Molecular Formula | Na2O3Si |
Molar Mass | 122.06 |
Density | 2.33g/mLat 25°C(lit.) |
Melting Point | 1410°C(lit.) |
Boling Point | 2355°C(lit.) |
Water Solubility | very slightly soluble cold H2O [MER06] |
Solubility | H2O: soluble |
Appearance | powder |
Color | Colorless |
Merck | 13,8751 |
Storage Condition | -20°C |
Stability | Stable. Incompatible with acids, most metals, many organic materials. |
Physical and Chemical Properties | Colorless, pale yellow or blue-gray transparent viscous liquid. soluble in water, alkaline. |
Use | Mainly used as a binder, detergent, soap filler, soil stabilizer, textile industry dyeing agent, bleaching agent and sizing agent, mineral flotation agent |
Risk Codes | R11 - Highly Flammable R36/38 - Irritating to eyes and skin. R34 - Causes burns R23/24/25 - Toxic by inhalation, in contact with skin and if swallowed. R36/37/38 - Irritating to eyes, respiratory system and skin. R35 - Causes severe burns R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. 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 - Wear suitable protective clothing and gloves. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S7/9 - S28 - After contact with skin, wash immediately with plenty of soap-suds. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S36 - Wear suitable protective clothing. S27 - Take off immediately all contaminated clothing. |
UN IDs | UN 2922 8/PG 2 |
WGK Germany | 2 |
RTECS | VW0400000 |
FLUKA BRAND F CODES | 34 |
HS Code | 28391910 |
Hazard Class | 8 |
Packing Group | II |
Toxicity | LD50 oral in rat: 1960mg/kg |
Industrial sodium silicate has different properties due to the different ratio of sodium oxide to silica in the molecule. The molecular molar ratio of sodium oxide to silica is referred to as a modulus, and those with a modulus of 3 or more are referred to as neutral water glass, and those with a modulus of 3 or less are referred to as alkaline water glass. Its products are usually divided into solid water glass, hydrated water glass and liquid water glass. Sodium silicate is a colorless, pale yellow or cyan transparent viscous liquid. Soluble in water is alkaline. In case of acid decomposition and precipitation of colloidal precipitation of silicic acid, belonging to the vitreous body material, no fixed melting point, water treatment with a general modulus of 2. 5~3.0.
dry method: the soda ash and silicon are uniformly mixed in a certain proportion and melted. It was dissolved by heating, settled and concentrated. Or sodium sulfate (Glauber's salt), pulverized coal mixed with silica sand reaction. It can also be prepared by mixing Trona, silica sand and pulverized coal in proportion and melting reaction. Wet Method is the liquid caustic soda, silica sand in the reaction kettle heating reaction, the product is filtered and concentrated.
as a corrosion inhibitor, silicate was first used in the prevention of domestic water pipeline. After that, the composite formula with silicate as the main corrosion inhibitor was prepared by domestic and foreign researchers, which further improved the corrosion inhibition performance of silicate. Silicate can be on the clean metal surface, can also have rust on the metal surface to form a protective film, but these protective films are porous, so the use of silicate alone is poor corrosion inhibition, silicate often with polyphosphate, organic phosphate, molybdate, zinc salt and other corrosion inhibitors compound, synergistic effect. At present, the development and research of silicon composite agent has become a new development trend. Silicate can not only inhibit the corrosion of steel in cooling water, but also can inhibit the corrosion of non-ferrous metal-aluminum and copper and its alloys, lead, zinc coating, especially suitable for the control of brass. Silicates are effective in preventing CI-attack and can therefore be used in water make-up water or circulating water systems containing high Cl. There are circulating cooling water, the general use of silicate concentration of 40~60mg/L (Sioz), and low 25mg/L. The running pH value of Shengjia was 8.O -9.5. When silicate is used as a corrosion inhibitor, sufficient oxygen must be present in the cooling water for the metal to be effectively protected.
Sodium silicate is low in drugs and has a stimulating effect on the skin and mucous membranes. If fed into the body, can cause Vomit and Diarrhea. Protection should be provided when contacting and using sodium silicate. Containers should be sealed and stored in a well-ventilated warehouse. It is not allowed to be stored and mixed with acid articles.