Many people, when they first hear the term “glass powder,” instinctively associate it with crushed glass particles or raw material for glass production. In fact, glass powder is a high-transparency, scratch-resistant filler with fine particle size, excellent dispersibility, high transparency, and good anti-settling performance. After surface modification, it gains strong affinity and steric hindrance, allowing it to disperse easily in coatings. Once film-forming, it enhances coating fullness and produces crystal-clear primers that maintain transparency while offering superior scratch resistance. Modern glass powder grinding technology further ensures uniform particle size distribution and improved performance in advanced coating systems.
The primary raw material of glass powder is selected silica sand, with high-purity silicon dioxide (SiO₂) as its core component. As a widely used industrial raw material, SiO₂ features a high melting point, high hardness, and excellent chemical stability. In addition, glass powder also contains certain proportions of borates, sodium oxide, aluminum oxide, and other components. The ratio of these components directly affects its construction performance in various applications. Generally, the higher the mesh size, the finer the particles and the better the product performance. Common mesh sizes available on the market include 200 mesh, 325 mesh, 400 mesh, 800 mesh, 1250 mesh, 2000 mesh, 2500 mesh, and 3000 mesh.
Main Characteristics of Glass Powder
- Appearance: White powder
- Whiteness: ≥94
- Average Particle Size: 2.5 ± 0.5 μm
- Specific Gravity: 2.7 g/ml
- Oil Absorption: 28 ± 2.5 g/100 g
- Mohs Hardness: 7.8
- Chemical Composition: Silicate-based
- High transparency, high hardness, and uniform particle size distribution.
- Excellent dispersibility and strong compatibility with resins and paint systems.
- After surface treatment, it provides coatings with non-bluish films and good recoatability.
- In premium scratch-resistant topcoats, it enhances hardness and toughness, improves scratch resistance, provides matting effect, and significantly increases weather resistance.
- Compared with talc powder, glass powder tends to settle more easily after dilution in paints, so anti-settling measures should be strengthened accordingly.
Applications of Different Mesh Glass Powder
- Low Mesh Glass Powder (200–500 mesh)
Larger particle size, suitable for applications with low fineness requirements, such as building materials. - Medium Mesh Glass Powder (800–1250 mesh)
Moderate particle size, widely used as dispersant and filler in coatings, inks, plastics, and rubber. This is the mainstream specification with broad application. - High Mesh Glass Powder (2000 mesh and above)
Micro-nano grade powder that enhances gloss and transparency, widely used in high-end coatings, inks, and electronic materials.
Application of Jet Mill in Glass Powder Grinding
The refinement of glass powder relies heavily on jet milling technology. This process uses high-pressure airflow to accelerate particles, causing them to collide with each other, achieving contamination-free and energy-efficient ultrafine grinding. It is especially suitable for producing high-mesh (2000 mesh and above) glass powder.
Key advantages of jet milling include:
- Controllable Particle Size: Precise control of D50 values by adjusting air pressure and classifier wheel speed.
- Purity Assurance: Fully enclosed system prevents metal contamination, ensuring SiO₂ purity ≥99.5%.
- Optimized Morphology: Produces spherical or near-spherical particles, enhancing dispersibility and film adhesion.
Epic Powder
As a company with over 20 years of expertise in ultrafine grinding and classification, Epic Powder is committed to providing efficient and clean powder processing solutions. With advanced jet milling technology, Epic Powder enables precise glass powder grinding, producing powders with finer particle size and more uniform distribution, fully meeting the demands of high-end industries such as coatings, plastics, and electronics.