Sodium Metasilicate Pentahydrate
Pentahydrate grade information for buyers reviewing Na₂SiO₃·5H₂O, packing, documents, and RFQ details — send grade and monthly quantity (MT) for quotation.
Grade specification page. View sodium metasilicate product overview →
Updated
Short answer
- Sodium metasilicate pentahydrate (Na₂SiO₃·5H₂O, CAS 10213-79-3) is the hydrated crystalline grade, supplied in two tiers: Superior at Na₂O ≥28.7%, SiO₂ ≥27.8% and Fe ≤0.008% (granular), Standard at Na₂O ≥28.5%, SiO₂ ≥27.5% and Fe ≤0.015%.
- The assay reads lower than the anhydrous grade because roughly 42% of its mass is water of crystallization — on a water-free basis the two are equivalent — and it is specified where a milder, controlled dissolution profile suits the make-up method, as in cleaning products, water-treatment blends and textile auxiliaries.
- Zhongzhi Chemical manufactures and exports it from China in 25 kg PP woven bags with PE liner, 50 kg bags and 1,000 kg FIBCs, with COA, SDS and REACH documentation available for buyer review.
Key Facts
- Chemical Identity
- Na₂SiO₃·5H₂O · CAS 10213-79-3
- SiO₂ Content
- Superior ≥ 27.8% · Standard ≥ 27.5%
- Na₂O Content
- Superior ≥ 28.7% · Standard ≥ 28.5%
- Iron (Fe)
- Superior ≤ 0.008% · Standard ≤ 0.015%
- Packing
- 25 kg bags · 1,000 kg FIBC
- Documents
- COA · SDS · ISO · REACH
Product Overview
Sodium metasilicate pentahydrate is a hydrated crystalline Na₂SiO₃·5H₂O grade used where a crystal or hydrated metasilicate form is preferred for formulation and handling.
Common purchasing scenarios include cleaning products, textile auxiliaries, water treatment blends, metal cleaning preparations, and distributors that need hydrate-grade documentation before placing orders.
Before quotation, send grade (pentahydrate) and monthly quantity (MT), and confirm CAS 10213-79-3, Na₂O, SiO₂, Fe, water insoluble matter, appearance, particle size, packing, storage conditions, and document requirements. Approved TDS, SDS and stamped COA samples are on Downloads; a shipment COA is issued per order.
CAS 10213-79-3 · Na₂SiO₃·5H₂O
Key Specifications
Confirm final values against your target grade and order specification before quotation.
| Property | Value | Basis |
|---|---|---|
| Product Name | Sodium Metasilicate Pentahydrate | Identity |
| Chinese Name | 五水偏硅酸钠 | Identity |
| CAS No. | 10213-79-3 | Identity |
| Chemical Formula | Na₂SiO₃·5H₂O | Identity |
| Molecular Weight | 212.14 g/mol | Identity |
| Appearance | White crystalline granules or powder | Published spec |
| SiO₂ Content | Superior ≥ 27.8% · Standard ≥ 27.5% | Published spec |
| Na₂O Content | Superior ≥ 28.7% · Standard ≥ 28.5% | Published spec |
| Fe Content | Superior ≤ 0.008% granular / ≤ 0.010% powder · Standard ≤ 0.015% | Published spec |
| Bulk Density | Superior 0.85 · Standard 1.0 g/cm³ | Published spec |
| Particle Size | Granular 14–60 mesh · Powder pass 30 mesh ≥ 90.0% | Published spec |
| Whiteness | Superior ≥ 80 granular / ≥ 85 powder · Standard ≥ 75 | Published spec |
| Melting Point | 72.2 °C | Identity |
| Water Insoluble | Superior ≤ 0.03% granular / ≤ 0.06% powder · Standard ≤ 0.10% | Published spec |
| pH (1% solution) | Strongly alkaline; confirm by TDS | On request |
| Storage | Keep sealed and dry; avoid moisture absorption | Handling |
| Documents Available | MSDS/SDS, ISO certificates and product brochure downloadable; REACH documentation and batch-specific COA & TDS on request | Documents |
Applications
- Household and institutional cleaning product formulations
- Water treatment chemical blends requiring hydrated metasilicate review
- Textile scouring and bleaching auxiliary formulations
- Metal cleaning preparations where controlled dissolution is required
- Distributor supply for buyers specifying CAS 10213-79-3 pentahydrate grade
Packaging Options
Select packing according to handling method, container loading plan, and storage conditions.
- 25 kg PP woven bags with PE liner for standard export orders
- 50 kg woven bags with PE liner by order requirement
- 1,000 kg jumbo bags (FIBC) for bulk procurement review
- Neutral bag, printed bag, palletized or non-palletized loading can be confirmed before quotation
- Store sealed and dry; avoid moisture exposure during storage and transport
Grade Features
- Hydrated Na₂SiO₃·5H₂O grade for buyers specifying pentahydrate material
- Crystalline appearance and dissolution behavior should be confirmed by selected grade specification
- Suitable for selected cleaning, textile and water treatment formulation reviews
- RFQ should include required hydrate grade, particle size or appearance needs, packing and destination port
- MSDS / SDS, TDS and batch-specific COA can be requested according to order requirements
Frequently Asked Questions
Why is the SiO₂ content of pentahydrate lower than the anhydrous grade?
Pentahydrate (Na₂SiO₃·5H₂O) carries five water molecules of crystallisation — roughly 42% of its mass is water — so the assay reads lower at Na₂O ≥28.5% and SiO₂ ≥27.5% (Standard tier). On a water-free basis it is equivalent to the anhydrous grade; the difference is water content, not purity.
What is the CAS number and formula of sodium metasilicate pentahydrate?
It is Na₂SiO₃·5H₂O, CAS 10213-79-3, supplied at Na₂O ≥28.5%, SiO₂ ≥27.5% and Superior-grade iron ≤0.008%. This is a distinct CAS from the anhydrous grade (6834-92-0), so state the pentahydrate CAS on your order to avoid a grade mismatch.
When should I choose pentahydrate instead of anhydrous?
Choose pentahydrate where a milder, more controlled dissolution suits the make-up method — common in household and institutional cleaners, textile scouring auxiliaries and water-treatment blends. Choose anhydrous where added moisture must be minimised, as in dry-blend detergents and degreasers.
How is pentahydrate packed and what is the MOQ?
Standard export packing is 25 kg PP woven bags with PE liner, with 50 kg bags or 1,000 kg FIBCs by request, kept sealed and dry against moisture pickup. Minimum order quantity and lead time are confirmed on RFQ against your destination and grade.
Product documents for buyer review
Download available MSDS, certificates, product brochure and company documents, or request batch-specific COA / TDS / SDS for your order.
RFQ information needed
- Grade
- Monthly quantity (MT)
- Application
- Buyer type
- Packing
- Destination port
Ready to RFQ pentahydrate
Grade pre-selected as pentahydrate — add monthly MT, packing, port and buyer type.
- Grade
- Monthly quantity (MT)
- Packing
- Destination port
- Documents needed