Introduction
Sodium silicate is an inorganic compound made from sodium oxide (Na₂O) and silica (SiO₂). It is commonly known as water glass or liquid glass because of its transparent appearance and strong bonding properties when dissolved in water.
As one of the most important silicate chemicals, sodium silicate is widely used in detergents, construction materials, water treatment, paper manufacturing, foundry, refractory materials, and many other industrial applications.
Depending on the production process and chemical ratio, sodium silicate can be supplied in different forms, including liquid sodium silicate, solid sodium silicate, and powder sodium silicate, with different silica-to-soda ratios (modulus) to meet various industrial requirements.
What is Sodium Silicate?
Sodium silicate is a family of compounds containing sodium oxide (Na₂O) and silicon dioxide (SiO₂). Its chemical formula is generally expressed as:
Na₂O·nSiO₂
The value of n represents the silica modulus, which indicates the ratio between SiO₂ and Na₂O.
The modulus is one of the most important parameters when selecting sodium silicate because it directly affects:
- Alkalinity
- Solubility
- Bonding strength
- Chemical stability
- Application performance
For industrial applications, common sodium silicate modulus ranges from approximately 1.6 to 3.5, depending on customer requirements.
How Is Sodium Silicate Manufactured?
Sodium silicate is mainly produced through two industrial processes:
1.Furnace Process
The furnace process is the most common manufacturing method for solid sodium silicate.
In this process:1.High-purity silica sand (SiO₂) 2.Soda ash (Na₂CO₃) are melted together at high temperatures, usually above 1,000°C.
The chemical reaction forms solid sodium silicate glass, which can then be dissolved into liquid sodium silicate or processed into powder.
The general reaction is:
Na₂CO₃ + SiO₂ → Na₂SiO₃ + CO₂
The furnace process allows manufacturers to control the SiO₂/Na₂O ratio and produce sodium silicate with different modulus levels.
2.Hydrothermal Process
The hydrothermal process produces liquid sodium silicate by reacting silica materials with sodium hydroxide under controlled temperature and pressure conditions.
This method provides better control over:1.Modulus adjustment 2.Product consistency 3.Dissolution characteristics
Liquid sodium silicate produced through this method is commonly used in detergent manufacturing, construction chemicals, and water treatment.
3.Types of Sodium Silicate
Liquid Sodium Silicate
Liquid sodium silicate is the most widely used form.
Typical characteristics:
- Transparent or slightly colored liquid
- Adjustable modulus
- High bonding capability
- Water-soluble
Common applications include:
- Detergent production
- Paper manufacturing
- Concrete additives
- Water treatment chemicals
- Adhesives
Solid Sodium Silicate
Solid sodium silicate is produced as glassy blocks or lumps.
Advantages:
- Easy storage and transportation
- Longer shelf life
- Suitable for further processing
Main applications:
- Powder detergent production
- Silica gel manufacturing
- Welding electrodes
- Refractory materials
Powder Sodium Silicate
Powder sodium silicate is produced by spray drying liquid sodium silicate.
Features:
- Fast dissolution
- Easy handling
- Stable composition
Applications:
- Detergent powder
- Ceramic additives
- Industrial cleaners
- Construction materials
Sodium Silicate Grades and Specifications
Different industries require different sodium silicate specifications.
Key parameters include:Silica Modulus
The silica modulus determines the ratio of silica to sodium oxide.
Higher modulus sodium silicate generally provides:
- Stronger binding properties
- Lower alkalinity
- Better chemical stability
Lower modulus sodium silicate usually provides:
- Higher alkalinity
- Faster reaction ability
- Better cleaning performance
SiO₂ and Na₂O Content
Typical industrial sodium silicate specifications include:
| Parameter | Typical Range |
|---|---|
| SiO₂ Content | 25%–38% |
| Na₂O Content | 7%–16% |
| Modulus | 1.6–3.5 |
| Appearance | Transparent liquid / solid glass |
Specifications can be adjusted according to different application requirements.
Main Applications of Sodium Silicate
1.Detergent Industry
Sodium silicate is an important builder ingredient in detergent formulations.
It helps to:
- Control alkalinity
- Improve cleaning performance
- Stabilize detergent particles
- Prevent corrosion of washing equipment
It is widely used in:
- Powder detergents
- Industrial cleaners
- Dishwashing products
2.Construction Industry
Sodium silicate is used in construction materials because of its excellent binding and sealing properties.
Applications include:
- Concrete hardeners
- Cement additives
- Waterproofing materials
- Soil stabilization
When applied to concrete surfaces, sodium silicate reacts with calcium compounds to form a harder structure, improving surface durability.
3.Foundry Industry
In foundries, sodium silicate is used as an inorganic binder for sand molds.
Benefits include:
- Good bonding strength
- Improved mold stability
- Reduced organic emissions
It is commonly applied in:
- Steel casting
- Iron casting
- Metal processing
4.Paper Manufacturing
Sodium silicate is used in paper production for:
- Deinking processes
- pH adjustment
- Fiber treatment
Its alkaline properties help improve the efficiency of paper recycling.
5.Water Treatment
Sodium silicate can be used in water treatment applications.
Functions include:
- Corrosion inhibition
- Metal ion control
- Pipe protection
It helps create a protective layer inside pipelines, reducing corrosion caused by water systems.
6.Refractory Materials
Due to its heat resistance and bonding ability, sodium silicate is used in refractory products.
Applications include:
- Furnace materials
- Ceramic products
- Heat-resistant coatings
How to Choose the Right Sodium Silicate?
When purchasing sodium silicate for industrial use, buyers usually consider several factors:
1.Application Requirement
Different industries require different properties.
For example:
- Detergent manufacturers usually focus on alkalinity and solubility.
- Foundry users focus on bonding strength.
- Construction companies focus on penetration and hardening performance.
2.Sodium Silicate Modulus
The correct modulus selection is essential.
Lower modulus:
- Higher alkalinity
- Faster reaction
Higher modulus:
- Stronger bonding ability
- Better stability
3.Product Form
Choose according to logistics and production requirements:
- Liquid sodium silicate → suitable for direct use
- Solid sodium silicate → suitable for long-distance transportation
- Powder sodium silicate → suitable for easy mixing and storage
4.Supply Capability
For industrial buyers, stable supply is important.
Key supplier evaluation factors include:
- Production capacity
- Batch consistency
- Packaging options
- Export experience
- Technical support
Why Choose Our Sodium Silicate?
Weifang Changs Chemical Industry Co., Ltd. specializes in the production and export of sodium silicate and inorganic silicon chemicals.
Our sodium silicate supply advantages include:
- Multiple forms available: Liquid, solid, and powder sodium silicate
- Adjustable modulus: Customized SiO₂/Na₂O ratio according to application requirements
- Stable production capacity: Annual output up to 300,000 MT
- Export experience: Serving customers in more than 50 countries
- Flexible packaging: Available in bulk, drums, bags, and customized solutions
We support distributors, detergent manufacturers, construction material producers, and industrial users worldwide.
Frequently Asked Questions About Sodium Silicate
What is sodium silicate used for?
Sodium silicate is mainly used in detergents, construction materials, foundry binders, paper manufacturing, water treatment, and refractory products.
Is sodium silicate the same as water glass?
Yes. Sodium silicate is commonly called water glass or liquid glass because of its glass-like appearance when dissolved in water.
What is sodium silicate modulus?
Sodium silicate modulus is the ratio of SiO₂ to Na₂O. It determines product properties such as alkalinity, solubility, and bonding performance.
What are the different forms of sodium silicate?
The main forms are liquid sodium silicate, solid sodium silicate, and powder sodium silicate.
How should sodium silicate be stored?
Solid and powder sodium silicate should be stored in dry conditions. Liquid sodium silicate should be kept in sealed containers and protected from freezing temperatures.
Conclusion
Sodium silicate is a versatile inorganic chemical with important applications across multiple industries. Its adjustable modulus, strong bonding ability, and chemical stability make it an essential material for detergent manufacturing, construction, foundry, and industrial processing.
Selecting the right sodium silicate supplier requires careful consideration of product specifications, application requirements, production capability, and export experience.
For reliable sodium silicate supply with customized modulus and global delivery support, contact our team for technical specifications and quotation.
