DISODIUM TRIOXOSILICATE
Disodium trioxosilicate is a highly alkaline inorganic silicate salt composed of sodium, silicon, and oxygen, most commonly encountered in hydrated forms, especially as the nonahydrate which appears as a white, odorless, crystalline solid.
In aqueous solution, Disodium trioxosilicate dissociates to release silicate and sodium ions, acting as a powerful buffering agent, dispersing agent, emulsifier, and corrosion inhibitor by forming protective passivation layers on metal surfaces.
Due to its strong alkalinity, excellent wetting, emulsifying, deflocculating, and soil-dispersing properties, Disodium trioxosilicate is widely used in detergents, industrial cleaners, metal cleaning, ceramics, cement, water treatment, textile processing, and paper manufacturing.
EC Number: 229-912-9
CAS Number: 6834-92-0
Molecular Formula: Na₂SiO₃·9H₂O
Molecular Mass: 284.20 g/mol
Synonyms: WATER GLASS, SILICA STANDARD, SODIUM-M-SILICATE, Sodium metasilicate, SODIUM METASILICATE, SODIUM SILICATE, META, disodium metasilicate, SODIUM SESQUISILICATE, DISODIUM TRIOXOSILICATE, Sodium Metasilicate Anhydrous, SODIUM METASILICATE N-HYDRATE, Disodium Metasilicate, Sodium Metasilicate, Disodium Salt, Sodium Silicate (Na₂SiO₃), Disodium Silicate, Metasilicic Acid, Disodium Salt, Sodium Trioxosilicate, Disodium, Silicic Acid, Disodium Salt, Water Glass (solid form, low modulus), Metasilicate of Sodium, Sodium Orthosilicate (commercial usage, incorrect but common), Alkaline Sodium Silicate, Inorganic Disodium Silicate, Na₂SiO₃, Disodium Silicate Anhydrous, Sodium Silicate Anhydrous
Disodium trioxosilicate is an inorganic alkaline salt composed of sodium, silicon, and oxygen.
Disodium trioxosilicate is commonly encountered in hydrated forms, especially as the nonahydrate.
Disodium trioxosilicate appears as a white, odorless, crystalline solid that is highly soluble in water and produces a strongly alkaline solution.
In aqueous media, Disodium trioxosilicate acts as a powerful buffering agent and corrosion inhibitor.
Chemically, Disodium trioxosilicate functions as a silicate builder with strong dispersing, emulsifying, and deflocculating properties.
These characteristics make Disodium trioxosilicate highly effective in breaking down fats, oils, proteins, and mineral deposits.
Due to its high alkalinity, Disodium trioxosilicate also provides excellent cleaning efficiency and enhances detergent performance.
Disodium trioxosilicate is widely used in industrial and laboratory applications, including detergents and cleaners, water treatment, textile processing, ceramic production, cement formulations, and as a stabilizing and anti-corrosion agent in metal cleaning operations.
In food and pharmaceutical industries, only strictly controlled grades may be used for equipment cleaning and processing systems.
Disodium trioxosilicate is registered under the REACH Regulation and is manufactured in and / or imported to the European Economic Area, at ≥ 10 000 to < 100 000 tonnes per annum.
Disodium trioxosilicate is used by consumers, in articles, by professional workers (widespread uses), in formulation or re-packing, at industrial sites and in manufacturing.
Disodium trioxosilicate is a salt of silicic acid, belonging to inorganic salt products is a non-toxic, tasteless, pollution-free white powder or crystalline particles, soluble in water, insoluble in alcohol and acid, aqueous solution is alkaline, easily hygroscopic deliquescence in the air, with descaling, emulsification, dispersion, wet, permeability and pH buffer capacity, by the state as "China's priority development of fine chemicals" and "future development of inorganic chemical products in China one of the priorities.
Disodium trioxosilicate is a low molecular weight Crystal prepared by the hydrothermal reaction of ordinary bubbling alkali and caustic soda.
There are anhydrous, pentahydrate and nonahydrate, among which nonahydrate exists only in China's market, Disodium trioxosilicate is an emergency product with low technical content that was developed in an urgent need of Disodium trioxosilicate in the Eighties of the last century.
Because its melting point is only 42 ℃, when Disodium trioxosilicate is 30~40 ℃, it will release crystal water, to the use of inconvenience, storage is easy to become liquid or paste, is gradually being eliminated, but due to some user habits and some areas of crystal water is not very concerned about, nine Disodium trioxosilicate still has a certain market.
In the inorganic electrolyte, Disodium trioxosilicate has the highest active alkalinity and PH buffer index, and has strong wetting, emulsification and saponification of oil, dispersion and suspension of dirt has excellent performance, and can prevent the re-deposition of dirt, Strong decontamination capacity, large buffer capacity, can neutralize acidic dirt, fat and oil emulsification, anti-flocculation effect on inorganic matter, anti-corrosion effect on metal, it can be used instead of sodium tripolyphosphate in the synthesis of efficient detergents and metal cleaning agents to reduce the pollution of sodium tripolyphosphate to the environment.
The application of Disodium trioxosilicate in detergents has a history of more than 40 years abroad, and the application technology is relatively mature.
There are also more than 20 years of domestic application to detergents and other industries, is a mature chemical products, but also has a mature and broad market.
Disodium trioxosilicate has a large number of applications in detergent, ceramic, electroplating, textile, printing and dyeing, paper making, cement, concrete, refractory materials, oil and leather processing and other industrial fields.
At present, the industry order of large amount of application is: ceramics, industrial cleaning, detergent, concrete, printing and dyeing, paper making, cement, oil mining, other.
Disodium trioxosilicate is a chemical compound with the formula Na₂SiO₃.
Disodium trioxosilicate is a white, crystalline solid that is highly soluble in water.
Disodium trioxosilicate is often referred to as sodium silicate or water glass.
Disodium trioxosilicate is a silicic acid salt, classified as an inorganic salt product.
Disodium trioxosilicate is non-toxic, harmless, and odorless, with purifying, emulsifying, moistening, dispersing, permeating, and PH buffering abilities.
As an aqueous solution, Disodium trioxosilicate is capable of hygroscopy and deliquescence when in contact with air.
Disodium trioxosilicate's forms include anhydrous, pentahydrate, and nonahydrate compounds.
Disodium trioxosilicate is estimated to be generally less aggressive and safer to use than caustic soda (sodium hydroxide).
Sodium silicate reacts with metal oxides to establish a protective film on metal surfaces, reducing the alkali’s tendency to corrode and dissolve metals.
This sort of protection is maintained as long as minute amounts of soluble silica remain in the presence of water.
In conjunction with surfactants, Disodium trioxosilicate aids the neutralization of acidic soil, the deflocculation of particulate soil, and the emulsification of oily and greasy soil.
Furthermore, Disodium trioxosilicate enhances the suspension of removed soil and prevents its reaccumulation.
The grease and dirt deposits get dispersed into small, suspended particles that rinse away without redepositing on freshly washed surfaces.
As a builder, Disodium trioxosilicate enhances/maintains the surfactant’s cleaning efficiency by balancing water hardness.
Also, Disodium trioxosilicate has the highest active alkalinity and PH buffering index among inorganic electrolytes, which enables its strong moistening, emulsifying, and saponifying effect on fats.
For this reason, Disodium trioxosilicate’s broadly used in manufacturing high-efficiency in soaps, detergents, and metal cleaners.
Disodium trioxosilicate pentahydrate can substitute STPP in detergent formulas to increase their cleaning efficiency while reducing environmental pollution.
Disodium trioxosilicate is also applicable in fireproofing mixtures, insecticides, fungicides, and antimicrobial compounds, as well as in dairy cleaning, paper deinking, and washing carbonated drink bottles.
Disodium trioxosilicate’s a chemical intermediate for silica gel catalysts, an active ingredient in adhesives, and a bleaching aid to stabilize hydrogen peroxide.
Furthermore, Disodium trioxosilicate’s utilized as a clay deflocculant in the ceramics industry and a boiler compound.
In combination with other salts such as sodium bicarbonate, Disodium trioxosilicate creates a paint stripper for aluminum.
Disodium trioxosilicate is a highly alkaline inorganic silicate salt composed of sodium, silicon, and oxygen.
Disodium trioxosilicate is most often encountered in hydrated forms, particularly as the nonahydrate, which appears as a white, odorless, crystalline solid with strong hygroscopic properties.
Disodium trioxosilicate is highly soluble in water and rapidly forms a clear, strongly alkaline solution, typically exhibiting a pH above 12 depending on concentration.
Disodium trioxosilicate's high alkalinity is the primary source of its chemical reactivity and industrial usefulness.
From a chemical standpoint, Disodium trioxosilicate functions as an effective source of soluble silica and alkali.
In aqueous environments, Disodium trioxosilicate dissociates to release silicate and sodium ions, enabling it to act as a buffering agent, dispersing agent, and corrosion inhibitor.
The silicate ions form protective passivation layers on metal surfaces, significantly reducing corrosion in alkaline systems.
This property makes Disodium trioxosilicate especially valuable in metal cleaning, boiler treatment, and water conditioning applications.
Disodium trioxosilicate exhibits strong emulsifying, deflocculating, and dispersing properties, allowing it to effectively break down grease, oils, fats, proteins, and particulate matter.
These characteristics make it one of the most important builder compounds in detergent and cleaning formulations.
Disodium trioxosilicate enhances surfactant efficiency by softening water through calcium and magnesium ion sequestration, preventing scale formation, and improving overall cleaning performance.
Disodium trioxosilicate's ability to stabilize suspensions also contributes to uniform dispersion of insoluble particles in liquid formulations.
In industrial applications, Disodium trioxosilicate is widely used in heavy-duty detergents, industrial cleaners, metal degreasing agents, textile processing chemicals, pulp and paper production, ceramic and cement manufacturing, and water treatment systems.
In ceramics, Disodium trioxosilicate functions as a deflocculant that improves the rheological properties of clay suspensions.
In the cement and concrete industry, Disodium trioxosilicate acts as a setting accelerator and strength-enhancing additive.
In water treatment, Disodium trioxosilicate is applied as a corrosion inhibitor and alkalinity regulator to protect pipelines and equipment.
Disodium trioxosilicate also plays an important role in surface treatment technologies.
Disodium trioxosilicate is used in surface preparation for coatings, in the production of silica gels, and as a binding agent in fire-resistant materials.
Due to its strong alkaline buffering capacity, Disodium trioxosilicate is frequently employed in formulations that require long-term pH stability under harsh chemical conditions.
Uses of Disodium Trioxosilicate:
Disodium trioxosilicate is widely used in various types of washing industry.
In the washing industry, such as super concentrated detergent, laundry detergent, laundry cream, dry cleaning agent, fiber bleach, fabric bleach, etc., also a large number of used for metal surface cleaning agent, beer bottle, aerosol detergent, after fully dissolved, Disodium trioxosilicate can be used as metal rust inhibitor, scale cleaning agent and electric device cleaning agent, and can be used as food industry detergent.
Disodium trioxosilicate can also be used as mud consistency regulator and mud coagulant in crude oil and natural drilling and excavation engineering; in the construction industry, it is used as a coagulant for preparing acid-resistant mortar, acid-resistant commercial concrete and cement.
In the paper industry, Disodium trioxosilicate can be used as an adhesive, an ink agent, and a paper surface treatment agent; in the textile industry as a printing and dyeing auxiliaries, fabric pre-treatment agent.
Disodium trioxosilicate can also be used as soap filler, detergent, egg preservative, and vegetation molecular sieve, silicic acid and fire materials.
Disodium trioxosilicate has lubricity, can be used for the production of ceramic body mud; With strong alkalinity, strong decontamination ability, large buffer capacity, can neutralize acidic dirt.
Emulsification of fat and oil, has anti-flocculation effect on inorganic substances, has anti-corrosion effect on metals, so Disodium trioxosilicate is one of the main components of super concentrated detergent powder, and is also used in dishwashing detergent, food industry detergent, metal detergent and waste paper deinking.
Consumer Uses:
The multiple hydrates of Disodium trioxosilicate are used in soap and bath/washing products.
They are also used as anti-corrosion agents in boiler-water feeds.
Disodium trioxosilicate is used in the following products: cosmetics and personal care products, washing & cleaning products, adhesives and sealants, air care products, biocides (e.g. disinfectants, pest control products), coating products, finger paints, non-metal-surface treatment products and polishes and waxes.
Other release to the environment of Disodium trioxosilicate is likely to occur from: indoor use (e.g. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners) and outdoor use.
Widespread uses by professional workers:
Disodium trioxosilicate is used in the following products: washing & cleaning products, pH regulators and water treatment products, laboratory chemicals, adhesives and sealants, coating products, finger paints, non-metal-surface treatment products, polishes and waxes, polymers and cosmetics and personal care products.
Disodium trioxosilicate is used in the following areas: building & construction work, formulation of mixtures and/or re-packaging, health services, printing and recorded media reproduction, municipal supply (e.g. electricity, steam, gas, water) and sewage treatment and mining.
Disodium trioxosilicate is used for the manufacture of: mineral products (e.g. plasters, cement), food products, pulp, paper and paper products, fabricated metal products, textile, leather or fur, metals and furniture.
Other release to the environment of Disodium trioxosilicate is likely to occur from: indoor use (e.g. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners), outdoor use, indoor use in close systems with minimal release (e.g. cooling liquids in refrigerators, oil-based electric heaters) and outdoor use in close systems with minimal release (e.g. hydraulic liquids in automotive suspension, lubricants in motor oil and break fluids).
Industry use:
Disodium trioxosilicate is commonly used as a base for dish and laundry detergent formulations and a bleaching aid.
Disodium trioxosilicate has a major utility as a builder of the cleaning efficiency of the surfactant in soaps and detergents.
Other applications include deinking paper, laundry, metal, and floor cleaning products.
Uses at industrial sites:
Disodium trioxosilicate is used in the following products: adhesives and sealants, pH regulators and water treatment products, textile treatment products and dyes, metal surface treatment products, washing & cleaning products, biocides (e.g. disinfectants, pest control products), coating products and non-metal-surface treatment products.
Disodium trioxosilicate is used in the following areas: formulation of mixtures and/or re-packaging, building & construction work and mining.
Disodium trioxosilicate is used for the manufacture of: mineral products (e.g. plasters, cement), textile, leather or fur and furniture.
Release to the environment of Disodium trioxosilicate can occur from industrial use: in the production of articles, formulation in materials, as processing aid, in processing aids at industrial sites and formulation of mixtures.
Other release to the environment of Disodium trioxosilicate is likely to occur from: indoor use (e.g. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners) and outdoor use.
Production of Disodium Trioxosilicate:
Sodium carbonate (or sodium hydroxide) was mixed with silica sand in a molar ratio of Na2O/SiO2 = 1:3, melted in a platinum crucible, and dissolved in water to form an aqueous solution of sodium silicate.
A calculated amount of sodium hydroxide was added to the solution so that the molar ratio of Na2O/SiO2 in the solution was 1:1.
The resulting solution of Na2O/SiO2 composition was heated to several tens of degrees, concentrated, and cooled to 30 ° C.
To obtain a nonahydrate, which was heated to obtain an anhydrous product.
Dry methods include soda ash method, sodium sulfate (mirabilite) method and trona method.
Soda ash method:
The soda ash and silica sand are mixed evenly according to a certain proportion, and the melting reaction is carried out at 1400~1500 ℃.
The melt is quenched and cooled by water to form glass frit, which is put into the dissolution tank while Disodium trioxosilicate is hot, then steam is introduced for heating, and water glass is prepared by sedimentation and concentration.
The reaction scheme is as follows.
Sodium sulfate method:
First sodium sulfate (Glauber's salt) and coal powder are mixed evenly, then Silica sand is added, after mixing evenly, Disodium trioxosilicate is quickly added to the furnace for reaction, after the reaction is completed, the product is cooled, crushed, dissolved, precipitation, concentration, preparation of water glass.
The reaction scheme is as follows.
Trona Method:
Mix Trona, silica sand and pulverized coal in a certain proportion, then add the adjustment role of caustic soda slag, the mixture is preheated by the top of the furnace for 2~4H and then put into the furnace for reaction, after 3~5h, a melt is generated, and the glass frit formed by cooling is dissolved, precipitated and concentrated to obtain water glass by quenching the discharge water.
The reaction scheme is as follows.
The liquid caustic soda and silica sand are mixed into the autoclave in proper proportion by wet method, and heated by direct steam.
After the pressure in the reactor rises to 0.7-0.8MPa, the direct steam is stopped, the pressure was maintained by a jacketed steam incubation, and the reaction was carried out for several hours.
The reaction mixture was filtered and concentrated to obtain a water glass. The reaction scheme is as follows.
The sodium hydroxide solution is added to the silica sand according to the theoretical amount, heated and stirred until dissolved, and the reaction is maintained for several hours: After the reaction is finished, filtration is performed.
After the filtrate was concentrated, the crystals were cooled to about 30 ° C., and the separated crystals were washed with ethanol and dried.
Add 13% ~ 14% sodium hydroxide solution to water glass containing 30.85% silica and 14.34% sodium oxide, stir and filter to make the filtrate completely transparent, and then add a small amount of sodium silicate nonhydrate seed crystal to the filtrate, stand still.
The crystals were filtered with suction, washed with ethanol and dried.
Synthesis of Disodium Trioxosilicate:
Disodium trioxosilicate is produced industrially by fusing a source of silica (usually high-purity quartz sand) with a sodium alkali (sodium carbonate or sodium hydroxide) at high temperature.
The fusion is carried out in rotary or reverberatory furnaces at temperatures typically between 1 100–1 400 °C until a homogeneous molten sodium silicate glass is obtained.
The melt is then cooled and solidified, crushed, and subsequently dissolved in water to form a concentrated sodium silicate liquor.
Main reactions:
Using sodium carbonate:
SiO₂ (s) + Na₂CO₃ (s) → Na₂SiO₃ (l) + CO₂ (g)
Using sodium hydroxide:
SiO₂ (s) + 2 NaOH (s) → Na₂SiO₃ (l) + 2 H₂O (g)
In both routes, the resulting melt is a sodium silicate of approximate metasilicate composition (Na₂SiO₃).
The exact molar ratio of Na₂O:SiO₂ is adjusted by controlling the charge composition (silica/soda ratio) and the fusion conditions.
Conversion to aqueous Disodium trioxosilicate solution:
The solidified sodium silicate glass is dissolved in demineralized water under controlled conditions (temperature, concentration, and pH) to produce a clear, alkaline Disodium trioxosilicate solution.
Insoluble residues are removed by filtration or settling.
At this stage, the solution composition is adjusted to the desired Na₂O:SiO₂ ratio and solids content by dilution or concentration (evaporation).
Crystallization of the nonahydrate (Na₂SiO₃·9H₂O)
To obtain Disodium trioxosilicate nonahydrate, the clarified sodium metasilicate solution is cooled under controlled conditions.
The temperature and concentration are chosen so that Na₂SiO₃·9H₂O is the thermodynamically stable hydrate phase.
Slow cooling and, if necessary, seeding with pure nonahydrate crystals promote uniform crystallization.
Na₂SiO₃ (aq) + 9 H₂O (l) → Na₂SiO₃·9H₂O (s)
The crystalline product is then separated by filtration or centrifugation, washed to remove mother liquor, and dried at moderate temperatures to prevent loss of water of crystallization.
The final material appears as white, free-flowing, crystalline granules.
Laboratory-scale preparation (conceptual):
On a laboratory scale, Disodium trioxosilicate can be prepared by reacting finely divided silica with stoichiometric sodium carbonate or sodium hydroxide in a high-temperature furnace to obtain anhydrous Na₂SiO₃, followed by dissolution in hot water.
The solution is filtered while hot, adjusted to the required concentration, and then slowly cooled to crystallize Na₂SiO₃·9H₂O.
The crystals are collected, briefly washed with cold water, and dried at a temperature low enough to preserve the nonahydrate.
Stability and Reactivity of Disodium Trioxosilicate:
Chemical Stability:
Disodium trioxosilicate is chemically stable under normal ambient temperatures and recommended storage conditions.
The hydrated form remains stable in sealed, dry containers and does not undergo hazardous decomposition during routine handling and storage.
Reactivity:
Disodium trioxosilicate is strongly alkaline and reacts exothermically with acids, releasing heat and forming corresponding sodium salts and silicic acid derivatives.
Disodium trioxosilicate may react with aluminum, zinc, tin, and other light metals, producing flammable hydrogen gas.
Disodium trioxosilicate also reacts with ammonium compounds and strong oxidizing agents.
Conditions to Avoid:
Avoid contact with strong acids, excessive moisture, uncontrolled heating, and contact with reactive metals.
Avoid generating dust and exposure to temperatures that may cause dehydration of the nonahydrate.
Incompatible Materials:
Strong acids, ammonium salts, aluminum, zinc, tin, fluorides, and strong oxidizing agents.
Hazardous Decomposition Products:
No hazardous decomposition products are expected under normal conditions of use.
At elevated temperatures or in contact with incompatible materials, decomposition may generate sodium oxide, silicon oxides, and corrosive alkaline vapors.
Handling and Storage of Disodium Trioxosilicate:
Safe Handling:
Handle in well-ventilated areas to prevent inhalation of alkaline dust.
Avoid skin and eye contact.
Use controlled transfer systems and avoid generating dust clouds.
Do not eat, drink, or smoke in handling areas.
Hygiene Measures:
Wash hands and exposed skin after handling.
Remove contaminated clothing before entering clean areas.
Maintain good personal hygiene practices.
Storage Requirements:
Store in tightly closed, moisture-resistant containers in a cool, dry, well-ventilated environment.
Protect from humidity, water, and direct contact with acids.
Packaging Integrity:
Keep containers sealed when not in use.
Avoid physical damage, compression, or stacking that may cause container rupture.
Shelf Stability:
The product remains chemically stable for extended periods when stored dry at room temperature.
Moisture exposure may cause caking but does not change chemical identity.
First Aid Measures of Disodium Trioxosilicate:
Inhalation:
Move the exposed person to fresh air immediately.
Keep at rest.
If coughing, breathing discomfort, or throat irritation persists, seek medical attention.
Skin Contact:
Immediately rinse skin with plenty of water.
Remove contaminated clothing.
Seek medical attention if irritation, burns, or pain develops.
Eye Contact:
Immediately flush eyes with clean water for at least 15 minutes while holding eyelids open.
Remove contact lenses if present.
Seek immediate medical attention.
Ingestion:
Rinse mouth with water.
Do not induce vomiting.
Give small amounts of water if conscious.
Seek immediate medical attention.
Notes for Physician:
Treatment is symptomatic and supportive.
No specific antidote exists.
Firefighting Measures of Disodium Trioxosilicate:
Flammability:
Disodium trioxosilicate is nonflammable and does not support combustion.
Suitable Extinguishing Media:
Use water spray, foam, dry chemical, or CO₂ according to surrounding fire conditions.
Hazardous Combustion Products:
At high temperatures, decomposition may release sodium oxide and silicon oxide fumes.
Special Protective Equipment for Firefighters:
Firefighters should wear full protective clothing and self-contained breathing apparatus.
Specific Hazards:
Although the product itself does not burn, containers exposed to extreme heat may rupture.
Avoid dispersing alkaline dust during fire suppression.
Accidental Release Measures of Disodium Trioxosilicate:
Personal Precautions:
Avoid inhalation of dust.
Ensure adequate ventilation.
Wear appropriate personal protective equipment.
Environmental Precautions:
Prevent uncontrolled discharge into drains, soil, or surface waters due to high alkalinity.
Cleanup Methods:
Avoid dry sweeping that generates dust.
Collect material using industrial vacuum equipment or damp methods.
Place into suitable labeled containers for disposal.
Additional Advice:
After cleanup, wash contaminated area with water, ensuring alkaline residues do not enter waterways untreated.
Exposure Controls and Personal Protective Equipment of Disodium Trioxosilicate:
Engineering Controls:
Use local exhaust ventilation and enclosed transfer systems to control airborne dust.
Respiratory Protection:
Use N95, P2, or equivalent particulate respirator when dust concentration exceeds exposure limits.
Hand Protection:
Chemical-resistant gloves such as nitrile, neoprene, or PVC.
Eye Protection:
Chemical safety goggles or full face shield.
Skin and Body Protection:
Alkali-resistant protective clothing.
Environmental Exposure Controls:
Prevent release of alkaline dust to the environment through filtration and containment systems.
Identifiers of Disodium Trioxosilicate:
Catalogue Number: TK.090110
Grade: Extra pure
Hill Formula: Na₂SiO₃·9H₂O
Chemical Formula: :
Molar Mass: 212.14 g/mol
HS Code: 2839.11.00
Assay: >= 95,0%
Sodium Oxide(Na2O): 28,0 - 30,0%
Silica(SiO2): 27,0 - 29,0%
Iron(Fe): <= 0,1%
Insoluble in Water: <= 0,2%
pH (1%,H2O, 20°C): 12,0-13,0
EC / List no.: 229-912-9
CAS no.: 6834-92-0
Mol. formula: Na₂SiO₃·9H₂O
CAS: 6834-92-0
EINECS: 215-687-4
InChI: InChI=1/2Na.HO3Si/c;;1-4(2)3/h;;4H/q2*+1;-2
InChIKey: NTHWMYGWWRZVTN-UHFFFAOYSA-N
Product form: Substance
EC List No: 014-010-00-8
EC No: 215-687-4
CAS No: 1344-09-8
Product code: 06000
Product type: Inorganic compound
Chemical formula: Na₂SiO₃·9H₂O
Properties of Disodium Trioxosilicate:
Appearance: White to colorless crystalline solid or granular powder.
Odor: Odorless.
Odor Threshold: Not applicable.
pH: Strongly alkaline. Typically pH 12–13 (1–5% aqueous solution at 20 °C).
Melting Point / Freezing Point: Decomposes before melting due to loss of water of crystallization. Dehydration starts above approximately 40–50 °C.
Boiling Point: Not applicable (decomposes).
Flash Point: Not applicable (nonflammable inorganic solid).
Evaporation Rate: Not applicable.
Flammability: Nonflammable, noncombustible.
Upper/Lower Flammability or Explosive Limits: Not applicable.
Vapor Pressure: Negligible.
Vapor Density: Not applicable.
Relative Density: Approximately 1.6–1.7 g/cm³ (bulk density varies with hydration and granulation).
Solubility: Highly soluble in water. Insoluble in most organic solvents.
Partition Coefficient (n-octanol/water): Not applicable (inorganic compound).
Auto-ignition Temperature: Not applicable.
Decomposition Temperature: Above approximately 40–100 °C depending on hydration state.
Viscosity: Not applicable for solid form. Aqueous solutions have low to moderate viscosity depending on concentration.
Molecular Weight: 284.20 g/mol
Chemical Formula: Na₂SiO₃·9H₂O.
Hydration State: Nonahydrate.
Alkalinity: Strongly alkaline.
Electrical Conductivity: High when dissolved in water due to complete ionic dissociation.
Surface Activity: Acts as a dispersing and deflocculating agent in aqueous systems.
Hygroscopicity: Moderately hygroscopic; absorbs moisture from air leading to caking.
Molecular Formula: Na2O3Si
Molar Mass: 122.06
Density: 2.4
Melting Point: 1089°C
Water Solubility: Soluble in cold water. Hydrolyzes in hot water. Insoluble in acids, alcohol and salt solutions.
Appearance: powder
Specific Gravity: 2.61
Color: White
Merck: 14,8642
PH: 11(1 mM solution);11.91(10 mM solution);12.62(100 mM solution)
Stability: hygroscopic
Sensitive: 0: forms stable aqueous solutions
Refractive Index: nD25 (glass) 1.520
Names of Disodium Trioxosilicate:
Regulatory process names:
Disodium metasilicate
disodium metasilicate
Disodium trioxosilicate
Silicic acid (H2SiO3), sodium salt (1:2)
Translated names:
Dinaatriummetasilikaat (et)
dinatrijev metasilikat (hr)
dinatrijev metasilikat (sl)
dinatrio metasilikatas (lt)
dinatriummetasilicaat (nl)
dinatriummetasilicat (da)
Dinatriummetasilikaatti (fi)
Dinatriummetasilikat (de)
dinatriummetasilikat (no)
dinátrium-metaszilikát (hu)
dinātrija metasilikāts (lv)
kremičitan disodný (sk)
metakrzemian disodu (pl)
metakřemičitan disodný (cs)
metasilicat disodic (ro)
metasilicato de disodio (es)
metasilicato di disodio disodio metasilicato (it)
metassilicato de dissódio (pt)
métasilicate de disodium (fr)
natriummetasilikat (sv)
μεταπυριτικό δινάτριο (el)
динатриев метасиликат (bg)
IUPAC names:
Disodium dioxido (oxo) silane
disodium dioxido(oxo)silane
disodium dioxido(oxo)silane pentahydrate
Disodium metasilicate
disodium metasilicate
Disodium Metasilicate
Disodium metasilicate
disodium metasilicate
Disodium metasilicate pentahydrate, Disodium trioxosilicate
disodium monosilicate
Disodium oxosilane diolate
disodium oxosilanebis(olate)
disodium oxosilanediolate
Disodium trioxosilicate
metakřemičitan disodný
Natriummetasilikat Pentahydrat
Silicic acid (H2SiO3), disodium salt
Sodium Metasilicate
Sodium metasilicate
sodium metasilicate
Sodium Metasilicate
Sodium metasilicate
sodium metasilicate anhydrous
Sodium metasilicate nonahydrate
Sodium metasilicate pentahydrate
sodium metasilicate pentahydrate
Sodium metasilicate; Waterglass; Sodium water glass ...
Trade names:
Metakrzemian sodowy
Metakrzemian sodowy pięciowodny
Metso
Simet
SODIUM METASILICATE
Sodium Metasilicate
Sodium metasilicate
Sodium Metasilicate Anhydrous
sodium metasilicate anhydrous
Sodium Metasilicate Pentahydrate
Sodium metasilicate,anhydorous
Sodium metasilicate,pentahydrate
Other identifiers:
014-010-00-8
1033016-09-9
1173151-60-4
13517-24-3
1374246-85-1
1884160-94-4
1919815-82-9
57447-81-1
6834-92-0
8014-92-4
