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Chemical Sampling Information (CSI)
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General Description

Synonyms: Silicic Acid (H2Si03) Disodium Salt; Crystamet; Disodium Metasilicate; Disodium Monosilicate; Orthosil; Metso Beads, Drymet; Sodium Metasilicate, Anhydrous; Sodium Silicate; Water Glass

OSHA IMIS Code Number: S245

Chemical Abstracts Service (CAS) Registry Number: 6834-92-0

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: VV9275000

Chemical Description and Physical Properties:

Usually obtained as a glass; also orthorhombic crystals. Usually prepared from sand (SiO2) and soda ash (NaCO3) by fusion. Soluble in cold water, hydrolyzed by hot water. Insoluble in alcohol, acids, salt solutions.
molecular weight: 122.07
molecular formula: O3Si•2Na
melting point: 1089°C

Health Factors

Health Effects: Severe skin irritation; inhalation of dusts can irritate upper respiratory tract.

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • note: Call the Salt Lake Technical Center for instructions.

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