R 325.60158 Maximum allowable concentrations for substances; I to M.

Rule 8. Table 4 for substances I to M, are as follows: TABLE 4 MAXIMUM ALLOWABLE CONCENTRATIONS FOR SUBSTANCES; I TO M SUBSTANCE CAS No.1 MAC/Ceiling/STEL ppm mg/m3 Indene 95-13-6 10 45 Indium and compounds (as In) 7440-74-6 --- 0.1 C Iodine 7553-56-2 0.1 1 Iron oxide fume 1309-37-1 --- 10 Iron salts, soluble (as Fe) Varies with compound --- 1 TABLE 4 MAXIMUM ALLOWABLE CONCENTRATIONS FOR SUBSTANCES; I TO M SUBSTANCE CAS No.1 MAC/Ceiling/STEL ppm mg/m3 Isoamyl acetate 123-92-2 100 525 Isoamyl alcohol 123-51-3 100 360 Isobutyl acetate 110-19-0 150 700 Isobutyl alcohol 78-83-1 100 300 Isophorone 78-59-1 25 140 Isopropyl acetate 108-21-4 250 950 Isopropyl alcohol 67-63-0 400 980 Isopropylamine 75-31-0 5 12 Isopropyl ether 108-20-3 500 2,100 Isopropyl glycidyl ether (IGE) 4016-14-2 50 240 Kaolin Inert dust Ketene 463-51-4 0.5 0.9 Lead and lead compounds See CS 603. Lead Exposure in Construction* Limestone 1317-65-3 Inert dust S Lindane 58-89-9 --- 0.5 Lithium hydride 7580-67-8 --- 0.025 L.P.G. (Liquified petroleum gas) 68476-85-7 1,000 1,800 Magnesite 546-93-0 Inert dust Magnesium oxide fume 1309-48-4 15 S Malathion 121-75-5 --- 15 Maleic anhydride 108-31-6 0.25 1 C Manganese and compounds (as Mn) 7439-96-5 --- 5 Marble 1317-65-3 Inert dust S Mercury 7439-97-6 --- 0.1 S Mercury (organic compounds) Varies with compound --- 0.01 Mesityl oxide 141-79-7 25 100 Methane Inert gas Methanethiol See Methyl mercaptan Methoxychlor 72-43-5 --- 15 2-Methoxyethanol See Methyl cellosolve TABLE 4 MAXIMUM ALLOWABLE CONCENTRATIONS FOR SUBSTANCES; I TO M SUBSTANCE CAS No.1 MAC/Ceiling/STEL ppm mg/m3 Methyl acetate 79-20-9 200 610 Methyl acetylene (propyne) 74-99-7 1,000 1,650 Methyl acetylene-propadiene mixture (MAPP) – 1,000 1,800 S Methyl acrylate 96-33-3 10 35 Methylal (dimethoxymethane) 109-87-5 1,000 3,100 Methyl alcohol (methanol) 67-56-1 200 260 Methylamine 74-89-5 10 12 Methyl amyl alcohol See Methyl isobutyl carbinol Methyl (n-amyl) ketone (2-heptanone) 110-43-0 100 465 S, C Methyl bromide 74-83-9 20 80 Methyl butyl ketone See 2-Hexanone S Methyl cellosolve 109-86-4 25 80 S Methyl cellosolve acetate 110-49-6 25 120 C Methyl chloride 74-87-3 100 210 Methyl chloroform 71-55-6 350 1,900 Methylcyclohexane 108-87-2 500 2,000 Methylcyclohexanol 25639-42-3 100 470 S o-Methylcyclohexanone 583-60-8 100 460 Methylenedianiline (MDA) See CS 605. Methylenedianiline (MDA) in Construction* Methyl ethyl ketone (MEK) See 2-Butanone Methyl formate 107-31-3 100 250 S Methyl iodide 74-88-4 5 28 Methyl isoamyl ketone 110-12-3 100 475 S Methyl isobutyl carbinol 108-11-2 25 100 Methyl isobutyl ketone See Hexone S Methyl isocyanate 624-83-9 0.02 0.05 Methyl mercaptan 74-93-1 0.5 1 Methyl methacrylate 80-62-6 100 410 Methyl propyl ketone See 2-Pentanone C Methyl silicate 681-84-5 5 30 TABLE 4 MAXIMUM ALLOWABLE CONCENTRATIONS FOR SUBSTANCES; I TO M SUBSTANCE CAS No.1 MAC/Ceiling/STEL ppm mg/m3 C alpha-Methyl styrene 98-83-9 100 480 C Methylene bisphenyl isocyanate (MDI) 101-68-8 0.02 0.2 Methylene chloride (dichloromethane) See OH 313. Methylene Chloride* Molybdenum Soluble compounds 7439-98-7 --- 5 Insoluble compounds --- 15 S Monomethyl aniline 100-61-8 2 9 S, C Monomethyl hydrazine 60-34-4 0.2 0.35 S Morpholine 110-91-8 20 70 1 The CAS number is for information only. Enforcement is based on the substance name. For an entry covering more than 1 metal compound measured as the metal, the CAS number for the metal is given - not the CAS number for the individual compounds. A See R 325.60154(2)(a). C See R 325.60154(2)(b). S See R 325.60154(2)(c). STEL See R 325.60154(2)(d). * Caution--these rules contain extensive requirements for exposure to these substances. All MIOSHA Standards shown in this table are referenced in R 325.60151.