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Sodium metasilicate

Overview Identifying tests Content Analysis Toxicity
Sodium metasilicate
Sodium metasilicate
Chemical Name:
Sodium metasilicate
B-W;Metso;simeta;Na2SiO3;Lasilso;metso20;Orthosil;Metso 20;Crystamet;Drymet 59
Molecular Formula:
Formula Weight:
MOL File:

Sodium metasilicate Properties

Melting point:
refractive index 
nD25 (glass) 1.520
Specific Gravity
Water Solubility 
Soluble in cold water. Hydrolyzes in hot water. Insoluble in acids, alcohol and salt solutions.
CAS DataBase Reference
6834-92-0(CAS DataBase Reference)
NIST Chemistry Reference
Sodium silicate(6834-92-0)
EPA Substance Registry System
Silicic acid (H2SiO3), disodium salt(6834-92-0)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  C
Risk Statements  36/37/38-37-34
Safety Statements  26-45-36/37/39-13-24/25
RIDADR  UN 3253 8/PG 3
WGK Germany  1
RTECS  VV9275000
HazardClass  8
PackingGroup  III
HS Code  28391910
Hazardous Substances Data 6834-92-0(Hazardous Substances Data)
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H290 May be corrosive to metals Corrosive to Metals Category 1 Warning P234, P390, P404
H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501
H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501
H318 Causes serious eye damage Serious eye damage/eye irritation Category 1 Danger P280, P305+P351+P338, P310
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P310 Immediately call a POISON CENTER or doctor/physician.
P301+P330+P331 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405 Store locked up.

Sodium metasilicate price More Price(8)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 307815 Sodium metasilicate 6834-92-0 25g $37.1 2018-11-13 Buy
Sigma-Aldrich 307815 Sodium metasilicate 6834-92-0 1kg $50 2018-11-13 Buy
Alfa Aesar 014106 Sodium metasilicate, anhydrous, tech. 6834-92-0 *5x1kg $134 2018-11-16 Buy
Alfa Aesar 014106 Sodium metasilicate, anhydrous, tech. 6834-92-0 1kg $35.9 2018-11-16 Buy
Strem Chemicals 93-1196 Sodium metasilicate, anhydrous, min. 95% 6834-92-0 500g $38 2018-11-13 Buy

Sodium metasilicate Chemical Properties,Uses,Production


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.


Corrosive; do not contact with eyes, skin or clothes, and do not inhale its vapor.

Chemical Properties

White, granular powder. Soluble in water; p H of 1% solution 12.7. Noncombustible.


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.


A crystalline silicate.


Toxic by ingestion, protective clothing required.

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.

Purification Methods

Crystallise it from aqueous 5% NaOH solution. [Schwartz Z Anorg Allgem Chem 126 62 1923.]

Sodium metasilicate Preparation Products And Raw materials

Raw materials

Preparation Products

Sodium metasilicate Suppliers

Global( 153)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32651 55
Hefei TNJ Chemical Industry Co.,Ltd.
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86-0551-65418684 China 1659 55
Haihang Industry Co.,Ltd
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Chemwill Asia Co.,Ltd.
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J & K SCIENTIFIC LTD. 400-666-7788 +86-10-82848833
+86-10-82849933; China 96815 76
Meryer (Shanghai) Chemical Technology Co., Ltd. +86-(0)21-61259100(Shanghai) +86-(0)755-86170099(ShenZhen) +86-(0)10-62670440(Beijing)
+86-(0)21-61259102(Shanghai) +86-(0)755-86170066(ShenZhen) +86-(0)10-88580358(Beijing) China 40395 62
3B Pharmachem (Wuhan) International Co.,Ltd. 86-21-50328103 * 801、802、803、804 Mobile:18930552037
86-21-50328109 China 15926 69
Alfa Aesar 400-610-6006; 021-67582000
021-67582001/03/05 China 30291 84
ShangHai DEMO Chemical Co.,Ltd 400-021-7337 qq:2355568890
0086-21-50182339; China 2607 57
Energy Chemical 021-58432009 / 400-005-6266
021-58436166-800 China 44187 61

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