Sodium metasilicate
- CAS No.
- 6834-92-0
- Chemical Name:
- Sodium metasilicate
- Synonyms
- Na2SiO3;DISODIUM TRIOXOSILICATE;Disodium metasilicate;WATER GLASS;Sodium metasilicate, anhydrous;Sodium Metasilicate Pentahydrat;SILICA STANDARD;shuiboli;sodiummetasilicate(na2sio3);B-W
- CBNumber:
- CB2199386
- Molecular Formula:
- Na2O3Si
- Molecular Weight:
- 122.06
- MDL Number:
- MFCD00003492
- MOL File:
- 6834-92-0.mol
- MSDS File:
- SDS
- TDS File:
- TDS
| Melting point | 1089°C |
|---|---|
| Density | 2.4 |
| refractive index | nD25 (glass) 1.520 |
| solubility | soluble in cold H2O; reachot H2O; insoluble in ethanol |
| form | powder |
| Specific Gravity | 2.61 |
| color | White |
| PH | 11(1 mM solution);11.91(10 mM solution);12.62(100 mM solution) |
| Water Solubility | Soluble in cold water. Hydrolyzes in hot water. Insoluble in acids, alcohol and salt solutions. |
| Hydrolytic Sensitivity | 0: forms stable aqueous solutions |
| Merck | 14,8642 |
| Stability | hygroscopic |
| Cosmetics Ingredients Functions |
BUFFERING ANTICORROSIVE CHELATING |
| InChI | 1S/2Na.O3Si/c;;1-4(2)3/q2*+1;-2 |
| InChIKey | NTHWMYGWWRZVTN-UHFFFAOYSA-N |
| SMILES | [Na+].[Na+].[O-][Si]([O-])=O |
| CAS DataBase Reference | 6834-92-0(CAS DataBase Reference) |
| Substances Added to Food (formerly EAFUS) | SODIUM METASILICATE |
| FDA 21 CFR | 173.310; 184.1769a |
| EWG's Food Scores | 3 |
| FDA UNII | 052612U92L |
| NIST Chemistry Reference | Sodium silicate(6834-92-0) |
| EPA Substance Registry System | Sodium metasilicate (6834-92-0) |
| UNSPSC Code | 12352302 |
| NACRES | NA.22 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |   GHS05,GHS07 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H314-H335 | |||||||||
| Precautionary statements | P260-P264-P280-P261-P271-P301+P330+P331-P303+P361+P353-P363-P304+P340-P310-P305+P351+P338-P312-P405-P403+P233-P501 | |||||||||
| target organs | Respiratory system | |||||||||
| PPE | Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges | |||||||||
| Hazard Codes | C | |||||||||
| Risk Statements | 36/37/38-37-34 | |||||||||
| Safety Statements | 26-45-36/37/39-13-24/25 | |||||||||
| RIDADR | UN 3253 | |||||||||
| WGK Germany | 1 | |||||||||
| RTECS | VV9275000 | |||||||||
| F | 3 | |||||||||
| TSCA | TSCA listed | |||||||||
| HazardClass | 8 | |||||||||
| PackingGroup | III | |||||||||
| HS Code | 28391910 | |||||||||
| Storage Class | 8B - Non-combustible corrosive hazardous materials | |||||||||
| Hazard Classifications | Eye Dam. 1 Met. Corr. 1 Skin Corr. 1B STOT SE 3 |
|||||||||
| Hazardous Substances Data | 6834-92-0(Hazardous Substances Data) | |||||||||
| REACH Registrations | Active | |||||||||
| Limited Quantities | 5.0 kg (11 lbs) (solid) | |||||||||
| Excepted Quantities | Max Inner Pack (30g or 30ml) and Max Outer Pack (1Kg or 1L) | |||||||||
| NFPA 704 |
|
Sodium metasilicate price More Price(20)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | 307815 | Sodium metasilicate | 6834-92-0 | 25g | $56 | 2026-04-30 | Buy |
| Sigma-Aldrich | 307815 | Sodium metasilicate | 6834-92-0 | 1kg | $72.9 | 2026-04-30 | Buy |
| Strem Chemicals | 93-1196 | Sodium metasilicate, anhydrous, min. 95% min.95% | 6834-92-0 | 500g | $49 | 2026-04-30 | Buy |
| Strem Chemicals | 93-1196 | Sodium metasilicate, anhydrous, min. 95% min.95% | 6834-92-0 | 2kg | $152 | 2026-04-30 | Buy |
| Usbiological | 289362 | Sodium Metasilicate | 6834-92-0 | 1Kg | $303 | 2026-06-03 | Buy |
Sodium metasilicate Chemical Properties,Uses,Production
Overview
Sodium metasilicate is a type of silicic acid salt and is classified as an inorganic salt products, and its molecular formula is Na2SiO3•nH2O. It is a non-toxic, odorless and harmless white powder or crystalline particle. It is soluble in water, but not in alcohols or acids. Its aqueous solution is alkaline and is capable of hygroscopy and deliquescence when in contact with air. It has purifying, emulsifying, dispersing, moistening, permeating and PH buffering abilities. Sodium metasilicate is a low molecular weight crystal that results from the heat reaction between foaming alkaline and caustic soda water. Products include anhydrous, pentahydrate and nonahydrate compounds.
Among inorganic electrolytes, sodium metasilicate’s active alkalinity and PH buffering index is the highest. It has strong moistening, emulsifying and saponifying effect on fats. It is excellent at eliminating, dispersing and suspending impurities, and it can prevent impurities from recollecting. It has strong cleansing, buffering and neutralizing abilities, can emulsify fats and oils, is an anti-flocculant for inorganic matter, protects metals from erosion, can replace sodium tripolyphosphate in producing detergents and metal cleansing agents, thus reducing the environmental pollution of sodium tripolyphosphate.
Sodium metasilicate is widely used in laundry detergent, ceramics, plating, textiles, printing, papermaking, concrete, cement, fireproof materials, oils, leather processing, and many other industrial fields. Currently, the industries that use it the most are: ceramics, industrial cleaning, laundry detergent, concrete, printing, papermaking, cement, oil mining, etc.
Identifying tests
Dissolve a 200mg sample in 10ml water and dispense a drop of this liquid onto a color palette. Add 1 drop of 4mol/L sodium hydroxide and one drop of a solution of 0.5g of ammonium molybdate in 10ml water. Then add 3ml sulfuric acid, and it should turn dark yellow to indicate the presence of silicate. Dip a nichrome wire into the test solution of experiment 1 and place it in a flame; it should turn bright yellow to indicate the presence of sodium.
Content Analysis
Take a 1g sample of silica, place it in a beaker, use 5ml hydrochloric acid to acidify it, and evaporate on a steam bath until dry. Then add another 5ml hydrochloric acid and repeat the steps once. Mix the remainder with 1ml hydrochloric acid and 2ml water, hydrolyze into a soluble salt on the steam bath, and strain through a quantitative analysis filter paper. After rinsing with hot water, move to a platinum crucible and dry for 1h at 105℃, and use a lower temperature to carbonize. Then burn at 1000℃ until it maintains a constant weight. Use a few drops of water to moisten the remainder, and then add 15ml hydrofluoric acid and 5 drops of 1:3 sulfuric acid. After removing the acid on a hot plate, burn at 1000℃ until it maintains a constant weight.
Toxicity
Corrosive; do not contact with eyes, skin or clothes, and do not inhale its vapor.
GRAS(GMP；FDA，§184.1769a，2000).
Chemical Properties
White, granular powder. Soluble in water; p H of 1% solution 12.7. Noncombustible.
Chemical Properties
The metasilicates are highly water soluble, but insoluble in alcohol, acid, and salt solutions. Solutions of sodium metasilicate, when heated or acidified, are hydrolyzed to free sodium ions and silicic acid. In moist air, they are corrosive to metals, including zinc, aluminum, tin, and lead, forming hydrogen gas. They are all strong bases reacting violently with acid.
Uses
The various hydrates of sodium metasilicate are used in soap, detergent, and bath/washing products. They also have a major use as a builder (a material that enhances or maintains the cleaning efficiency of the surfactant, principally by inactivating water hardness) in soaps and detergents. They are also used as an anticorrosion agent in boiler-water feeds.
Uses
Sodium Metasilicate is an antibacterial pharmaceutical compound containing Sodium Hydrogen Carbonate.
Uses
Laundry, dairy, and metal cleaning; floor clean- ing; base for detergent formulations; bleaching aid; deinking paper. Also available as the pentahydrate whose properties are mp 72.2C, total Na 2 O content 29.3%, total Na 2 O in active form 27.8%, d 1.75 or 55 lb/cu ft.
Definition
A crystalline silicate.
Hazard
Toxic by ingestion, protective clothing required.
Flammability and Explosibility
Not classified
Safety Profile
Poison by ingestion and intraperitoneal routes. A caustic material whch is a severe eye, sktn, and mucous membrane irritant. Experimental reproductive effects. Ingestion causes gastrointestinal tract upset. Violent reaction with F2. When heated to decomposition it emits toxic fumes of Na2O. Used in cosmetics. See also SILICATES.
Synthesis
Crystalline sodium metasilicate is produced via solid-state reaction by calcining stoichiometric mixtures of silica (from commercial sand or rice husk ash) with sodium bicarbonate, sodium carbonate, or sodium hydroxide at temperatures ranging from 900 to 1400 ºC[1][2][3]. Alternatively, the compound is synthesized through precipitation from aqueous solutions of tetraethyl orthosilicate and sodium hydroxide, or by autoclaving silica and sodium hydroxide at 180–240 ºC under pressure[1][3]. Hydrated forms (Na2SiO3·5H2O, Na2SiO3·6H2O, Na2SiO3·8H2O) and anhydrous sodium metasilicate are obtained by controlling the drying modulus of the liquor, with anhydrous product specifically gained by drying at 120 ºC[2].
Purification Methods
Crystallise it from aqueous 5% NaOH solution. [Schwartz Z Anorg Allgem Chem 126 62 1923.]
References
[1] Tejeda-Ochoa et al. Revista Mexicana de Ingeniería Química Vol. 18, No. 2 (2019) 581-588.
[2]Liu, X., Li, Z., Chen, H., Yang, L., Tian, Y., & Wang, Z. (2015). Rice husk ash as a renewable source for synthesis of sodium metasilicate crystal and its characterization. Research on Chemical Intermediates, 42(4), 3887–3903. https://doi.org/10.1007/s11164-015-2251-7
[3]Rodríguez, M. T., & Pfeiffer, H. (2008). Sodium metasilicate (Na2SiO3): A thermo-kinetic analysis of its CO2 chemical sorption. Thermochimica Acta, 473(1-2), 92–95. https://doi.org/10.1016/j.tca.2008.04.022
Sodium metasilicate Preparation Products And Raw materials
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Shandong Zhongyuan Chemical Co., Ltd | 19812484234 19812484234 | 840301290@qq.com | China | 56 | 58 |
| Jinan Yuanmao Chemical Co., Ltd | 15665725027 18854103888 | 980803361@qq.com | China | 336 | 58 |
| Meryer (Shanghai) Chemical Technology Co., Ltd. | 4006356688 18621169109 | market03@meryer.com | China | 40202 | 62 |
| 3B Pharmachem (Wuhan) International Co.,Ltd. | 18930552037 | 3bsc@sina.com | China | 15813 | 69 |
| Alfa Aesar | 400-6106006 | saleschina@alfa-asia.com | China | 30103 | 84 |
| ShangHai DEMO Chemical Co.,Ltd | 400-021-7337 2355568890 | sales@demochem.com | China | 2569 | 57 |
| Energy Chemical | 400-0056266 | sales8178@energy-chemical.com | China | 44850 | 61 |
| Shandong Xiya Chemical Co., Ltd | 13355009207 13355009207 | 3007715519@qq.com | China | 18722 | 57 |
| Tianjin heowns Biochemical Technology Co., Ltd. | 400 638 7771 | sales@heowns.com | China | 14412 | 57 |
| Maya High Purity Chemicals | +86 (573) 82222445 (0)18006601000 452520369 | sales@maya-r.com | China | 11693 | 57 |
View Lastest Price from Sodium metasilicate manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-08-07 | Sodium metasilicate | $1.00 | 1KG | 99% | 20 tons | Shaanxi Dideu Medichem Co. Ltd | |
 |
2026-03-20 | Sodium metasilicate
6834-92-0
|
$10.00 | 1KG | 99% | 100 mt | Hebei Chuanghai Biotechnology Co., Ltd | |
 |
2025-06-20 | Sodium Metasilicate Anhydrous(SMA)
6834-92-0
|
$450.00 | 25T | 99.5% | 5000tons/month | Hebei Yanxi Chemical Co., Ltd. |
-
- Sodium metasilicate
- $1.00
- 99%
- Shaanxi Dideu Medichem Co. Ltd
-
- Sodium metasilicate
6834-92-0
- $10.00
- 99%
- Hebei Chuanghai Biotechnology Co., Ltd
-
- Sodium Metasilicate Anhydrous(SMA)
6834-92-0
- $450.00
- 99.5%
- Hebei Yanxi Chemical Co., Ltd.
