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DESCRIPTION
Sodium Metasilicate Anhydrous is a white, free-flowing granular or powdered inorganic compound produced by fusing high-purity silica sand and soda ash at temperatures above 1,100 °C. Unlike the pentahydrate form, the anhydrous version contains virtually no water of crystallization (<0.5% typical), offering superior stability, higher active alkalinity, and significantly better shelf life in humid environments.
| ITEM | SODIUM METASILICATE ANHYDRO GRANULAR | SODIUM METASILICATE ANHYDROUS POWDER | |
| SUPERIOR GRADE | NORMAL GRADE | - | |
| Na2O % | 51.00±1.00 | 51.00±1.00 | 50.00±1.00 |
| SiO2 % ≥ | 45.00 | 45.00 | 45.50±1.00 |
| Fe % ≤ | 0.015 | 0.02 | 0.015 |
| Bulk Density g/cm3 | 0.95-1.35 | 0.95-1.35 | 0.95-1.35 |
| Particle Size % | 18-60mesh ≥93.00 | 18-60mesh ≥93.00 | - |
| Whiteness ≥ | 85 | 80 | 90 |
| Water Insoluble % | 0.15 | 0.2 | - |
| Transparence ≥ | 80 | - | - |
PACKAGE & STORAGE
Protect from sun-scorched and rain-drenched. Send out the product in the sequence of stored-up date.
25kgs plastic weaves bag, 20MT/FCL with pallets.
APPLICATION
Industrial & Institutional Cleaning: Primary alkaline builder in heavy-duty detergents, ware-wash compounds, metal cleaners, and floor cleaners.
Textile Processing: Peroxide bleach stabilizer and detergent booster.
Ceramics & Cement: Deflocculant and binder in ceramic slips and refractory cements.
Water Treatment: Corrosion inhibitor for potable and industrial water systems.
Oilfield & Drilling: Component of high-pH drilling fluids.
Pulp & Paper: Peroxide stabilizer in de-inking and bleaching processes.
Adhesives & Sealants: High-temperature binder for cardboard and foundry cores.
Frequently Asked Questions (FAQs)
Q: What is the difference between sodium metasilicate anhydrous and pentahydrate?
A: Anhydrous contains <0.5% moisture and ≈51% Na₂O, while pentahydrate (Na₂SiO₃·5H₂O) contains ~42% water of crystallization and only ≈29% Na₂O. Anhydrous is preferred when maximum alkalinity, stability, or cost-per-active-kilo is required.
Q: Is Sodium Metasilicate Anhydrous the same as "water glass" in solid form?
A: Yes. "Water glass" usually refers to liquid sodium silicate solutions, but the anhydrous granular form is the solid equivalent with a 1:1 Na₂O:SiO₂ ratio.
Q: Can it be used in automatic ware-wash dispensers?
A: Yes, the granular anhydrous form dissolves rapidly and is widely used in solid dishwasher detergents and institutional ware-wash compounds.
Q: Is it safe for aluminum and soft metals?
A: No. Sodium metasilicate is highly alkaline (pH >12.5) and will etch or corrode aluminum, zinc, and tin at typical use concentrations. Use sodium silicate with higher SiO₂ ratios (2.0–3.2) or add silicate inhibitors for aluminum-safe formulations.
Q: Is it biodegradable or environmentally friendly?
A: Sodium metasilicate is inorganic and does not biodegrade, but it is readily neutralized in wastewater treatment and does not persist in the environment. It is phosphate-free and helps reduce eutrophication compared to STPP.
Q: Where can I buy high-quality Sodium Metasilicate Anhydrous?
A: You can contact us via Email mandy@czqidi.com or WhatsApp +86-18452425579 for offers and bulk orders.
