SODIUM METASILICATE 5H2O
sodium metasilicate pentahydrate
CAS: 10213-79-3
Molecular Formula: H10Na2O8Si
SODIUM METASILICATE 5H2O - Names and Identifiers
SODIUM METASILICATE 5H2O - Physico-chemical Properties
| Molecular Formula | H10Na2O8Si |
| Molar Mass | 212.14 |
| Density | 2.61 |
| Melting Point | 1088°C |
| Water Solubility | Soluble in cold water. |
| Appearance | Solid |
| Color | White |
| Merck | 14,8642 |
| Physical and Chemical Properties | Character white square crystal or spherical particles. melting point 72.2 ℃ relative density 0.7~1.0 solubility: soluble in water and dilute alkali, insoluble in alcohol and acid. The aqueous solution is alkaline. |
| Use | Used for super concentrated detergent, detergent, metal cleaning agent, food industry detergent, also used for paper bleaching, cotton yarn cooking, ceramic mud dispersion |
SODIUM METASILICATE 5H2O - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | R34 - Causes burns R37 - Irritating to the respiratory system |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
| UN IDs | UN 3253 8/PG 3 |
| WGK Germany | 1 |
| RTECS | VV9287500 |
| TSCA | Yes |
| HS Code | 28391100 |
| Hazard Class | 8 |
| Packing Group | III |
SODIUM METASILICATE 5H2O - Upstream Downstream Industry
| Raw Materials | Silicon dioxide Sodium silicate Sodium hydroxide |
SODIUM METASILICATE 5H2O - Nature
Open Data Verified Data
White Square crystal or spherical particles. The relative density of 0.7~1.0. Melting point 72.2 °c. Soluble in water and dilute alkali, insoluble in alcohol and acid. The aqueous solution is alkaline. It is easy to absorb moisture in the open air. With detergent, emulsification, dispersion, moisture, permeability and pH buffer capacity. The concentrated solution has corrosive effect on fabric and skin.
Last Update：2025-06-10 22:55:16
SODIUM METASILICATE 5H2O - Preparation Method
Open Data Verified Data
synthesis method: the water glass solid is dissolved at high temperature and high pressure, reacted with caustic soda, crystallized and separated, and the wet cake is dried to obtain a product. The separated mother liquor can be processed back to the synthesis process of the process.
Last Update：2022-01-01 11:03:43
SODIUM METASILICATE 5H2O - Application
Open Data Verified Data
It is mainly used as a high-efficiency additive in washing powder, metal detergent and dishwashing. For cotton yarn cooking. Also used for old paper to ink, printing decontamination, vegetable oil recovery. And can be used as a stabilizer for peroxide bleaching.
Last Update：2025-08-19 16:24:40
SODIUM METASILICATE 5H2O - Safety
Open Data Verified Data
The woven bag is lined with polyethylene plastic bag, and the seal should be tight. 25kg, 40kg or 50kg net weight per bag. It shall also be marked with "moisture-proof" and "rain-proof. Store in a cool, ventilated, dry place. Moisture-proof, rain-proof and sun-proof during transportation.
Last Update：2025-06-10 22:55:16
SODIUM METASILICATE 5H2O - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Overview | sodium metasilicate pentahydrate, commonly known as fast-dissolving water glass, belongs to the inorganic salt products, is, the Silicon fine chemical products developed by the United States, France's Rhone-Planck Company, the United States company, and the Swedish EKA company have a production capacity of tens of thousands of tons. Is a non-toxic, tasteless, pollution-free white powder or crystalline particles, soluble in water, insoluble in alcohol and acid, water absorption, alkaline aqueous solution, placed in the air, easy hygroscopic deliquescence, with detergent, emulsification, dispersion, wetting, permeability and pH buffer capacity, strong decontamination, pH buffer capacity, can neutralize acidic dirt, fat and oil emulsification, inorganic anti-flocculation effect, it also has anti-corrosion effect on metals. In the variety of sodium metasilicate, the most widely used and most typical is sodium metasilicate pentahydrate. The molecular formula of its crystal is usually written Na2SiO3 · 5H2O, which is actually tetrahydrate of dihydrogen sodium orthosilicate with two cations, solubility (20 °c) 50g/100g water, melting point 72 °c. Sodium metasilicate pentahydrate has the general characteristics of sodium silicate and sodium metasilicate, and has a certain binding ability of calcium and magnesium ions, especially the binding capacity of magnesium ions is greater than 260 mgco2/g(35 ℃, 20min). Because it can provide excellent buffer alkalinity in the washing liquid, it provides corrosion protection for light metals (aluminum, zinc, etc.), and has a protective effect on glassware and porcelain, and has the properties of suspension and emulsification of dirt and certain softening water, so it is widely used in household washing powder, laundry paste; Industrial detergent; Food cleaning agent; Metal cleaning agent; Fabric treatment and paper deinking, etc, it is an important auxiliary agent for concentrated detergent, non-phosphorus and low-phosphorus detergent. It is also used in the ceramic industry and the petroleum industry. |
| properties | White Square crystal or spherical particles, non-toxic and tasteless, soluble in water, open air, hygroscopic deliquescence. With detergent, emulsification, dispersion, moisture, permeability and pH buffer capacity. The concentrated solution has corrosive effect on fabric and skin. |
| synthesis route | Route 1: solution crystallization method is to prepare industrial water glass and industrial caustic soda to solid (SiO2 + Na2O) the mass fraction is 30% ~ 50%, the ratio of silicon to sodium is 0.3~1, the concentration is evaporated in a certain temperature range, the crystallization is cooled, then the solid-liquid separation and drying are carried out, and the crystalline sodium metasilicate pentahydrate product is obtained. Route 2: The granulation method is to prepare industrial water glass and industrial caustic soda to solid (SiO2 + Na2O) mass fraction of 50% ~ 60%, silicon sodium ratio is about 1, after refining, filtering, and then in a rotating equipment with pentahydrate sodium metasilicate powder return material crystallization, granulation, drying (medium is hot air, temperature is about 50 ℃), the resulting product is screened, the qualified product is packaged as a finished product, and the large particles are returned as a return by crushing and the fine particles. |
| Use | is widely used in washing products, and is an ideal substitute for phosphorus-containing sodium tripolyphosphate. Used for super concentrated detergent, detergent, metal cleaning agent, food industry detergent, also used for paper bleaching, cotton yarn cooking, ceramic mud dispersion, etc. In addition, the metal, glass, ceramic surface has anti-corrosion and gloss protection, rubber, plastic, wood, paper and other chemical, building materials products have moisture, waterproof and other effects. |
| health hazard | accidental ingestion caused acute gastroenteritis-like acute poisoning symptoms. Fatal. Skin contact can cause dermatitis or chapped. |
| first aid measures | Skin Contact: remove contaminated clothing and thoroughly rinse with plenty of running water. eye contact: immediately open the upper and lower eyelids and rinse with running water or normal saline. The patient visited hospital. inhalation: rapid departure from site to fresh air. Keep airway unobstructed. Oxygen was given at Dyspnea. When breathing stopped, artificial respiration was performed immediately. The patient visited hospital. ingestion: drink milk or egg white. The patient visited hospital. |
| toxicological data | hazard characteristics: exposure to high heat or exposure to acid or acid mist gives off highly toxic smoke. combustion (decomposition) products: hydrogen fluoride, silicon oxide, sodium oxide. fire extinguishing methods: water, sand, dry powder, carbon dioxide. |
| Protection Measure | engineering control: closed operation, partial ventilation. Respiratory Protection: workers should wear dust masks. When the concentration in the air is high, it is recommended to wear a gas mask. eye protection: wear chemical safety glasses. protective clothing: wear work clothes. hand protection: wear rubber gloves. Other: after work, shower and change clothes. Pay attention to personal hygiene. |
| Main reference material | [1] miaoyingju et al. Present Situation of preparation technology of sodium metasilicate pentahydrate. Inorganic salt industry, 2014, 46(12): 8-11. [2] Tang He. Part of the process equipment improvement of sodium metasilicate pentahydrate production method. Building materials development orientation (below).2016,6: 1672-1675. [3] Yuan shu ai. Study on the crystallization process of sodium metasilicate pentahydrate. Salt and chemical industry. 2008,2:29-31. [4] Sodium metasilicate pentahydrate. [5] Chen Xiaoqing et al. Study on the toxicity of sodium metasilicate pentahydrate. Everyone is healthy. 2017.22. |
| production method | 1. A synthetic method was used. The water glass solid is dissolved at high temperature and high pressure, reacted with caustic soda, crystallized and separated, and the wet cake is dried to obtain the product. The separated mother liquor can be processed back to the synthesis process of the process. The reaction scheme is as follows. |
Last Update：2024-04-10 22:29:15
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Raw Materials for SODIUM METASILICATE 5H2O