Agent Name

Sodium metasilicate pentahydrate

CAS Number

10213-79-3

Formula

H2-O3-Si.5H2-O.2Na

Major Category

Other Classes

Synonyms

Silicic acid, disodium salt, pentahydrate; [ChemIDplus] Disodium metasilicate pentahydrate; [Sigma-Aldrich MSDS] Disodium trioxosilicate, pentahydrate; [ERG] UN3253

Category

Salts, Basic

Description

Crystalline powder; [Reference #1] White solid; [Sigma-Aldrich MSDS]

Sources/Uses

Permitted for use as an inert ingredient in non-food pesticide products; [EPA] 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/wastewater treatment, enhanced oil recovery, and textile processing (bleach and dye stabilizing); [Reference #1] Generally regarded as safe (GRAS) by the FDA for use in fruit and vegetable washes, sanitizers for food-contact surfaces, and other indirect food contact uses; [NTP]

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 and lungs; Harmful by ingestion; [Sigma-Aldrich MSDS] See "Sodium metasilicate."

Reference Link

OECD SIDS: Soluble Silicates - 2004

Adverse Effects
Toxic Pneumonitis

Yes

Dermatotoxin

Skin Burns

Links to Other NLM Databases
Toxicity Information

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Chemical Information

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Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: