Mich. Admin. Code R. 325.60161 - Maximum allowable concentrations for mineral dusts
Rule 11. Table 7 for mineral dusts, are as follows:
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TABLE 7 MAXIMUM ALLOWABLE CONCENTRATIONS FOR MINERAL DUSTS |
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SUBSTANCE |
CAS No.1 |
MAC |
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mppcf |
mg/m3 |
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Silica |
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Crystalline * Quartz (respirable) |
14808-60-7 |
250 / % SiO2+5 |
10 mg/m3 / %SiO2+2 |
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Cristobalite |
14464-46-1 |
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Amorphous, including natural diatomaceous earth |
61790-53-2 |
20 |
80 mg/m3 / %SiO2 |
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Silicates (less than 1% crystalline silica) |
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Asbestos, all types |
See OH 602. Asbestos Standards for Construction | |||
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Mica |
12001-26-2 |
20 |
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Portland cement |
65997-15-1 |
50 |
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Soapstone |
- |
20 |
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Talc (non-asbestiform) |
14807-96-6 |
20 |
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Talc (fibrous) |
See OH 602. Asbestos Standards for Construction | |||
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Tremolite |
See OH 602. Asbestos Standards for Construction | |||
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Graphite (natural) |
7782-42-5 |
15 |
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Inert or nuisance particles ** |
50 of total dust less than 1% SiO2 (or 15 mg/m3, whichever is the smaller) |
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* |
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. |
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** |
The following are some examples of inert or nuisance particulates when toxic impurities are not present; e.g. quartz less than 1%. |
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Alundum (A1203) |
Gypsum |
Rouge |
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Calcium carbonate |
Limestone |
Silicon carbide |
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Cellulose |
Magnesite |
Starch |
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Corundum (A1203) |
Marble |
Sucrose |
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Emery |
Pentaerythritol |
Tin oxide |
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Glycerine mist |
Plaster of Paris |
Titanium dioxide |
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Graphite (synthetic) |
Portland cement |
Vegetable oil mists (except castor, cashew nut, or similar irritant oils) |
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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. |
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All MIOSHA Standards shown in this table are referenced in R 325.60151. |
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Notes
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.