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Hollow glass microspheres are small spherical materials that are hollow and contain gas. They are unique and stable hollow particles with the advantages of light weight, large volume, low thermal conductivity, good dispersion, flowability, and stability. In addition, it also has excellent properties such as insulation, self-lubricating, sound insulation, non water absorption, corrosion resistance, radiation resistance, and non toxicity. Due to its unique hollow structure, physical and mechanical properties, and stable chemical properties, as a non-metallic material additive, it is non-toxic, colorless, odorless, and widely used. It will become the mainstream of new composite materials in the 21st century.
| Category NO | Sieve Size | Standard diameter((μm) |
| 30# | 20-40 | 850-425 |
| 40# | 30-40 | 600-425 |
| 60# | 40-60 | 425-300 |
| 80# | 60-100 | 300-150 |
| 100# | 70-140 | 212-106 |
| 120# | 100-140 | 150-106 |
| 150# | 100-200 | 150-75 |
| 180# | 140-200 | 106-75 |
| 220# | 140-270 | 106-53 |
| 280# | 200-325 | 75-45 |
1. Reduce the dielectric constant of the material
The Dk value of hollow glass microspheres is 1.2-2.2 (100MHz), which can effectively improve the dielectric properties of the material.
2. Lightweight, reducing costs
Hollow glass microspheres have a light specific gravity and a large volume, with a density typically ranging from 0.2 to 0.6 g/cm3, which is one tenth of the density of traditional filling particles. This reduces the weight of the material and has a low oil absorption rate. Even with high addition amounts, the viscosity does not increase significantly, which can greatly reduce the amount of raw resin used, decrease the amount of plasticizer used, increase the filling amount, and reduce costs.
3. Improve the processing performance of materials
Hollow glass microspheres have high dispersibility and good flowability, which can reduce the viscosity and internal stress of resins, overcome warping, eliminate glass fiber exposure, ensure product dimensional stability, and improve production efficiency.
4. Improve the mechanical properties of materials
Hollow glass microspheres filled with plastic can greatly increase the hardness and elastic modulus of the material, as well as improve its stiffness and stress damping ability. However, its impact resistance decreases. Surface modification treatment, such as coupling agent pretreatment of hollow glass microspheres, can be used to reduce the impact resistance of the material.
5. Improve the flame retardant and thermal insulation properties of materials
The interior of hollow glass microspheres is mainly composed of suffocating gases such as nitrogen and carbon dioxide, which can improve the flame retardancy of the material. The material has poor density and thermal conductivity, which can enhance its insulation performance.
There are many specifications for hollow glass microspheres, and the smaller the density and the larger the particle size, the better the weight reduction effect. However, at the same time, the lower the compressive strength, the more likely it is to be crushed under compression, resulting in an increase in product density. Therefore, it is necessary to choose the appropriate strength of hollow glass microspheres according to the production and preparation process of the product, and add them at a slower mixing speed in the final stage of mixing.
