Skip Navigation
ChemIDplus A TOXNET DATABASE LiteBrowseAdvanced

Substance Name: Hydrated silica
RN: 112926-00-8


  • Synthetic amorphous silica (silicon dioxide) is produced by a wet process by reacting an aqueous alkali metal silicate solution and a mineral acid. An extensive hydrated silica structure, or "gel" is formed which is then dried. A precipitated silica is also produced in a "wet" process in a finely-divided, hydrated form by precipitation from aqueous alkali metal silicate solutions. This product contains no detectable crystalline silica.

Classification Codes

Classification Code

  • Tumor Data

Superlist Classification Codes

  • Overall Carcinogenic Evaluation: Group 3
  • TWA 10 mg/m3
  • TWA 20 mg/m3; Ceiling (80 mppcf)/%SiO2 mg/m3;
* denotes mobile formatted website

Links to Resources

NLM Resources (File Locators)

Regulatory Agencies (Superlist Locators)

Other Resources (Internet Locators)

Names and Synonyms

Name of Substance

  • Hydrated silica
  • Precipitated silica
  • Silica gel
  • Silica hydrate


  • EC 231-545-4
  • Precipitated silica

Systematic Names

  • Silica gel, pptd., cryst.-free
  • Silica, amorphous, precipitated and gel
  • Silicon dioxide

Superlist Names

  • Amorphous silica, Precipitated silica
  • Precipitated silica and silica gel
  • Silica gel, pptd., cryst.-free
  • Silica, amorphous
  • Silica, amorphous, precipitated and gel
  • Silica, Precipitated

Registry Numbers

CAS Registry Number

  • 112926-00-8

System Generated Number

  • 0112926008