Salts & Minerals
REACH
Sodium metasilicate pentahydrate
CAS Number
10213-79-3
EC Number
600-021-3
What is Sodium metasilicate pentahydrate?
Sodium metasilicate pentahydrate (CAS 10213-79-3), also known as disodium metasilicate pentahydrate, is an alkaline silicate salt in a stable, water-soluble crystalline form.
Where is Sodium metasilicate pentahydrate used?
- Industrial and institutional cleaning: builder, binder and alkalinity source that boosts detergency
- Surface treatment: emulsifies oils and provides high pH to break down grease on metal and hard surfaces
- Textile and paper processing: scouring and desizing aid, with buffering capacity controlling bath alkalinity
- Construction and coatings: binder and adhesion promoter in cement-based products and refractory coatings
- Silicate paints and water treatment: corrosion inhibitor forming a protective silicate film on metal pipe surfaces to reduce scaling and metal leaching
Commercial specifications
- Technical grade, purity typically 97% or higher
- Bulk supply in bags or big bags
Other Names (Synonyms)
Silicic acid (H2SiO3), disodium salt, pentahydrate|Silicic acid, disodium salt, pentahydrate|DISODIUM METASILICATE PENTAHYDRATE|RefChem:885447|disodium;dioxido(oxo)silane;pentahydrate|Sodium silicate pentahydrate|Sodium silicate hydrate (Na2SiO3.5H2O)
What are the physical properties of Sodium metasilicate pentahydrate?
Melting Point 1088°C
Density 1.28 g/cm³ (liquid)
Color White
Odor odourless
Form Solid
Water Solubility Soluble in cold water.
Refractive Index 1.52
pH 12,5 (in aqueous solution: 10 g /l , 20 °C)
How is Sodium metasilicate pentahydrate classified and handled safely? Learn More
Danger
GHS05· Corrosive GHS07· Irritant GHS08· Health Hazard
Hazard Statements
H302 Harmful if swallowed
H314 Causes severe skin burns and eye damage
H318 Causes serious eye damage
H371 May cause damage to organs
Precautionary Statements
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
Which trade and regulatory codes apply to Sodium metasilicate pentahydrate?
HS Code 28391100
UN Number 3253
ADR Class 8
Packing Group III
Storage Class 8B - Non-combustible corrosive hazardous materials
WGK (Germany) 1