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Industrial Potassium Silicate Products | Manufacturer & Supplier
Potassium silicate, widely known as potassium water glass in the industrial chemical sector, is an essential inorganic chemical compound formed by the fusion of potassium oxide (K₂O) and silicon dioxide (SiO₂).
Potassium silicate is a high-performance alkaline silicate widely used in coatings, welding electrodes, agriculture, concrete hardeners, refractory materials and specialty chemical applications.
Sanlee Chemical is a professional potassium silicate manufacturer and potassium silicate supplier, producing standardized potassium silicate products worldwide with adjustable modulus ratios to meet diverse industrial application requirements.
What is Potassium Silicate
Chemical Formula
What is potassium silicate? Potassium silicate, commonly known as potassium water glass raw material, is an inorganic substance, and its aqueous solution is commonly known as potassium water glass. Its chemical formula is K₂O⋅nSiO₂.
As a widely used industrial raw material, industrial potassium silicate possesses unique physical and chemical properties, such as excellent adhesion, high-temperature resistance, alkaline stability, and corrosion resistance, making it a fundamental material for industries including agriculture, welding electrode production, coatings manufacturing, and fireproof materials.
Modulus N
In the chemical formula K₂O·nSiO₂, n represents the ratio of the moles of silicon dioxide to those of alkali metal oxides, and is called the modulus of potassium silicate.
This is a key indicator for differentiating various grades of potassium water glass. This modulus directly determines the viscosity, solubility, curing speed and chemical stability of potassium silicate products.
Physical Forms
Potassium silicate exists in various physical forms, mainly including solid potassium silicate, liquid potassium silicate, and highly efficient instant soluble potassium silicate or called potassium silicate powder.
Solid potassium silicate appears as a pale off-white blocky solid, looking like a frosted glass block.
The appearance of liquid potassium silicate varies depending on the content of impurities. When there are more impurities, it appears as a gray or light yellow transparent liquid. However, the higher-quality liquid potassium silicate has a clear and transparent appearance, similar to water.
Powdered potassium silicate presents as a white powder and is extremely soluble in water. After dissolving in water, it shows different aqueous solution appearances based on the content of impurities.
Each form has been customized for specific industrial scenarios. As an economical and environmentally friendly industrial chemical, industrial potassium silicate has replaced many traditional chemical additives and has become an indispensable raw material in modern industrial production.
Types of potassium silicate
Sanlee Chemical is a reputable producer of potassium silicate. It strictly classifies its products according to industry standards and provides customized potassium silicate solutions for different industrial needs.
Potassium silicate is mainly divided into the following three mainstream types: solid potassium silicate, liquid potassium silicate and instant soluble potassium silicate powder.
Each type of industrial potassium silicate has its own unique performance advantages and targeted application scenarios.
The following details the characteristics, specifications, and application fields of various core potassium silicate products.
Solid Potassium Silicate
Solid potassium silicate is the crystalline form of potassium water glass.
It is produced by melting, cooling and solidifying the potassium silicate raw material at high temperatures. It usually appears as colorless or pale off-white transparent blocks, sheets or granular solids, with high hardness and stable chemical properties at room temperature.
Compared with liquid potassium silicate, solid potassium silicate has a longer storage period, lower transportation cost, and is less likely to leak or deteriorate during long-distance transportation.
Therefore, it is suitable for long-term storage and large-scale transportation across regions.
Before use, the solid industrial-grade potassium silicate needs to be dissolved in hot water to prepare liquid potassium water glass with the desired concentration and modulus.
Sanlee Chemical can produce solid potassium silicate products with customized particle size and modulus specifications according to customer requirements. The modulus of solid potassium silicate usually remains stable within the range of 2.0 to 3.9, and it has a high silicon content, excellent bonding strength and high-temperature resistance.
Solid potassium silicate has strong hygroscopicity. During storage, it should be placed in a dry and well-ventilated environment to avoid deliquescence due to moisture absorption, as this phenomenon will affect the dissolution effect and performance.
By following the standardized packaging and storage guidelines provided by reputable potassium silicate supplier enterprises, customers can effectively ensure the stable performance of solid potassium water glass.
Solid Potassium Silicate Modulus 3.9-4.0
Premium potassium silicate lumps, solid potassium silicate modulus 3.9-4.0 supplied by top solid potassium silicate supplier Sanlee Chemical, featuring superior water resistance and binding performance. Widely applied in welding rod production, inorganic protective coatings, refractory binders and fireproof chemicals. Custom grades supported by experienced chemical manufacturer & worldwide exporter.
Solid Potassium Silicate Modulus 3.1-3.3
High-quality solid potassium silicate with modulus 3.1-3.3. Suitable for welding electrodes, refractory materials, silicate coatings, concrete densifiers and broad industrial manufacturing. As a professional solid potassium silicate manufacturer, Sanlee Chemical provides custom grades & specifications with reliable factory supply and export service.
Solid Potassium Silicate Glass (Potassium Water Glass) – Sanlee Chemical
Its appearance is mostly colorless or slightly yellowish transparent glass-like particles or blocks, with a hard texture and being difficult to break.
Powdered Potassium Silicate
Powder potassium silicate, also called instant soluble potassium silicate or fast-dissolving potassium water glass, is a new high-efficiency modified industrial potassium silicate product developed in recent years. Powder potassium silicate is a white or light gray powder with good fluidity and strong moisture absorption (moisture prevention is strictly required). It dissolves rapidly in cold or warm water within seconds to minutes without heating, forming a transparent or slightly turbid alkaline solution with a pH value of 12–13 in aqueous state.
It is manufactured via special granulation technology based on traditional solid potassium silicate, solving the slow dissolution defect of ordinary solid potassium silicate. Powder potassium silicate can dissolve fully and rapidly in normal-temperature water without high-temperature heating, greatly boosting production efficiency.
This grade of industrial potassium silicate features uniform particle size, excellent flowability and no agglomeration, alongside ultra-fast dissolving speed. It can form a homogeneous and stable potassium silicate aqueous solution in a short time, delivering consistent performance equivalent to conventional liquid potassium water glass. Instant potassium silicate is widely adopted by small and medium industrial manufacturers, on-site construction works, and all scenarios requiring rapid preparation of silicate solutions.
As a high value-added product offered by modern potassium silicate manufacturers, instant potassium silicate has gradually captured partial market share of ordinary solid potassium silicate thanks to its easy operation and high efficiency.
Potassium Silicate Powder Modulus 3.1-3.3
High-purity instant potassium silicate powder with customizable modulus 2.3–3.4 dissolves rapidly in cold water without heating. Boasting stable alkalinity, low impurity content and excellent formulation compatibility, this powder outperforms sodium silicate in bonding strength and water resistance, widely used for refractory binders, anti-corrosion coatings, agricultural silicon fertilizer, welding flux, concrete hardeners and specialty fine chemicals.
Potassium Silicate Powder Modulus 2.7-2.9
High-purity modulus 2.7-2.9 powdered potassium silicate with fast cold-water solubility, stable alkalinity and low impurities. This instant dissolving silicate powder boasts excellent additive compatibility and better thermal stability than sodium silicate, widely applied in detergents, refractories, construction hardeners, welding materials, agricultural fertilizers and industrial coatings.
Potassium Silicate Powder Modulus 2.4-2.5
Modulus 2.3-2.5 Potassium Silicate Powder is high-purity instant-dissolving potassium silicate powder with optimized SiO₂-K₂O ratio. It dissolves rapidly in cold water, maintains steady alkalinity, contains minimal impurities and mixes well with various inorganic additives & surfactants. Widely applied in agricultural silicate fertilizer, welding rods, refractory adhesives, fireproof coatings and specialty fine chemicals.
Liquid Potassium Silicate
Liquid potassium silicate, commonly known as potassium water glass raw material, is an inorganic substance, and its aqueous solution is commonly known as potassium water glass. It is one of the most widely used inorganic silicate solutions in industry. Its name derives from the glassy solid formed after cooling, which features excellent adhesion, high temperature resistance, and chemical stability, and is widely applied in fields such as agriculture, coating processing, welding electrode manufacturing, and fireproof materials.
Liquid potassium silicate is a colorless, light yellow transparent viscous liquid. It is easily soluble in water and soluble in dilute potassium hydroxide solution. It is regarded as a green and environmentally friendly industrial binder that conforms to sustainable development concepts.
As a classic inorganic silicate solution, liquid potassium silicate continues to play a vital role in agriculture, fireproof material production, coating industry and welding electrode processing due to its low cost, strong adhesion, and outstanding high temperature resistance. Although it has minor defects such as poor water resistance and high brittleness, its overall performance can be significantly improved through modifications such as adding organosilicon and nanomaterials.
In the future, its innovative applications in environmental engineering (such as soil remediation) and new energy materials (such as battery binders) are worth paying attention to. Compared with lithium silicate and sodium silicate, potassium water glass focuses more on application stability and environmental adaptability, and is a high-quality representative of industrial basic silicate materials.
The core performance parameters of liquid potassium silicate include Baumé degree, modulus, and solid content. Conventional industrial liquid potassium silicate has a Baumé degree ranging from 35°Bé to 50°Bé and a modulus between 2.5 and 3.9
Low-modulus liquid potassium silicate (2.5–2.6) has high alkalinity and fast curing speed, suitable for agricultural soil improvement, detergent production and rapid bonding engineering; high-modulus liquid potassium silicate (3.3–3.9) has high viscosity and excellent high-temperature resistance, ideal for fireproof materials, high-temperature resistant coatings and welding electrode manufacturing. As a ready-to-use industrial raw material, liquid potassium silicate saves production time and labor costs for downstream enterprises, making it the preferred product for most potassium silicate supplier cooperative customers.
In addition to standard industrial grades, high-purity liquid potassium silicate is also available for special industries such as fine chemical synthesis and environmental protection water treatment. Strict quality control during production ensures that liquid potassium water glass has no precipitation, stable storage performance, and will not deteriorate or layer within the valid storage period, fully adapting to continuous industrial production operations.
Liquid Potassium Silicate Modulus 3.9-4.0
High-purity modulus 3.9-4.0 potassium silicate liquid with balanced SiO₂-K₂O ratio, stable alkalinity and low impurities. This premixed liquid silicate mixes easily with most chemical additives, widely applied in construction hardeners, welding coatings, fireproof materials, industrial cleaning agents, precision casting and agricultural nutrient additives.
Liquid Potassium Silicate Modulus 3.3-3.4
High-purity modulus 2.3–3.4 liquid potassium silicate solution with stable alkalinity and low impurities. Ready-to-use water glass with great compatibility, strong bonding, heat and weather resistance for coatings, construction, casting, welding, fire retardants and agricultural fertilizers.
Liquid Potassium Silicate Modulus 2.5-2.6
High-purity liquid potassium silicate with balanced SiO₂-K₂O modulus, stable alkalinity and low impurity content. Ready-to-dilute, fully compatible with most industrial additives, widely applied in welding materials, construction hardening agents, flame retardant coatings, casting binders and agricultural silicon fertilizer production.
Potassium Silicate Specifications
Solid Potassium Silicate Properties
| Items | Unit | Item No.WNF-KS32 | Item No.WNF-KS39 |
| Appearance | —— | Irregular glassy lumps, white, light grey or faint pale blue, semi-transparent, no visible contaminants | Irregular glassy lumps, white, light grey or faint pale blue, semi-transparent, no visible contaminants |
| Modulus(n) | —— | 3.1-3.3 | 3.9-4.0 |
| Soluble solids | % | ≥99.0 | ≥99.0 |
| SiO₂ | % | 66-68 | 70-71 |
| K₂O | % | 32-33 | 28-29 |
| Bulk Density | g/cm³ | 2.4-2.5 | 2.4-2.5 |
| pH Value (1% Aqueous Solution, 25℃) | —— | 11-13 | 11-13 |
Powder Sodium Silicate Properties
| Items | Unit | Item No. WNF-KP25 | Item No. WNF-KP28 | Item No. WNF-KP32 |
| Appearance | —— | White free-flowing fine powder | White or light gray powder | White or light gray powder |
| Modulus(n) | —— | 2.3-2.5 | 2.7-2.9 | 3.1-3.3 |
| SiO₂ | % | 48-54 | 60.8-62.4 | 63.8-65.2 |
| K₂O | % | 31-35 | 33.7-35.4 | 30.9-35.3 |
| Bulk Density | g/ml | 0.5-0.8 | 0.5-0.8 | 0.5-0.8 |
| Whiteness | —— | ≥90 | ≥90 | ≥90 |
| Dissolution Speed | s | ≤100 | ≤100 | ≤100 |
| pH Value (1% Aqueous Solution, 25℃) | —— | 11-13 | 11-13 | 11-13 |
Liquid Potassium Silicate Properties
| Items | Unit | Item No. WNF-PL25 | Item No. WNF-PL33 | Item No. WNF-PL39 |
| Appearance | —— | Colorless and transparent liquid | Colorless and transparent liquid | Colorless and transparent liquid |
| Modulus(n) | —— | 2.5-2.6 | 3.3-3.4 | 3.9-4.0 |
| Baume Degree | ° | 50±1 | 38±1 | 30±1 |
| SiO₂ | % | 31-35 | 26-27 | 19-22 |
| K₂O | % | 20-21 | 12-13 | 7.45-8.84 |
| Fe | ppm | ＜100 | ＜100 | ＜100 |
| Water insoluble | % | ＜0.03 | ＜0.03 | ＜0.03 |
Applications of Potassium Silicate
Potassium silicate (potassium water glass) is a high-performance inorganic silicate material featuring adjustable modulus, excellent high-temperature resistance, strong adhesive force, outstanding alkalinity stability, and eco-friendly properties.
With unique physical and chemical advantages different from sodium silicate, it has become an indispensable core raw material in protective coating production, welding electrode manufacturing, modern agricultural planting, concrete reinforcement, and refractory material industries. Below is a detailed introduction to its core application scenarios and functional mechanisms.
Adhesives & Binders(Welding Electrodes)
Potassium silicate serves as a professional high-quality binder and coating agent for welding electrode production, which is one of its most mature and high-demand application scenarios.
Different from sodium silicate, potassium silicate has better viscosity stability and moderate curing speed, which can perfectly bond various mineral powder raw materials for electrode coatings and ensure uniform coating density and smooth surface of welding rods.
During the welding process, the potassium silicate coating will decompose and form a compact protective slag layer at high temperature. This slag layer can effectively isolate oxygen and nitrogen in the air, prevent the welding seam from oxidation and nitriding, reduce welding defects such as air holes and slag inclusions, and significantly improve the compactness, tensile strength and welding toughness of the welding joint.
Moreover, potassium silicate can optimize the arc stability of welding electrodes, make the welding arc burn smoothly, reduce splashing, and improve welding efficiency and molding effect. It is widely used in low-carbon steel electrodes, alloy steel electrodes and special industrial welding electrodes, and is a preferred adhesive material for high-standard welding rod manufacturers.
Protective Coatings
Potassium silicate is a key base material for manufacturing inorganic high-temperature resistant coatings, anti-corrosion coatings, and fireproof protective coatings. Compared with sodium silicate coatings, potassium silicate-based coatings deliver better weather resistance, lower water absorption, and stronger film-forming stability, effectively avoiding whitening, powdering and cracking problems that commonly occur in traditional water glass coatings.
In industrial anti-corrosion fields, potassium silicate forms a dense inorganic protective film on the surface of steel structures, metal equipment, and industrial pipelines after curing. This film isolates air, moisture and corrosive media such as acid and alkali, providing long-term anti-rust and anti-corrosion protection. For high-temperature protective coatings, its excellent thermal stability enables the coating system to withstand continuous high-temperature baking without peeling or failure, widely used in furnace equipment, high-temperature flues, and industrial kiln surface protection.
In addition, potassium silicate is widely applied in exterior wall inorganic fireproof coatings and architectural protective coatings. It features non-toxic, odorless, flame-retardant and breathable characteristics, which conform to modern environmental protection and fire safety standards, and can significantly improve the durability and fire resistance of building surfaces.
Concrete Densifiers
Potassium silicate is an excellent inorganic concrete densifier and hardening agent, widely used in ground reinforcement, concrete curing and cement base modification projects. It can penetrate deep into the internal pores of concrete and react with free calcium hydroxide and cement hydration products to generate insoluble stable silicate crystals.
These newly generated crystals fill the internal gaps and capillary pores of concrete, effectively seal the concrete structure, significantly improve the compactness, hardness and wear resistance of the concrete ground, and solve common problems such as concrete dusting, sanding and low surface strength.
After potassium silicate densification treatment, the concrete ground features high hardness, good abrasion resistance, strong anti-permeability and excellent weather resistance, and will not peel or powder for a long time. It is widely used in industrial factory floors, warehouse floors, parking lot pavements, and commercial building concrete ground reinforcement projects, greatly extending the service life of concrete facilities.
Refractory Materials
With ultra-high temperature resistance, stable chemical properties and strong high-temperature bonding strength, potassium silicate is an ideal inorganic binder for various amorphous refractory materials and shaped refractory products. It is widely used in refractory castables, refractory mortars, high-temperature furnace lining materials and thermal insulation refractory materials.
During high-temperature operation of industrial kilns, furnaces and thermal equipment, potassium silicate can maintain stable bonding performance without softening or decomposing at high temperature. It can tightly bond refractory aggregate and powder materials to form a complete and high-strength refractory structure, effectively improving the overall high-temperature scouring resistance, thermal shock resistance and fire resistance of refractory layers.
Compared with traditional sodium silicate refractory binders, potassium silicate refractory materials have lower reburning loss, better high-temperature volume stability and longer service life. They are widely used in metallurgical furnaces, chemical kilns, power plant thermal equipment, building material kilns and other high-temperature industrial scenarios, providing reliable high-temperature protection for industrial thermal equipment.
Advantages of Potassium Silicate
Potassium silicate stands out among inorganic silicate materials due to its superior and comprehensive performance compared with conventional sodium silicate. It integrates high structural stability, environmental friendliness and excellent mechanical and temperature resistance properties, making it a premium raw material for coatings, welding, construction, agriculture and refractory industries.
High silica content
Potassium silicate features stable and high effective silica content with adjustable modulus ranging from 2.5 to 3.9. High silicon composition ensures stronger film-forming performance, better structural compactness and higher reaction activity. It delivers more stable bonding, denser curing effect and better high-temperature structural stability than ordinary water glass, laying a solid foundation for high-strength refractory materials and protective coatings.
Excellent adhesion
This product possesses outstanding inorganic adhesive force, which can firmly bond with metal, cement, mineral aggregate, glass and other base materials. It forms a tight and integrated composite structure after curing without hollowing or peeling. The stable viscosity and uniform bonding performance greatly improve the structural firmness of welding electrode coatings, refractory castables and concrete reinforcing layers.
High heat resistance
Cured potassium silicate forms an inorganic silicate skeleton with ultra-high thermal stability. It does not soften, decompose or fail under long-term high-temperature operating conditions, and maintains stable structural strength and bonding performance. It effectively resists high-temperature scouring and thermal shock, perfectly adapting to high-temperature working scenarios of industrial kilns, furnace linings and high-temperature protective coatings.
Strong alkali resistance
With inherent stable alkaline chemical properties, potassium silicate maintains excellent structural stability in long-term alkaline environments, avoiding hydrolysis, pulverization and performance attenuation. It can effectively resist alkali corrosion and medium erosion, greatly improving the durability of coatings, concrete and refractory materials in complex working conditions.
Fast curing
Different from sodium silicate which is prone to whitening, pulverization and water absorption, potassium silicate has excellent outdoor weather resistance. It can resist ultraviolet aging, rain erosion, temperature difference change and natural wind erosion for a long time. The cured film and structural layer remain intact and stable for years, significantly extending the service life of outdoor protective coatings and building reinforcement materials.
Technical Articles About Potassium Silicate
Sanlee Potassium Silicate Factory Packing And Supply
As a professional integrated potassium silicate factory and potassium silicate supplier, Sanlee Chemical provides standardized packaging, flexible supply and global delivery services for all industrial potassium silicate products including liquid potassium silicate, solid potassium silicate and instant powdered potassium silicate.
We have large-scale production bases and sufficient inventory reserves, which can stably supply bulk orders and customized orders to ensure timely delivery for customers worldwide.
Packaging for Potassium sodium silicate: IBC tanks / 200L plastic drums / 25KG small pails
Powder potassium silicate packing :25kg woven bag
Solid potassium silicate packing:jumbo bag / bulk bag
Frequently Asked Questions
What is potassium silicate?
Potassium silicate, commonly known as potassium water glass, is a high-performance inorganic chemical compound composed of potassium oxide and silicon dioxide, with a general chemical formula of K₂O·nSiO₂.
It is available in liquid, solid, and instant soluble powder forms.
Featuring adjustable modulus (2.5–3.9), excellent adhesion, high-temperature resistance, alkaline stability and eco-friendly properties, it is a premium upgraded alternative to traditional sodium silicate for industrial and agricultural applications.
What is potassium silicate used for?
Potassium silicate covers a wide range of professional application scenarios, mainly including protective coatings, welding electrode manufacturing, agricultural planting, concrete densification and hardening, as well as refractory material production.
It acts as a high-temperature resistant binder, anti-corrosion coating base material, soil conditioner, concrete hardening agent, and refractory adhesive. With stable performance and low volatility, it is widely applied in industrial manufacturing, building reinforcement, fireproof engineering and modern green agriculture.
Is potassium silicate waterproof?
Potassium silicate itself is water-soluble and does not have immediate waterproof performance in its original state.
After curing and complete chemical reaction, it forms a dense, hard and insoluble inorganic silicate crystal structure.
The cured layer features excellent water resistance, impermeability and moisture resistance, which can effectively block water penetration. It greatly improves the waterproof and anti-seepage performance of concrete, coatings and refractory layers, solving water erosion and pulverization problems of traditional silicate materials.
Is potassium silicate safe?
Yes, industrial and agricultural grade potassium silicate is safe, non-toxic, low-VOC and environmentally friendly.
It contains no heavy metals, toxic ingredients or volatile organic compounds, and will not produce harmful gases during use.
It complies with international environmental protection and industrial safety standards. With stable chemical properties, it causes no pollution to soil, water and air, and can be safely used in agricultural improvement, building construction and industrial production.
Can potassium silicate be used in agriculture?
Absolutely. Potassium silicate is a high-quality green agricultural auxiliary material rich in soluble silicon and potassium elements.
It can improve soil salinization and hardening, regulate soil pH value, and activate soil trace nutrients.
Sprayed or applied to soil, it thickens crop cell walls, enhances crop resistance to drought, cold, lodging, diseases and insect pests, reduces pesticide usage, and effectively promotes crop growth and improves yield and quality.
It is widely applicable for grain crops, fruits, vegetables and greenhouse planting.
What modulus of potassium silicate should I choose?
The selection depends on your specific application scenarios.
Low-modulus potassium silicate (2.5–2.6) features high alkalinity and fast curing speed, suitable for agricultural soil conditioning, detergent raw materials and rapid concrete hardening projects.
High-modulus potassium silicate (3.3–3.9) has high viscosity, excellent compactness and superior high-temperature resistance, perfect for protective coatings, fireproof materials, refractory binders and high-standard welding electrodes.
For general industrial comprehensive use, conventional medium modulus products with stable performance are available for customized matching.
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