Agent Name

Sodium metasilicate nonahydrate

CAS Number

13517-24-3

Formula

H2-O3-Si.9H2-O.2Na

Major Category

Metals

Synonyms

Silicic acid (H2SiO3), disodium salt, nonahydrate; [ChemIDplus] Disodium metasilicate nonahydrate; [Sigma-Aldrich MSDS] UN3253

Category

Metals, Inorganic Compounds

Description

Efflorescent solid; [Merck Index] Hygroscopic solid; [Sigma-Aldrich MSDS]

Sources/Uses

Used as a starting material for zeolites and silica catalysts, as an adhesive and binder, corrosion inhibitor, penetrating sealant, fireproofing agent (wood, paper, and fabric), detergent booster, and shell coating material to preserve eggs; Also used in cements, drilling fluids, and waste water treatment; [Merck Index] Alkali metal silicates are used as starting materials for products like silicas and zeolites, in detergents and cleaners, and pulp and paper production; Also used to a lesser extent in soil stabilization and sealing, adhesives and binders (construction materials, paperboard and cardboard, ceramic binders, refractories, welding rods, and foundry molds and cores), surface coatings (titanium dioxide production, paints for masonry and glass, and spray coatings for tunnel construction and mining), water treatment (corrosion protection), enhanced oil recovery, and textile processing (bleach and dye stabilizing); [Reference #1]

Comments

Corrosive to moistened rabbit skin; Sodium metasilicate was not sensitizing in a local lymph node assay study of mice; Similar uses and adverse effects are expected from the hydrous and anhydrous forms (Sodium metasilicate pentahydrate, Sodium metasilicate nonahydrate, Sodium metasilicate, Sodium silicate, and Potassium silicate). One case of occupational contact urticaria reported from sodium silicate; [Reference #1] Causes burns; Inhalation may cause corrosive injuries to upper respiratory tract; [Sigma-Aldrich MSDS] See "Sodium metasilicate."

Reference Link

OECD SIDS: Soluble Silicates - 2004

Exposure Assessment
Explanatory Notes

The Guide in the Emergency Response Guidebook is for "Disodium trioxosilicate."

Adverse Effects
Dermatotoxin

Skin Burns

Links to Other NLM Databases
Toxicity Information

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Chemical Information

Search ChemIDplus

Related Information in HazMap
Processes

Industrial Processes with risk of exposure: