Code of Federal Regulations (Last Updated: July 5, 2024) |
Title 41 - Public Contracts and Property Management |
Subtitle B - Other Provisions Relating to Public Contracts |
Chapter 50 - Public Contracts, Department of Labor |
Part 50-204 - Safety and Health Standards for Federal Supply Contracts |
Subpart D - Gases, Vapors, Fumes, Dusts, and Mists |
§ 50-204.50 - Gases, vapors, fumes, dusts, and mists.
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§ 50-204.50 Gases, vapors, fumes, dusts, and mists.
(a)
(1) Exposures by inhalation, ingestion, skin absorption, or contact to any material or substance
(i) at a concentration above those specified in the “Threshold Limit Values of Airborne Contaminants for 1968” of the American Conference of Governmental Industrial Hygienists, except for the ANSI Standards listed in Table I of this section and except for the values of mineral dusts listed in Table II of this section, and
(ii) concentrations above those specified in Tables I and II of this section, shall be avoided, or protective equipment shall be provided and used.
(2) The requirements of this section do not apply to exposures to airborne asbestos dust. Exposures of employees to airborne asbestos dust shall be subject to the requirements of 29 CFR 1910.93a.
(b) To achieve compliance with paragraph (a) of this section, feasible administrative or engineering controls must first be determined and implemented in all cases. In cases where protective equipment in addition to other measures is used as the method of protecting the employee, such protection must be approved for each specific application by a competent industrial hygienist or other technically qualified source.
Table II - Mineral Dusts
Substance Mppcfe Mg/M3 Silica: Crystalline: Quartz (respirable) 250f 10mg/M3m %SiO2 = 5 %SiO2 = 2 Quartz (total dust) 30mg/M3 %SiO2 = 2 Cristobalite: Use 1/⁄2 the value calculated from the count or mass formulae for quartz. Tridymite: Use 1/⁄2 the value calculated from the formulae for quartz. Amorphous, including natural diatomaceous earth 20 80mg/M3 %SiO2 Silicates (less than 1% crystalline silica): Mica 20 Soapstone 20 Talc 20 Portland cement 50 Graphite (natural) 15 Coat dust (respirable fraction less than 5% SiO2) 2.4mg/M3 or For more than 5% SiO2 10mg/M3 %SiO2 = 2 Inert or Nuisance Dust: Respirable fraction 1 5mg/M3 Total dust 505 15mg/M3 Aerodynamic diameter (unit density sphere) Percent passing selector 2 90 2.5 75 3.5 50 5.0 25 10 0 [36 FR 23217, Dec. 7, 1971]