The market today has quite a lot of white powders used in different industries, they are divided into two main types: Hiding and non - hiding
Young pigment - hiding
Including some types such as: Calcium carbonate (CaCO 3 ), Talc, Clay or Silicate ...
The property of this group is low refractive index, so the ability to create opacity is quite poor. In addition, due to the availability in nature with large reserves, the price of this group is relatively cheap. They are often used as fillers and fillers for plastics.
White powder hiding
In contrast to the non - hiding group above, the hiding powder group has the ability to create very good opacity for plastic based on its high refractive index.
For this hiding group, it can be said that titanium dioxide (TiO 2 ) is the most important product, widely used in many industries. The reason for this is due to its strong ability to absorb UV radiation, which is dominant to produce high opacity and white color. Not only that, TiO 2 also has good anti-aging properties and is less toxic.
In addition, there are some other commercially hiding white powder such as: Zinc oxide (ZnO), Zinc sulfite (ZnSO 3 ), lithopone (mixture of ZnS and BaSO 4 ), anthony oxide ...
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