 |
Chemical Sampling Information |
|
| Silica, Amorphous, Precipitated and Gel |
|
General Description
Synonyms: Diatomaceous earth; Diatomaceous silica; Diatomite; Silicon dioxide (amorphous); Vitreous silica
OSHA IMIS Code Number: 9050
IMIS Name History: Silica (amorphous) prior to 9/1/89
Related Chemical Abstracts Service (CAS) Registry Numbers: 7631-86-9 (Silica, Amorphous); 7699-41-4 (Silica, Gel); 60676-86-0 (Vitreous silica); 61790-53-2 (Diatomaceous earth (uncalcined)); 68855-54-9 (Flux-calcined diatomaceous earth); 112926-00-8 (Precipitated silica; silica gel); 112945-52-5 (Pyrogenic (fumed) amorphous silica)
NIOSH, Registry of Toxic Effects (RTECS) Identification Number: VV7310000
NIOSH Pocket Guide to Chemical Hazards, Silica, Amorphous: chemical description, physical properties, potentially hazardous incompatibilities, and more
Exposure Limits
OSHA Permissible Exposure Limit (PEL) for General Industry: 29 CFR 1910.1000 Z-3 Table -- 20 mppcf, 80 mg/m3/%SiO2 TWA (PEL listed under Silica, Amorphous, including natural diatomaceous earth)
OSHA Permissible Exposure Limit (PEL) for Construction Industry: 29 CFR 1926.55 Appendix A -- 20 mppcf TWA (PEL listed under Silica, Cristobalite, Amorphous, including natural diatomaceous earth)
OSHA Permissible Exposure Limit (PEL) for Maritime: 29 CFR 1915.1000 Table Z-Shipyards - Mineral Dusts -- 20 mppcf TWA (PEL listed under Silica, Cristobalite, Amorphous, including natural diatomaceous earth)
National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 6 mg/m3 TWA; Appendix C - Supplementary Exposure Limits (Mineral Dusts)
Health Factors
Monitoring Methods used by OSHA
Laboratory Sampling/Analytical Method:
-
note: See Particulates not otherwise regulated (Total Dust)
note: Amorphous Silica does not diffract x-rays; evaluate gravimetically. Submit respirable sample to SLTC for quartz analysis. See Silica, Crystalline Quartz (as Quartz), Respirable Dust.
* All Trademarks are the property of their respective owners.
|
|
|
|
 |
|
Back to Top
www.osha.gov
