Occupational Safety and Health Standards: Toxic and Hazardous Substances, TABLE Z-3 Mineral Dusts

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TABLE Z-3 Mineral Dusts

Substance

Silica:

Crystalline

Quartz (Respirable) . . . . . . . . . . . . . . . . . .

Quartz (Total Dust) . . . . . . . . . . . . . . . . . .

Cristobalite: Use the value calculated from the count or mass formulae for quartz.

Tridymite: Use the value calculated from the formulae for quartz.

Amorphous, including natural diatomaceous earth

Silicates (less than 1% crystalline silica):

Mica . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Soapstone . . . . . . . . . . . . . . . . . . . . . . . . . .

Talc (not containing asbestos) . . . . . . . . . . . .

Talc (containing asbestos) Use asbestos limit

Tremolite, asbestiform (see 29 CFR 1910.1001)

Portland cement . . .

Graphite (Natural) . . . . . . . . . . . . . . . . . . . . . .

Coal Dust:

Respirable fraction less than 5% SiO2 . . . . . . . .

Respirable fraction greater than 5% SiO2 . . . . . .

Inert or Nuisance Dust:d

Respirable fraction . . . . . . . . . . . . . . . . . . .

Total dust . . . . . . . . . . . . . . . . . . . . . . . .

Note -- Conversion factors - mppcf X 35.3 = million particles per cubic meter = particles per c.c.

a Millions of particles per cubic foot of air, based on impinger samples counted by light-field techniques.

b The percentage of crystalline silica in the formula is the amount determined from airborne samples, except in those instances in which other methods have been shown to be applicable.

c Containing less than 1% quartz; if 1% quartz or more, use quartz limit.

d All inert or nuisance dusts, whether mineral, inorganic, or organic, not listed specifically by substance name are covered by this limit, which is the same as the Particulates Not Otherwise Regulated (PNOR) limit in Table Z-1.

e Both concentration and percent quartz for the application of this limit are to be determined from the fraction passing a size-selector with the following characteristics:

Aerodynamic diameter (unit density sphere)

2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

The measurements under this note refer to the use of an AEC (now NRC) instrument. The respirable fraction of coal dust is determined with an MRE; the figure corresponding to that of 2.4 mg/m3 in the table for coal dust is 4.5 mg/m3.

[Note: This document was changed to an html version as of 11/24/2004]

[58 FR 35340, June 30, 1993; 58 FR 40191, July 27, 1993, as amended at 61 FR 56831, Nov. 4, 1996; 62 FR 1600, Jan. 10, 1997; 62 FR 42018, Aug. 4,1997]

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