R 325.60161 Maximum allowable concentrations for mineral dusts.

Rule 11. Table 7 for mineral dusts, are as follows: TABLE 7 MAXIMUM ALLOWABLE CONCENTRATIONS FOR MINERAL DUSTS SUBSTANCE CAS No.1 MAC mppcf mg/m3 Silica Crystalline * Quartz (respirable) 14808-60-7 ___250___ % SiO2+5 10 mg/m3_ %SiO2+2 Cristobalite 14464-46-1 Amorphous, including natural diatomaceous earth 61790-53-2 20 80 mg/m3_ %SiO2 Silicates (less than 1% crystalline silica) Asbestos, all types See OH 602. Asbestos Standards for Construction Mica 12001-26-2 20 Portland cement 65997-15-1 50 Soapstone – 20 Talc (non-asbestiform) 14807-96-6 20 Talc (fibrous) See OH 602. Asbestos Standards for Construction Tremolite See OH 602. Asbestos Standards for Construction Graphite (natural) 7782-42-5 15 Inert or nuisance particles ** 50 of total dust less than 1% SiO2 (or 15 mg/m3, whichever is the smaller) * The percentage of crystalline silica, SiO2, in the formula is the amount determined from airborne samples. Note: This MAC applies to any operations or sectors for which the respirable crystalline silica standard, OH 690. “Silica in Construction” is stayed or otherwise is not in effect. ** The following are some examples of inert or nuisance particulates when toxic impurities are not present; e.g. quartz less than 1%. Alundum (A1203) Gypsum Rouge Calcium carbonate Limestone Silicon carbide Cellulose Magnesite Starch Corundum (A1203) Marble Sucrose Emery Pentaerythritol Tin oxide Glycerine mist Plaster of Paris Titanium dioxide Graphite (synthetic) Portland cement Vegetable oil mists (except castor, cashew nut, or similar irritant oils) 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. TABLE 7 MAXIMUM ALLOWABLE CONCENTRATIONS FOR MINERAL DUSTS SUBSTANCE CAS No.1 MAC mppcf mg/m3 All MIOSHA Standards shown in this table are referenced in R 325.60151.