Superfine silica
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Any solid substance has a fixed shape and occupies a corresponding space, that is, has a certain size. Generally speaking, powder or fine particles generally refer to solid substances with a size of less than 1mm. When the particle size of solid particles is between 0.1 and 10μm, it is called fine particles, or sub-ultrafine particles. Most of the dust floating in the air falls into this range. When the particle size reaches 0.1pm or less, it is called ultrafine particles. Ultrafine particles are divided into large, medium and small ultrafine particles.
