...................... Hydroquinonc............................. C Iodine........................................ Iron oxide fume........................... Isoamyl acetate............................ Isoamyl alcohol............................ bobutyl acetate........................... bobutyl alcohol......................... Isophorone.................................... Isopropyl acetate......................... Isopropyl alcohol......................... bopropylamine............ .............. Isopropylether............................. Isopropyl glycidyl ether (IQE). Ketene.......................................... Lead arsenate............................... Lindane--Skin............................. Lithium hydride......................... L.P.Q. (liquified petroleum 500 1 500 100 100 SO 1 3 5 10 1 0.05 0.1 ino 100 150 ino 25 250 400 5 500 50 0.5 0.5 0.5 2,000 100. 1,800 410 410 3001. 10 7 11 l.-fe - 0. T-' 2: 1 10 : ' 525 360 700 300 140 950 980 12 2,100 240 0.9 0.15 0.5 0.025 1,000 1,800 Magnesium oxide turns.............. .................. 15 Malathlon--Skin......................... .................. 15 Maleic anhydride......................... 0.25 1 C Manganese................................. ...............................5 Mesityl oxide................................ 25 100 Methanethiol, sea Methyl mercaptan................................. Methoxyehlor............................... 16 2-Methoxyethanol, see Methyl eellosolve................................... . Methyl acetate........................... 200 610 Methyl acetylene (propyns).... 1,000 1,650 Methyl acetylena-nropadlene mixture (MAPP)___--............ 1,000 Methyl acrylate--Skin................ 10 Methyls) (dlmethoxymethant).. 1,000 1,800 35 3,100 Methyl alcohol (methanol)......... 200 260 Methylamine............................... 10 12 Methyl amyl alcohol, sea Methyl lsobutyl carbinol........ . Methyl (n-amyl) ketone (2 Heptanone).............................. C Methyl bromide--Skin........... Methyl butyl ketone, see 2- Hexanone...... ........................... Methyl eellosolve--Skin............. Methyl eellosolve acetate--SUn Methyl chloroform...................... Methylcyclohexane..................... Methylcyclohexanol.................... 100 20 25 25 350 500 100 '465 80 80 120 1,900 2,000 470 004374 i Tablb G-l--Continued Substance p.p.m.* mg./M * 0- Meth ylcyclohexanona--Skin.. Methyl ethyl ketone (MEK), _ see 2-Tlutannne......................... Methyl formate............................ Methyl Iodide--Skin................... Methyl tsobutyl carblnol--Skin. Methyl Isobutyl ketone, see Hexone....................................... Methyl isocyanate--Skin........... C Methyl mercaptan-................ Methyl methacrylate.................. Methyl propyl ketone, see 2- Pentanone................................. . C a Methyl styrene..... -.............. C Methylene blsphenyl Isocyanate (MDI).................... Molybdenum: Soluble compounds.................. Insoluble compounds.............. Monomethyl aniline--Skin........ C Monomethyl hydrazine-- Skin............................................ Morpholine--Skin........................ Naphtha (coaltar)....................... Naphthalene................................ Nickel carbonyl........................... Nickel, metal and soluble empds, as N1............................. Nicotine--Skin............................. Nitric acid.................................... Nitric oxide.................................. l*-Nltroanlline--Skin.................. Nitrobenzene--Skin.................... p-Nitrochlorobenzene--Skin----Nitroethane.................................. Nitrogen dioxide.......................... Nitrogen trifluoride..................... Nitroglycerin--Skin.................... Nltromethane.............................. 1- Nltropropane......................... 2- Nitropropane......................... Nltrotoluene--Skin..................... Nltrotrichloromethane, see Chloropicrin............................. Octachloronaphthalene--Skin.. Octane......................................... Oil mist, mineral....................... Osmium tetroxide....................... Oxalic acid................................... Oxygen difluorlde........ .............. Ozone............................................ Paraquat--Skin........................... Parathion--Skin.......................... Pentaborane................................. Pentachloronaphthalene--Skin. wo 100 5 25 0.02 10 100 100 0.02 ............. ............. 2 0.2 20 100 10 0.001 ............. .............. 2 25 1 1 100 5 10 0.2 100 25 25 5 ........... 500 ............. .............. .............. ' 0.05 0.1 .............. .............. a 005 Pentane.................................. 1,000 2-Pentanone.................................. 200 Perchloromethyl mercaptan.... a1 Perchloryl fluoride...................... 3 Petroleum distillates (napbtha). 600 Phenol--Skin............................... 6 p-Phenylene diamine--Skin....................... Phenyl ether (vapor).................. 1 Phenyl ether.biphenyl mixture (vapor)........................ 1 Phenylethylene, see Styrene..................... Phenyl glycidyl ether (POE)...1 10 Pbenylhydrazine--Skin............. 6 Phosdrln (Mevmphos )-- Phosgene (carbonyl chloride)"-.........0.*i Phosphine.................................... a3 Phosphorus (yellow) Phosphorus pentasulflde............................. Phosphorus trichloride............... 0.6 Phthalic anhydride..................... 2 Picric acid--8kln......................................... Pival (2-Plvalyl-l,3* indandione)............................................... m 250 28 100 0.05 20 410 480 0.2 5 15 9 0.35 70 400 50 0.007 1 as 5 30 6 6 1 310 9 29 2 250 90 90 30 0.1 2,350 *5 0.002 1 0.1 0.2 0.5 0.1 1 o.oi 0a.s5 2,950 700 as 13.5 2,000 19 0.1 7 60 22 ai a4 0.4 1 ai 1 1 3 12 ai ai Page 3 Platinum (Soluble Salts) at Propargyl alcohol--Skin........... Propane...................................... n-Propyl acetate........................ Propyl alcohol........................... n-ptopyl nitrate........................ Propylene dichlorlde................ Propylene lmlne-Skln............ Propylene oxide........................ .......... a 002 1 1,000 .....1....8..0..0........ 200 840 200 500 25 no 75 350 25 100 240 Propyne, see Methylacetylene. Pyrelhnim................................. Pyridine..................................... 5 15 Qulnone...................................... ai o.4 RDX-Skin............................... ................ 1.6 ' Rhodium, Metal fame and dusts, as Rh........................... Soluble salts........................... Ronnel........................................ Rotenone (commercial)............ Selenium compounds (as 8e)... Selenium hexafluoride.............. .................. ................ ............ ................ ................. a 05 0.1 0.001 10 6 0.2 0.4 Silver, metal and soluble com pounds............................ Sodium fluoroacetate (1080)-- Skin................................. . Sodium hydroxide..................... 6t!bine........................................ ................ ................ ............ o. i aoi 0.05 2 as Stoddard solvent..................... Strychnine................................. Sulfur dioxide............................ Sulfur hexafluoride.................... 500 ................ 5 1,000 2,950 a 15 13 8,000 Sulfuric add............................... ................ 1 Sulfur monochloride................. Sulfur pentafluoride................. Sulfuryl fluoride........................ 1 0.025 5 5 -.0.25te 20 Systox, see Demeton ............ 2.4.5T.......................................... ......... io"*? Tantalum................................... ................ TE DP-Skln............................ ................. 5 0.2 Tellurium................................... ..............................0.1 Tellurium hexafluoride............... a 09 0.2 TEPP--Skin.................................................... 0.05 C Tcrphenyle.............................. 1 9 l.l, l ,2-Tetraehloro-2,2-dIfluoro- ethane....................................... 600 4,170 1.1.2.2- TetrachlofO-l,2-difluoro- ethane....................................... 600 4,170 1.1.2.2- Tetiachloroethane--Skin 6 35 Tetrachlorocthylene, see Per- chloroothylene............................................. Tetrachloromethane, see Carbon tetrachloride................................................ Tetrachloronaphthalene--Skin.................... 2 Tetraethyl lead (as Pb)--Skin.................... 0.075 Tetrahydrofuran......................... 200 590 Tetramethyl lead (as Pb)-- Skin.............................................................. 0.07 Tetramethyl succinonitrile-- Skin........................................... 0.5 3 Tetranttromethane...................... Tctryl (2,4.6-trinltrophenyl- 1 8 methylnitramlne)--Skin............................ 1.5 Thallium (soluble com pounds)--Skin as T1................................... 0.1 Thlram............................................................ 5 Tin (Inorganic empds. except oxides................................ .......................... 2 Tin (organic empds)...................................... 0.1 C Toluene-2,4*dlisocyanate........ o-Toluldine--Skin....................... 0.02 6 0.14 22 Toxsphene, see Chlorinated camphene..................................................... Tributyl phosphate....................................... 1.1.1- Trichlorocthane see Methyl chloroform...................................... 1.1.2- Trichloroethane--Skin.... Titaniumdioxide....................... 10 45 IS Trlchloromethane, see Chloro form......................................... Trlchloronaphthalene--Skin... 1.2.3- Trichloropropene.......... 50 6 300 1,1,2-Trtchloro 1,2,2-trifluoroethane........................................ 1,000 7,600 Trfethylamine............................. 25 100 Trifluoromonobromomethane__ 1,000 6,100 2,4,6-Trinltrophenol, see Picric acid............................................................................... 004375 Table G-l--Continued Substance p.p.m.* mg.fM* * 2,4,6-TrinUrophenylmethyl- nttramlne, see Tetryl....................................................... Trinitrotoluene--Skin..................................... 1. 5 Trlorthocrcsyl phosphate................................ 0. l Triphenyl phosphate....................................... 3 Turpentine................................... 100 660 U ranlum (soluble compounds)...................... 0.05 Uranium (insoluble compounds)................... 0.25 C Vanadium: VjOidust....................................................... 0.5 ViOilumo...................................................... 0.1 Vinyl benzene, seo Styrene................................................. *C Vinyl chloride...................... 600 1,300 Vlnylcyanlde, see Acrylonitrile.......................................... Vinyl toluene............................... 100 480 Warfarin............................................................. 0.1 Xylene (xylol)............................. 100 435 Xyildine--Skin............................ 5 25 Yttrium............................................................. 1 Zinc chloride lume........................................... 1 Zinc oxide fume................................................ 5 Zirconium compounds (as Zr)........................ 5 1970 Addition. Parts of vapor or gas per million parts of contami nated air by volume at 25s C. and 760 mm. Hg pressure. Approximate milligrams of particulate per cubic meter of air. (No footnote "e" is used to avoid confusion with celling value notations.) An atmospheric concentration of not more than 0.02 p.p.m., or personal protection may be necessary to avoid headache. ' As sampled by method that does not eollsct vapor. t For control of general room air, biologic monitoring Is essential for personnel control. (b) Table G-2: Page i (1) 8-hour lime weighted averages. An employee's exposure to any material listed in table G-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 G-2 shall not exceed at any time dur ing an 8-hour shift the acceptable ceiling 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 ceiling 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 exposure must be compen sated by exposures to concentrations ltes than 10 p.p.m. so that the cumulatfsfcfe exposure for the entire 8-hour work' shwft does not exceed a weighted average of .11} p.p.m. :` Material Tabu 0-2 8-hour time weighted average Acceptable celling concentration Acceptable maximum peak above the acceptable celling concentre- tlon for an 8-hour shut. - -- ......-- Concentration Maximum duration Benzene (Z37.4-196S).......................................10 p.p.m................25 p.p.m............... 50 p.p.m................ 10 minutes. Beryllium and beryllium compounds 2pg./M>......... . 5<ig./M............... 2ing.fM*............... 30 minutes. (Z37.29-1970). Cadmium fume (Z37.5-1970). ..........0.1 mg./M............. 3 mg./M>....................................... . Cadmium dust (Z37.5-1970)........................... 0.2mg./M........... 0.6mg./M.......................................... Carbon disulfide (Z37.3-1968)........................ 20 p.p.m............. 30 p.p.m............... 100 p.p.m.............. Do. Carbon tetrachloride (Z37.17-1967)......... 10 p.p.m............. 25 p.p.m............... 200 p.p.m........... 6 minutes In any 4 hours. Ethylene dlbromtde (Z37.J1-1970).... ............20p.p.m............... 30p.pa........ SOp.pun.....___ 6 minutes. Ethylene dichloride (Z37.21-1969)................. 50 p.p.m..............100 p.p.m.............. 200 p.p.m........... 5 minutes In * any 3 hours. Formaldehyde (Z37.18-1967).......................... 3 p.p.m............... Sp.pm................. 10 p.p.m............... 30 minutes. Hydrogen fluoride (Z37.23-1969)........................ do................................................. ................... .......... Fluoride as dust (Z37.28-1969)....................... 2-5mg./M*......................................................................... Lead and Its inorganic compounds (Z37.ll- 0.2 mg.fM*......................................................................... 1969). Methyl chloride (Z37.18-1969).......................lOOp.pun.......... 200 p.p.m................ 300 p.p.m........... 5 minutes In any 3 hours. Methylene Chloride (Z37.3-1969)................... 500 p.pim........ 1,000 p.p.m............ 2,000 p.p.m......... 5 minutes In any 2 hours. Organs (alkyl) mercury (Z37JO-1969)......... 0.01 mg.fM *... 0.04 mg./M >.......................................... Styrene (Z37.15-1969)..................................... 100 p.p.m........ 200 p.p.m................ 600 p.p.m........... 5 minutes in any 3 hours. Trichloroethylene (Z37.14-1967).............................do....................... do..................... 300 p.p.m............ 5 minutes In any 2 hours. Tetrachloroetbylene (Z37J2-1967)....................... .do.......................do...........................do.............. 5 minutes In any 3 hours. Toluene (Z37.12-1967)..................................... 200 p.p.m........ 300 p.pjn............... 500 p.p.m............ 10 minutes. Hydrogen sulfide (Z37.2-1966)................................................... 20 p.p.m.................50 p.p.m............... 10 minutes once only if no other measur able exposure OCCUR. Mercury (Z37.8-1971)................................................................. 1 mg.l10M, Chromic acid and chromatet (Z37.7-1971)....................................... do * 004376 Page 5 (e) Table G-3: An employee's exposure to any material listed in table G-3, in any8-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. Table Q-5--Mineral Dusts Substance Mppcf Mg/M* Silica: Crystalline: Quartz (respirable)............. 250 < lOmg/M* Quartz (total dust) %S10+6 %S10H-2 30mg/M* Cristoballte: Use 'A the value calculated from the count or mass formulae for quartz. Tridymite: Use the value calculated from the for mulae for quartz. Amorphous, including natural dlatomaceous earth.................. %StOH-2 20 90mg/M* %SIO) talline silica): Mica................................................ Soapstone............................... 20 20 Talc (non-asbestos-form)... 20* Talc (fibrous). Use asbestos limit .................................. Tremolite (see talc, fibrous) Portland cement................... 80 Graphite (natural)................... Coal dust (respirable fraction 15 less than 8% SiOj)..................................... 2.4mg/M* or For more than 8% SlOj. lOrog/M* Inert or Nuisance Dust: Respirable fraction... Total dust................... . %S10H-2 15 6mg/M* 50 15mg/M> Note: Conversion factors-- mppcfX35.3-million particles per cable meter = particles per c.c. Millions of particles per cubic foot of air, based on lmpinger 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. > As determined by the membrane filter method at 430XPhase contrast magnification. Both concentration and percent quarts for the appli cation ot this limit are to be determined from the fraction passing a sire-selector with the'following characteristics: " Containing < 1% quartz; if > 1% quartz, usa quartz limit. (d) Computation formulae: (1) (i) The cumulative exposure for an 8-hour work shift shall be computet! as follows: cr* + c,r, 4- ... c.r. where: E is the equivalent exposure for the working shift. C 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 C. The value ofE shall not exceed the 8-hour time weighted average limit in table G-l, G-2, or G-3 for the material involved. (ii) To illustrate the formula prescribed in subdivision (i) of this subparagraph, note that isoamyl acetate has an 8-hour time weighted average limit of 100 p.p.m. (tabl G-l). Assume that an employee is subject" to the following exposure: : Two hours exposure at 150 p.p.m. Two hours exposure at 75 p.p.m. Four hours exposure at 50 p.p.m. Substituting this information in the for mula, we have 2 x 150 + 2 x 75 + 4 X 50 ------------------------------------------ s 81.25 p.p.m. 8 Since 81.25 p.p.m. is less than 100 p.p.m., the 8-hour time weighted average limit, the exposure is acceptable. (2) (i) In case of a mixture of air contaminants an employer shall compute the equ lvalent exposure as follows: where: Em it the equivalent exposure for the mixture. C is the concentration of s particular contaminant. ' l, is. the exposure limit for that contaminant, from table G-l, G-2, or G--:l. 004377 Page 6 The value of Em shall not exceed unity U). (ii) To illustrate the formula prescribed in subdivision (i) of this subparagraph, con sider the following exposures: Material Actual con centration of 8-hour exposure 8-hour time weighted average exposure limit Acetone (Table G-l) 500 p.p.m. 2-Butanone (Table G-l) 45 p.p.m. Toluene (Table G-2) .. 40 p.p.m. 1,000 p.p.m. 200 p.p.m. 200 p.p.m. Substituting in the formula, we have: 500 45 40 " " 1,000 + 200 + 200 Em = 0.500 + 0.225 + 0.200 E- = 0.025 Since E is less than unity (1), the expourecombination is within acceptable limits. () To achieve compliance with paragraph (a) through (d) of this section, administrative or engineeringcontrols must first be determined and implemented 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 contami nants within the limits prescribed in this sec tion. Any equipment and/or technical measures used for this purpose must be approved for each particular use by a compe tent industrial hygienist or other technically qualified person. Whenever respirators are used, their use shall comply with 1910.134. 004378 INDUSTRIAL HYGIENE SURVEY *As ppm o r mg/m ; **T h re sh o ld lim it v a lu e r ***T im e w eighted average *oJ4 OJ ^ UVi ** fi > 0) oH 6 O O w i 4J e Q 0> C du h6 -OO u9 uc r<i wQ. 00 c s *2 (0 o CO > d m- fo-4 o 4CJU Co f-4 eawn 3 Vui aa)) oof Q " O' (d 1) g065 8 CO CO Sd r 004379