# The effect of the Particle Size of Hollow Glass Sphere

The effect of the Particle Size of Hollow Glass Sphere

Hollow glass Sphere is a micron sized hollow sphere with smooth surface. The particle size of the spheres affects the sphere properties and its application in composite materials directly.

key word

*Particle size,*

*True density,*

*Bulk density,*

*Product with spheres inside*

* The relationship between particle size and volume

For the same true density of hollow sphere, the smaller the particle size, the thinner the wall of spheres; for the same weight product with spheres inside, the smaller the particle size, the larger the space effect. For example, the same true density of 1kg product with spherse inside, the products with smaller size spheres have larger space volume.

* The relationship between particle size and quantity of spheres

With the same true density, the smaller the particle size, the mass quantity of spheres per unit; For the same true density of products with spheres inside, the smaller the particle size, the mass quantity of the spheres, the larger the specific surface area.

* The benefits of small particle size

As mentioned above, a smaller particle size spheres will result in more sphere quantities of the same true density and weight of the product with spheres inside, thus making the distribution of particles in the matrix wider and more uniform, which makes the composite material more homogeneous and more uniform, such as better interface properties, mechanical properties, low thermal conductivity, low dielectric, low warpage, etc.

* Effect of small particle size on oil absorption and matrix viscosity

As mentioned above, a smaller particle size spheres will result in more sphere quantities and a larger volume for the same true density and weight of products with spheres inside, which results in increasing the oil absorption rate and the viscosity of the composite system.

The viscosity of the system can be adjusted by adjusting the system formula, such as increasing the usage amount of solvent or other additives.

Compared with other irregular shape powder particles, the spheres have the smallest surface area to volume ratio, so the oil absorption rate of the same volume of products is much lower than that of other products with irregular powder particles.

* Summary

1、The smaller spheres, the higher value of spheres will be increased.

2、 The smaller spheres will make composites have better properties. The R&D of smaller spheres will be the main trend.

3、The formulation of the composites need to be adjusted according to various sizes, in order to make composites with better properties. The design of the formulation of the composites needs to be made according to sphere size and sphere volume. For example, as for mixing resins with hollow glass sphere, if using smaller size spheres, the adding proportion and ration of other components need to be adjusted. If you wanna reducing the viscosity of matrix, you can decrease the usage amount of sphere or increase the solvent quantity, you can also choose the larger size of spheres.

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