Sodium Metasilicate Pentahydrate
Updated
Short answer
Sodium metasilicate pentahydrate is the hydrated grade, Na₂SiO₃·5H₂O, CAS 10213-79-3, used in cleaning products, textile auxiliaries and water-treatment blends. It is specified at Na₂O 28–30%, SiO₂ 28–30% and dry matter 56–60%. Zhongzhi Chemical supplies it factory-direct in 25 kg bags or 1,000 kg FIBCs, FOB Qingdao, with 10+ years exporting and customers worldwide.
Key Specifications
Published TDS for this grade. Confirm the rows against the 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 |
| Product code | SMP | Identity |
| Inspection basis | Q/ZZH 001-2026 | Specification |
| Na₂O | 28–30% | Specification |
| SiO₂ | 28–30% | Specification |
| Dry matter | 56–60% | Specification |
| Modulus (SiO₂/Na₂O molar ratio) | 0.95–1.02 | Specification |
| Bulk density | 0.85–1.00 g/cm³ | Specification |
| Particle size, granular | 250–1400 μm (60–14 mesh) ≥95.0%. Granules: pass coarse sieve / retain fine sieve. | Specification |
| Particle size, powder | Passing 600 μm (30 mesh) ≥90.0%. Passing 250 μm (60 mesh) ≥15.0%. | Specification |
| Whiteness, granular | ≥85.0 | Specification |
| Whiteness, powder | ≥90.0 | Specification |
| Iron (Fe) | ≤80 ppm | Typical |
| Water insoluble | ≤0.06% | Typical |
| pH (1.0% w/w aqueous solution, 25°C) | 12–13 | Typical |
| Appearance, granular | White granules | Typical |
| Appearance, powder | White powder | Typical |
| Melting point | 72–73°C | Typical |
| Packing | 25 kg PP woven bag with PE liner; 1,000 kg FIBC / jumbo bag | Handling |
| Loading without pallets | 25 kg — 27 mt / 20 FCL | Handling |
| Loading on pallets | 25 kg — 22 mt / 20 FCL; 1,000 kg — 20 mt / 20 FCL | Handling |
| Shelf life | 12 months from the date of manufacture when stored in the original, unopened packaging under the recommended storage conditions. | Handling |
| Storage | Keep tightly closed in a cool, dry, ventilated warehouse; protect from moisture and keep away from acids. | Handling |
| Documents Available | TDS, SDS and a representative COA are available for buyer review. The shipment COA reports the specification rows. EU REACH and Only Representative coverage are subject to a separate compliance review. | Documents |
Packing and port
Select packing according to handling method, container loading plan, and storage conditions.
- 25 kg PP woven bag with PE liner
- 1,000 kg FIBC / jumbo bag
- Loading without pallets: 25 kg — 27 mt / 20 FCL
- Loading on pallets: 25 kg — 22 mt / 20 FCL; 1,000 kg — 20 mt / 20 FCL
- Keep tightly closed in a cool, dry, ventilated warehouse; protect from moisture and keep away from acids.
Packing is a 25 kg PP woven bag with PE liner, or a 1,000 kg FIBC. Full-container orders are quoted FOB Qingdao. Below one full container the sale is EXW, collected from the plant. Minimum order is 1 tonne.
Key Facts
- Chemical Identity
- Na₂SiO₃·5H₂O · CAS 10213-79-3
- SiO₂
- 28–30%
- Na₂O
- 28–30%
- Iron (Fe)
- Typical ≤80 ppm
- Powder, passing 250 μm (60 mesh)
- ≥15.0%
- Packing
- 25 kg bags · 1,000 kg FIBC
- Documents
- TDS · SDS · representative COA · EU REACH by separate review
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.
SDS and a representative COA are available for buyer review. Batch-specific COA and a controlled TDS are confirmed against the selected grade. EU REACH status and importer coverage must be confirmed separately against the requested substance identity, supply chain, annual tonnage and importer legal entity. Please request a compliance review before quotation.
CAS 10213-79-3 · Na₂SiO₃·5H₂O
Custom Powder Specification Review
Buyers may specify a target bulk density, particle-size distribution, D10/D50/D90, mean particle size, dissolution behavior and dust requirement for pentahydrate powder.
Mesh passing data must not be treated as equivalent to a D50 or a mean particle size. A result such as passing 30 mesh (600 µm) or passing 60 mesh (250 µm) does not establish those particle-size statistics, and a granular COA is not evidence for a powder grade.
Custom specifications are subject to factory feasibility testing and sample approval. A target specification is not considered available until it is confirmed by a controlled TDS and a matching batch COA.
Before requesting a quotation
Send the items below with the RFQ on this site. Published standard-grade limits stay as published; a buyer target is reviewed separately and is not a confirmed factory specification until the controlled TDS and batch COA say so.
EU REACH status and importer coverage must be confirmed separately against the requested substance identity, supply chain, annual tonnage and importer legal entity. Please request a compliance review before quotation.
- Required CAS and hydration state
- Na₂O and SiO₂ specification
- Bulk-density range and test method
- D10/D50/D90 or required mean particle size
- Annual quantity
- Packing
- Destination port
- Importer legal name
- Required SDS, TDS, COA and regulatory documents
Uses
Cleaning products
Household and institutional cleaning products use pentahydrate where a hydrated crystal and controlled dissolution suit the make-up.
Textile processing
Textile scouring and bleach-auxiliary producers use sodium metasilicate where controlled alkalinity supports fiber cleaning.
Water treatment
Water-treatment blends use pentahydrate in pH adjustment packages and equipment-cleaning formulations.
Metal cleaning
Metal-cleaning preparations specify pentahydrate when controlled dissolution matters more than the lowest moisture.
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
- An RFQ should name hydration state, physical form, target bulk density and particle size if they matter, packing, destination port, annual quantity and the importer legal name
- SDS and a representative COA can be reviewed before order; batch-specific COA and a controlled TDS follow the selected grade
Frequently Asked Questions
How fast can Zhongzhi Chemical quote sodium metasilicate pentahydrate?
The export team replies within 12 hours. Send application, monthly quantity, packing and destination port. Grade is optional. Full-container orders are quoted FOB Qingdao. The published EU REACH file covers disodium metasilicate, CAS 6834-92-0, and is not evidence for sodium metasilicate pentahydrate, CAS 10213-79-3. Request a compliance review before quotation.
Is sodium metasilicate pentahydrate (CAS 10213-79-3) already covered by the published EU REACH file?
No. The published EU REACH file refers to disodium metasilicate, CAS 6834-92-0. It must not be presented as evidence of registration or importer coverage for sodium metasilicate pentahydrate, CAS 10213-79-3. EU REACH status and importer coverage must be confirmed separately against the requested substance identity, supply chain, annual tonnage and importer legal entity. Please request a compliance review before quotation.
Why is the SiO₂ content of pentahydrate lower than the anhydrous grade?
Pentahydrate dry matter is 56–60%, which is Na₂O plus SiO₂. The specification is Na₂O 28–30% and SiO₂ 28–30%. Anhydrous dry matter is 95.0–98.5%, with Na₂O 50.0–51.5% and SiO₂ 45.0–48.0%.
What is the CAS number and formula of sodium metasilicate pentahydrate?
It is Na₂SiO₃·5H₂O, CAS 10213-79-3, specified at Na₂O 28–30% and SiO₂ 28–30%. Iron is typical ≤80 ppm. 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?
Packing is a 25 kg PP woven bag with PE liner, or a 1,000 kg FIBC / jumbo bag. Without pallets, 25 kg bags load at 27 mt per 20-foot container. On pallets, 25 kg bags load at 22 mt and 1,000 kg bags at 20 mt. Shelf life is 12 months from the date of manufacture when stored in the original, unopened packaging under the recommended storage conditions.
Product documents for buyer review
SDS and a representative COA are available for buyer review. Batch-specific COA and a controlled TDS are confirmed against the selected grade. EU REACH and Only Representative coverage are subject to a separate compliance review.
RFQ information needed
- Grade
- Monthly quantity (MT)
- Application
- Buyer type
- Packing
- Destination port
Request a quotation
Sodium metasilicate pentahydrate. Send application, monthly quantity, packing and destination port. Grade is optional. The export team replies within 12 hours.
- Grade
- Monthly quantity (MT)
- Packing
- Destination port
- Documents needed