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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
  • Chemical Abstracts Service (CAS) Registry Number: 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 of Chemical Substances (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):
  • 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:
  • See Particulates not otherwise regulated (Total Dust)
  • Amorphous Silica does not diffract x-rays; evaluate gravimetically. Submit respirable sample to the Salt Lake Technical Center (SLTC) for quartz analysis. See Silica, Crystalline Quartz (as Quartz), Respirable Dust.

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