Sodium Metasilicate Anhydrous
Updated
Short answer
Sodium metasilicate anhydrous is the low-moisture Na₂SiO₃ grade, CAS 6834-92-0, used in dry-blend detergents, industrial cleaning and metal degreasing. Powder specification: Na₂O 50.0–51.5%, SiO₂ 45.0–48.0%, dry matter 95.0–98.5%. 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 Anhydrous, powder | Identity |
| Chinese Name | 无水偏硅酸钠 | Identity |
| CAS No. | 6834-92-0 | Identity |
| Chemical Formula | Na₂SiO₃ | Identity |
| Product code | SMA | Identity |
| Inspection basis | Q/ZZH 001-2026 | Specification |
| Na₂O | 50.0–51.5% | Specification |
| SiO₂ | 45.0–48.0% | Specification |
| Dry matter | 95.0–98.5% | Specification |
| Modulus (SiO₂/Na₂O molar ratio) | 0.91–0.98 | Specification |
| Bulk density | 1.05–1.35 g/cm³ | Specification |
| Particle size | Passing 425 μm (40 mesh) ≥90.0%. Passing 250 μm (60 mesh) ≥90.0%. | Specification |
| Whiteness | ≥90.0 | Specification |
| Iron (Fe) | ≤100 ppm | Typical |
| Water insoluble | ≤0.10% | Typical |
| pH (1.0% w/w aqueous solution, 25°C) | 12–13 | Typical |
| Appearance | White powder | 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 — 24 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, MSDS/SDS and ISO certificates are downloadable. EU REACH documentation on request is for CAS 6834-92-0 only and does not cover sodium metasilicate pentahydrate, CAS 10213-79-3. The shipment COA reports the specification rows. | 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 — 24 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 · CAS 6834-92-0
- SiO₂
- 45.0–48.0%
- Na₂O
- 50.0–51.5%
- Iron (Fe)
- Typical ≤100 ppm
- Packing
- 25 kg bags · 1,000 kg FIBC
- Documents
- COA · SDS · TDS · ISO · REACH (CAS 6834-92-0)
Product Overview
Anhydrous sodium metasilicate is the low-moisture Na₂SiO₃ grade selected for dry blend systems where water introduction should be minimized.
It is commonly reviewed for high-alkalinity detergent formulations, industrial cleaning compounds, metal degreasing systems, and selected processing applications that require stable dry material handling.
Before quotation, buyers should confirm Na₂O, SiO₂, Fe, moisture, appearance, particle size or bulk density requirements, packing method, storage conditions, MSDS / SDS, TDS and batch COA needs.
CAS 6834-92-0 · Na₂SiO₃
Uses
Powder detergent
Dry-blend detergent lines use anhydrous sodium metasilicate where added moisture has to stay low. Granules are the usual choice when the line needs free-flowing dosing.
Industrial cleaning
Industrial and institutional cleaner formulators use the anhydrous grade as a buffered alkaline builder in heavy-duty powders and degreasers.
Metal degreasing
Alkaline metal-degreasing and pretreatment baths review anhydrous sodium metasilicate for alkalinity, iron and insoluble matter before a grade is locked.
Grade Features
- Anhydrous powder for dry blends, with dry matter 95.0–98.5%
- Suitable for high-alkalinity industrial cleaning and detergent systems
- Specification rows are Na₂O, SiO₂, dry matter, modulus, bulk density, particle size and whiteness. Iron ≤100 ppm and water-insoluble matter ≤0.10% are typical.
- Particle size: passing 425 μm (40 mesh) ≥90.0% and passing 250 μm (60 mesh) ≥90.0%
- Shelf life is 12 months from the date of manufacture when stored in the original, unopened packaging under the recommended storage conditions.
Frequently Asked Questions
How fast can Zhongzhi Chemical quote anhydrous sodium metasilicate?
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 CAS 6834-92-0 only and does not cover sodium metasilicate pentahydrate, CAS 10213-79-3.
What is the difference between anhydrous and pentahydrate sodium metasilicate?
Anhydrous sodium metasilicate (Na₂SiO₃, CAS 6834-92-0) is specified at Na₂O 50.0–51.5%, SiO₂ 45.0–48.0% and dry matter 95.0–98.5%. Pentahydrate (Na₂SiO₃·5H₂O, CAS 10213-79-3) is specified at Na₂O 28–30%, SiO₂ 28–30% and dry matter 56–60%.
What is the SiO₂ and Na₂O content of anhydrous sodium metasilicate?
The powder specification is SiO₂ 45.0–48.0% and Na₂O 50.0–51.5%, with dry matter 95.0–98.5% and modulus 0.91–0.98. Iron is typical ≤100 ppm. Water-insoluble matter is typical ≤0.10%. Specification rows are reported on the COA.
Is anhydrous sodium metasilicate phosphate-free?
Yes. Sodium metasilicate is a phosphate-free alkaline builder, commonly used to replace or reduce phosphates such as STPP in laundry, dishwashing and industrial cleaning formulations.
How is anhydrous sodium metasilicate 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 24 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
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
Request a quotation
Sodium metasilicate anhydrous. 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