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Sodium Methyl Siliconate is widely used in many industries such as construction and chemical industry, its unique chemical structure and properties make it an ideal choice for solving waterproof and moisture-proof problems.
Sodium Methyl Siliconate is an organosilicon compound commonly used as a water-repellent and protective agent for mineral materials such as concrete, brick, and natural stone.
Sodium Methyl Siliconate usually appears as a clear or slightly yellow alkaline liquid that reacts with carbon dioxide in the air to create a durable, water-resistant coating on the surface.
CAS Number: 16589-43-8
Molecular Formula: CH3Na3O3Si
Molecular Weight: 160.09
EINECS Number: 240-648-3
Synonyms: methyl-silanetriosodiumsalt;Silanetriol,methyl-,sodiumsalt;Trisodium methylsilanetriolate;Monomethylsilanetriol, monosodium salt;Methylsilanetriol/sodium,(1:x) salt;722 Water repellent;DC 772;Dryseal C
Sodium Methyl Siliconate is a nonflammable, water-dilutable solution of sodium methyl siliconate (Sodium siliconate) developed to impart water repellency to a wide variety of natural stone and masonry surfaces.
The siliconate reacts with carbon dioxide in the air to form an insoluble repellent surface and reduce water absorption within 24 hours.
Sodium Methyl Siliconate, generally abbreviated as SHP, is a versatile chemical additive known for its remarkable water-repellent properties.
Sodium Methyl Siliconate is a fine, white powder composed of silicone polymer, a synthetic polymer known for its unique combination of flexibility, stability, and resistance to various environmental factors.
This Sodium Methyl Siliconate penetrating sealer is suitable for the surface of natural stone, like sandstone, limestone, and red brick, gray brick, granite, ceramics etc.; it is not suitable for polished or glazed surfaces.
Sodium Methyl Siliconate is a single-component curing synthetic polymer waterproof material with good permeability and crystallinity.
This coating prevents the penetration of moisture while still allowing the surface to breathe, which helps maintain the original appearance and prevents structural damage.
Chemically, Sodium Methyl Siliconate consists of sodium ions and methyl-substituted silicate anions that react when exposed to air or acidic environments.
During this reaction, it forms strong siloxane linkages that bond tightly to the surface, producing a hydrophobic layer that resists water infiltration.
Because of this reaction, treated materials gain long-lasting protection against weathering, efflorescence, and freeze-thaw damage.
In practical applications, Sodium Methyl Siliconate is widely used in construction and restoration projects to enhance the durability of porous surfaces.
It is applied through spraying, brushing, or dipping and penetrates deeply into the material, creating internal water resistance rather than forming just a surface film.
This property makes it ideal for exterior facades, bridges, monuments, and masonry walls exposed to rain and humidity.
When applied correctly, it significantly reduces water absorption without changing the texture or color of the treated substrate.
The compound allows water vapor to escape, which prevents trapped moisture from causing cracks, mold growth, or peeling in coatings.
This vapor permeability is one of its major advantages compared to conventional sealants or coatings.
Sodium Methyl Siliconate also provides protection against chemical degradation caused by acids, salts, and pollutants in the environment.
It minimizes the leaching of calcium from concrete, which helps maintain mechanical strength over time.
Additionally, it helps prevent the growth of moss and algae on damp surfaces by reducing water retention.
Improper application, however, can lead to surface whitening or residue due to excess sodium salts forming during the curing process.
To avoid this, it must be applied at the recommended concentration and allowed to react under dry conditions for full effectiveness.
Once cured, the resulting silicon-oxygen network is stable, non-toxic, and resistant to ultraviolet degradation.
Because of its excellent balance between performance and safety, Sodium Methyl Siliconate is widely used in eco-friendly building maintenance and infrastructure preservation.
It helps extend the service life of concrete and stone structures without altering their natural appearance.
Its effectiveness and durability make it one of the most reliable water-repellent treatments available for long-term protection in demanding environments.
Commercially available siliconates include potassium methyl siliconate (CAS 31795-24-1, CH5KO3Si) and sodium methyl siliconate (CAS 16589-43-8, CH5NaO3Si).
These are supplied as a concentrate in water with an active content of between 30 and 40% by weight.
This solution is further diluted in water prior to their application by spraying, dipping or rolling to a mineral building material, such as brickwork, to make the surface water repellent.
The dilution is clear, stable with a high pH of 13 to 14. When applied to a surface the siliconate reacts with carbon dioxide in the air to form an insoluble water resistant treatment within 24 hours.
CH5KO3Si + silanol functional substrate OHSi → CH4O3Si + KOH
The methyl group has now attached itself to the substrata.
2KOH + CO2 → K2CO3 + H2O
The salts formed by this reaction are often the cause of white efflorescence when too much of the solution is applied to the surface.
Methyl siliconates are used as water repellents due to their durability, good hydrophobicity and ease of application.
Manta WR-P02 is a technical improvement of sodium methyl silicate powder waterproofing agent, which has stronger penetration crystallization, waterproof and moisture-proof ability, and can also improve the strength of the substrate.
The silanol groups in its molecular structure react with the silanol groups in the silicate material to cross-link when they come into contact with water, thereby achieving "reverse capillary, forming an excellent hydrophobic layer, and at the same time having the function of micro-expansion and increasing density.
Sodium Methyl Siliconates are highly alkaline aqueous solution and impart water repellency on porous surfaces, such as sandstone, limestone, brick, roofing tiles, floor tiles, granite, pottery clay and etc.
They are not suitable for polished or glazed surfaces.
Sodium Methyl Siliconate, a reliable silicone supplier, penetrate into the porous surface and react with atmospheric carbon dioxide to form a water-repellent surface barrier and white colored precipitate after the water has evaporated.
The white layer is water-insoluble and visible according to the dosage, removal processes should be taken to keep the appearance of surface satisfactory.
Sodium Methyl Siliconate penetrating sealers for concrete are good clear silicone waterproof sealant options with an excellent water bead effect the formulations based on siliconates are simple handling, solvents free, order free and low-cost.
However they are strong alkaline and easily being washed out by rain before cured. 24 hours or longer dry time is best.
Density : 1.24
Solubility : DMSO (Slightly), Methanol (Slightly), Water (Sparingly, Sonicated)
Form : Oil
Color : Colourless
Specific Gravity : 1.24
Hydrolytic Sensitivity : 0 – forms stable aqueous solutions
InChI : InChI=1S/CH3O3Si.3Na/c1-5(2,3)4;;;/h1H3;;;/q-3;3*+1
InChIKey : TYWKEXJQDDWAAM-UHFFFAOYSA-N
SMILES : [Si]([O-])([O-])([O-])C.[Na+].[Na+].[Na+]
Sodium Methyl Siliconate is an aqueous solution of sodium methyl siliconate for the impregnation of mineral construction materials in diluted form to make them waterproof.
Sodium Methyl Siliconate reacts with the atmospheric CO2 to form an active water-resistant which firmly combine with the surface of the masonry within 24 hours.
As with all siliconates, however, Sodium Methyl Siliconate can cause a white deposit on the surface of colored construction materials.
Sodium Methyl Siliconate is a Reaction prod. of aq. sodium hydroxide and resinous silicone Sodium methyl siliconate uses and applications include: Water repellent and cleaner for limestone, concrete, and masonry; material additive or surfactant treatment for coatings; in paperpaperboard in contact with dry food.
Sodium Methyl Siliconate is an inorganic-organic hybrid compound that combines the stability of a silicate structure with the water-repelling properties of methyl groups.
It is classified as a siliconate salt, where the methyl-substituted silicon atoms are bonded to oxygen atoms and stabilized by sodium ions.
This structure allows it to react efficiently with mineral surfaces, creating a strong chemical bond that enhances both protection and durability.
When applied to a porous surface, Sodium Methyl Siliconate penetrates deeply into the material’s capillaries and micro-cracks.
Upon contact with atmospheric carbon dioxide, it undergoes a neutralization reaction that produces a siloxane film and releases sodium carbonate as a by-product.
This newly formed siloxane layer binds tightly to the mineral substrate, creating a long-lasting hydrophobic barrier that resists water infiltration.
Unlike surface sealants, Sodium Methyl Siliconate does not form a thick film or glossy coating.
Instead, it chemically modifies the inner surface of the pores, preserving the natural texture and color of the treated material.
Because of this, it is ideal for applications where visual appearance and vapor permeability are critical, such as historical restoration and architectural preservation.
In construction, it is widely used to protect building facades, bridges, tunnels, and pavements from moisture-induced damage.
Its treatment helps prevent efflorescence, corrosion of steel reinforcements, and surface cracking caused by freeze–thaw cycles.
Sodium Methyl Siliconate is especially beneficial in humid or coastal regions, where structures are continuously exposed to high levels of moisture and salts.
Sodium Methyl Siliconate is also used in the production of waterproof coatings, cement additives, and anti-stain treatments.
It improves the resistance of concrete and stone to acidic rain, de-icing salts, and chemical pollution.
Additionally, it enhances the bonding of paints and coatings by creating a stable, moisture-resistant base layer.
In the manufacturing industry, it can serve as a component in water-based silicone emulsions, where it provides excellent dispersibility and reactivity.
Its alkaline nature allows it to function as a catalyst in certain condensation reactions involving silanol groups.
This property is particularly useful in formulating water-repellent emulsions for industrial and architectural coatings.
From an environmental standpoint, Sodium Methyl Siliconate is considered an eco-friendly alternative to solvent-based repellents.
It contains no volatile organic compounds (VOCs) and produces minimal odor during application.
Once cured, it becomes chemically inert and non-leaching, making it safe for use in residential, commercial, and outdoor settings.
Uses Of Sodium Methyl Siliconate:
Sodium Methyl Siliconate acts as a reagent in molecular modeling for screening environmental chemicals for estrogenicity use of the toxicant-target approach.
Sodium Methyl Siliconate for silane coating concrete is supplied concentration of 30 percent in water; SiSiB WR0772 is usually diluted to a concentration of 3 percent or less before application.
To prepare a 3 percent solution, mix one liter Sodium Methyl Siliconate as supplied, with 11 liters of water.
Sodium Methyl Siliconate is primarily used as a water-repellent treatment for porous building materials such as concrete, brick, plaster, and natural stone.
It penetrates deeply into the surface and reacts with atmospheric carbon dioxide to form an insoluble siloxane layer that prevents water absorption.
This makes it an excellent choice for protecting structures from rain, moisture, and freeze–thaw damage while preserving the natural look of the substrate.
In the construction industry, it is widely applied to exterior facades, bridges, tunnels, and architectural monuments.
It provides long-lasting hydrophobic protection that prevents efflorescence and the formation of white salt deposits on surfaces.
This helps maintain both the aesthetic and structural integrity of the building materials under varying weather conditions.
Sodium Methyl Siliconate is also used to extend the service life of concrete structures exposed to aggressive environments.
It protects reinforced concrete by limiting chloride and water penetration, reducing the risk of steel corrosion inside the structure.
Its deep-sealing properties make it particularly useful for highways, parking decks, sea walls, and other infrastructure exposed to moisture and salts.
In addition to protection, it is used as a key ingredient in surface treatment formulations such as water-based silicone coatings and emulsions.
These formulations enhance weather resistance and create self-cleaning or anti-stain surfaces that repel both water and dirt.
Such coatings are often used on roofs, pavements, ceramic tiles, and fiber cement boards for long-term waterproofing performance.
Sodium Methyl Siliconate is also applied in historical preservation projects where surface modification must not alter color or texture.
Because it forms a transparent hydrophobic layer without blocking vapor diffusion, it allows ancient stone and masonry structures to “breathe.”
This property makes it highly suitable for heritage buildings, sculptures, and monuments requiring gentle but effective conservation treatments.
In the manufacturing field, it serves as an additive in cementitious and plaster-based materials to improve workability and moisture resistance.
By incorporating it into dry-mix mortar or stucco formulations, it enhances surface durability and prevents water-induced deterioration.
This helps reduce maintenance needs and prolongs the lifespan of exterior coatings and cement-based composites.
Sodium Methyl Siliconate is also used in anti-graffiti coatings and paint systems due to its non-stick and water-repellent behavior.
It forms a smooth, hydrophobic surface that minimizes the adhesion of paint, dust, and pollutants.
This makes cleaning easier and helps maintain the visual appearance of buildings in urban areas.
In the paper and textile industries, the compound is sometimes employed as a surface treatment to impart water resistance.
It creates a thin hydrophobic film that prevents water absorption without affecting flexibility or breathability.
This treatment can be used for specialized packaging papers, outdoor fabrics, or filtration materials.
It is also used in the production of cleaning and polishing agents for stone, tile, and ceramic surfaces.
The compound helps form protective films that prevent water spots, mineral deposits, and soiling.
This gives treated surfaces a longer-lasting, clean appearance with reduced maintenance requirements.
Sodium Methyl Siliconate has applications in industrial coatings and adhesives as a coupling agent that improves adhesion to mineral substrates.
It enhances the compatibility between inorganic surfaces and organic resins by creating a stable silicon-oxygen interface.
This chemical bridge increases the strength and longevity of bonded or coated materials exposed to humidity or temperature changes.
In agriculture, it is occasionally used as a formulation component in water-repellent coatings for fertilizers or soil-conditioning agents.
This prevents the premature dissolution of granules and allows controlled release of nutrients.
It also reduces soil erosion and water runoff by promoting even distribution of hydrophobic particles.
Overall, Sodium Methyl Siliconate serves as a versatile and eco-friendly material for waterproofing, surface protection, and chemical stabilization.
Its ability to penetrate deeply, react chemically, and form permanent hydrophobic layers makes it indispensable in construction, restoration, and industrial applications.
Through its multifunctional use, it contributes to the longevity, safety, and appearance of structures and materials across numerous sectors.
Application should be avoided on extremely windy days to avoid rapid evaporation of the water carrier.
After application of the silicone fluid, the treated surface should be allowed to dry at least 24 hours to develop maximum water repellency.
The emulsion oligo methyl hydride siloxane has properties and characteristics similar with the methyl hydride siloxane. The emulsion is also used to provide various materials with water repellency properties.
However, as oligo methyl hydride siloxane is the water emulsion, it can be applied as an additive in the production of solutions and mixtures that is by the volumetric method.
For concrete, asbestos, gypsum, ceramic, porcelain, in the production of waterproof papers and leather; in the production of water-resistant fabrics; by volumetric method in the manufacture of paving tiles, slabs, curbs, fences of different silicate materials; as plasticizer in the preparation of plaster, lime and cement solutions; as an air involving admixture in the preparation of cement solution
Liquid is a mixture of tetra ethoxy silane and polyethoxy siloxanes.
Metal manufacture: binding agent in the manufacture of ceramic molds for precision core-mold casting; manufacture of rods exposed to high temperatures; manufacture of non-stick paints; Textile industry: feltproofing of woolen cloths; abatement of carpet shrinkage; antirot and antidust protection of carpets; impregnating compound for filter cloths; Construction engineering: hydrophobization of construction materials, treatment of coated surfaces; porosity decreasing impregnation of concrete; manufacture of acid-resistant cement; Glasswork and cerarnics: antireflection treatment of optical glass; application of light-diffusing coat to electric light bulbs; binding agent for ceramic mixtures, resistant to strongly corrosive mediums, with high manufacture of fireproof material standing temperatures of about 1750 °C and stress of above 127 kg/cm3;
Coating industry: paint additives forming quick-drying, thermostable and water-resistant coats with constant gloss.
Safety Profile Sodium Methyl Siliconate:
Sodium Methyl Siliconate is considered a hazardous alkaline substance that must be handled with care during storage and application.
It is strongly basic and can cause irritation or burns to the skin and eyes upon direct contact.
Because of its corrosive nature, safety precautions such as wearing gloves, goggles, and protective clothing are necessary during handling.
When the compound comes into contact with skin, it may cause redness, dryness, and mild to severe irritation depending on the exposure time.
Prolonged or repeated exposure can lead to chemical burns or dermatitis if the solution is concentrated.
Any contact should be immediately washed with plenty of clean water to prevent tissue damage or discomfort.
Eye exposure to Sodium Methyl Siliconate can result in intense irritation, redness, and potential corneal injury.
Even small splashes can cause pain and inflammation because of the high alkalinity of the compound.
Protective eyewear such as sealed goggles or face shields should always be used when spraying or mixing the material.
Inhalation of the mist or vapor during application can irritate the respiratory system and mucous membranes.
Exposure may lead to coughing, throat dryness, or a burning sensation in the nasal passages if ventilation is poor.
Workers should apply the product in well-ventilated areas and wear respiratory protection when aerosol formation is likely.
Accidental ingestion of Sodium Methyl Siliconate is harmful due to its caustic and corrosive nature.
It can cause burning of the mouth, throat, and gastrointestinal tract, leading to pain, nausea, or vomiting.
In case of ingestion, medical attention should be sought immediately, and the individual should not be induced to vomit.
