Powered by GoogleTranslate

Exposure Limits for Synthetic Mineral Fibers


AGENCY/SUBSTANCE

OSHA PEL - TWA

 

General Industry
Inert or Nuisance Dust
(1910.1000, Table Z-3)


Respirable fraction: 15 mppcf* or 5 mg/m3
Total dust: 50 mppcf* or 15 mg/m3

Construction Industry
Inert or Nuisance Particulates
(1926.55, Appendix A)

50 mppcf* (or 15 mg/m3 whichever is the smaller) of total dust <1% SiO2

Shipyard
Fibrous Glass
(1915.1000, Table Z)

Respirable fraction: 5 mg/m3
Total dust: 15 mg/m3

Shipyard
Mineral Wool
(1915.1000, Table Z)


Respirable fraction: 5 mg/m3
Total dust: 15 mg/m3

Shipyard
Inert or Nuisance Particulates
(Mineral Dusts Table)

50 mppcf* (or 15 mg/m3 whichever is the smaller) of total dust <1% SiO2
*Millions of particles per cubic foot of air, based on impinger samples counted by light-field techniques.

ACGIH TLV - TWA

Synthetic Vitreous Fibers [1999](1)

Continuous filament glass fibers** : 1 f/cc, A4

Continuous filament glass fibers*** : 5 mg/m3, A4

Glass wool fibers** : 1 f/cc, A3

Rock wool fibers** : 1 f/cc, A3

Slag wool fibers** : 1 f/cc, A3

Special purpose glass fibers** : 1 f/cc, A3

Refractory ceramic fibers** : 0.2 f/cc, A2

**Respirable fibers > 5μm aspect ratio ≥ 3:1 as determined by the membrane filter method at 400-450X magnification (4mm objective), using phase contrast illumination.

***Inhalable particulate matter. The concentration of inhalable particulate for the application of this TLV is to be determined from the fraction passing a size-selector with characteristics defined in Appendix C, paragraph A of the ACGIH TLV book.

A2 Suspected Human Carcinogen

A3 Confirmed Animal Carcinogen with Unknown Relevance to Humans

A4 Not Classifiable as a Human Carcinogen

NIOSH REL - TWA

Fibrous glass dust, Mineral wool fiber (synthetic vitreous fibers) 5 mg/m3 (total)
3 f/cm3 (fibers ≤ 3.5µm in diameter & ≥ 10μm in length)

State of California's Established PEL - TWA

Fibrous glass (as Glass) 1 f/cc(1)
Mineral wool fiber (as Particulates not otherwise regulated, or nuisance particulates)

5 mg/m3 (total dust)
10 mg/m3 (respirable fraction)(2)


(1) Fibers per cubic centimeter of air at 25°C and 760mm Hg pressure. To be considered a fiber for this limit the glass particle must be longer than 5µm, have a length to diameter ratio of three or more, and have a diameter less than 3μm. NIOSH Method 7400 (Issue 2, August 15, 1994) shall be used for measuring airborne fiber concentrations.

(2) The concentration and percentage of the particulate used for this limit are determined from the fraction passing a size selector with the following characteristics:

Aerodynamic Diameter in Micrometers
(unit density sphere)
Percent
Passing Selector
0 100
1 97
2 91
3 74
4 50
5 30
6 17
7 9
8 5
10 1
Back to Top

Thank You for Visiting Our Website

You are exiting the Department of Labor's Web server.

The Department of Labor does not endorse, takes no responsibility for, and exercises no control over the linked organization or its views, or contents, nor does it vouch for the accuracy or accessibility of the information contained on the destination server. The Department of Labor also cannot authorize the use of copyrighted materials contained in linked Web sites. Users must request such authorization from the sponsor of the linked Web site. Thank you for visiting our site. Please click the button below to continue.

Close