Pigments are materials used as colorants for paints, inks, plastics, rubber, adhesives, dyes, and ceramics and building materials, and are generally insoluble in water, oil or solvent. It is a white or colored inorganic or organic compound that is dispersed in the medium (or base material) in the form of fine particles during application. Pigment particles themselves do not have the ability to dye objects, but are fixed on the surface of objects or finely dispersed in the base material to achieve coloration, and play the role of decoration and protection (such as anti-rust, anti-corrosion, anti-radiation, etc.). Non-metallic mineral pigments are inorganic fillers. Except for pearlescent mica, most non-metallic mineral pigments are extender pigments, which have both coloring and filling functions. They are widely used in coatings, paper products, rubber, plastics, inks and other fields. In addition to coloring, non-metallic mineral fillers have the following functions:

1. Increase the thickness of the coating film, improve the wear resistance, weather resistance, heat resistance, chemical corrosion resistance, scrub resistance and other properties of the coating, and play a skeleton role in coatings and inks while adjusting the light absorption or reflection properties of the coating.

2. Increase the whiteness and opacity of the paper, and improve the writing performance and printing performance or ink absorption performance of the paper.

3. Improve the wear resistance, weather resistance, heat resistance, flame retardation, flame retardant and optical properties of rubber and plastic products.

4. Improve the physical properties of the adhesive, such as reinforcement, rheology, increase opacity and give it flame retardant and electrical insulation properties.

5. Reduce production costs. Generally, the price of non-metallic mineral pigments is lower than that of other inorganic pigments, and the amount of addition is larger.