Mich. Admin. Code R. 325.60161
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. | |||
All MIOSHA Standards shown in this table are referenced in R 325.60151. | ||||
Mich. Admin. Code R. 325.60161