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Michigan Administrative Code (Last Updated: November 16, 2016) |
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Department LR. Licensing and Regulatory Affairs |
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MIOSHA |
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Chapter Part 601. Air Contaminants for Construction |
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Part 601. AIR CONTAMINANTS FOR CONSTRUCTION |
Section 325.60161. Maximum allowable concentrations for mineral dusts.
All data is extracted from pdf, click here to view the pdf.
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Rule 11. Table 7. Mineral dusts
TABLE 7
Substance
MAC
mppcf
mg/m3
Silica
Crystalline *
Quartz (respirable)
Cristobalite, see crystalline quartz
250
% SiO2+5
10 mg/m3_
%SiO2+2
Amorphous, including natural diatomaceous earth
20
80 mg/m3_
%SiO2
Silicates (less than 1% crystalline silica)
Asbestos, all types, see OH Part 602, R 325.51301 to R 325.51302
Mica
20
Portland cement
50
Soapstone
20
Talc (non-asbestiform)
20
Talc (fibrous), see OH Part 602, R 325.51301 to R 325.51302
Tremolite, see OH Part 602, R 325.51301 to R 325.51302
Graphite (natural)
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.
** The following are some examples of inert or nuisance particulates when toxic impurities are not present; e.g. quartz less than 1%.
Alundum (A1203) Calcium carbonate
Gypsum Limestone
Rouge
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)
History: 2002 AACS; 2013 AACS.