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Sodium Metasilicate Pentahydrate

Sodium Metasilicate Pentahydrate

Basic Information

CAS No.: 10213-79-3
Molecular Formula: H5NaO4Si
Molecular Weight: 120.11

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Product Details

Sodium Metasilicate Pentahydrate is a white crystalline solid with strong alkalinity and good dispersibility. It is widely used in heavy-duty detergents, metal cleaning, textile pretreatment, ceramics, and industrial cleaning formulations.


Chemical Properties

PropertyValue
Melting point1088°C
Density2.61
Refractive index1.52
Storage conditionStore at room temperature
FormSolid
ColorWhite
OdorOdorless
pH value12.5 (in aqueous solution: 10 g/L, 20°C)
Water solubilitySoluble in cold water.
Merck14,8642
InChI1S/2Na.O3Si.5H2O/c;1-4(2)3;;;;;;/h;;;;5*1H2/q2+1;-2;;;;;;
InChIKeyADPGGKZKXGXANON-UHFFFAOYSA-N
SMILESO.O.O.O.[Na+].[Na+].[O-]Si=O
CAS database10213-79-3 (CAS DataBase Reference)
EPA chemical substance informationSilicic acid (H₂SiO₃), disodium salt, pentahydrate (10213-79-3)


Product Usage

Sodium Metasilicate Pentahydrate is a versatile inorganic salt that integrates cleaning, buffering, emulsifying, and anti-corrosive properties. In the detergent industry, it is a core component for high-performance laundry powders, dishwashing liquids, and industrial cleaners, serving as an eco-friendly alternative to STPP to enhance detergency. In metal surface treatment, it is widely used for metal cleaning and corrosion inhibition, forming a protective film on metal surfaces to suppress acidic erosion. Additionally, it acts as a highly effective dispersant for slurry deflocculation in the ceramic industry and serves as a scouring and bleaching auxiliary in textile dyeing. In the petroleum and construction sectors, it plays a vital role as a mud consistency controller and a concrete accelerator.

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