CaCO3 powder, also known as calcium carbonate powder, is commonly added to plastic pellets for several reasons:

1. Reduced Cost: CaCO3 powder is an inexpensive filler material compared to pure plastic resins. By adding CaCO3 powder to plastic pellets, manufacturers can reduce the amount of expensive plastic resin needed while maintaining the volume of the plastic. This helps reduce the cost of producing plastic products.

2. Improved mechanical properties: CaCO3 powders improve the mechanical properties of plastic materials. If added in the right amount, it can improve the stiffness, strength and impact resistance of plastic products. the presence of CaCO3 powders improves the dimensional stability of plastic parts and reduces shrinkage during processing and use. 3. Density regulation: The addition of CaCO3 powders helps to reduce the density of plastic products.

3. Density Adjustment: The addition of CaCO3 powders allows manufacturers to adjust the density of plastic products. CaCO3 is a high density material compared to most plastic resins. By adding CaCO3 to plastic pellets, the overall density of the plastic product can be increased or decreased depending on the desired application. This facilitates the achievement of specific weight requirements or balances the weight distribution of the plastic product. 4.

4. Improved Processability: CaCO3 powder can be used as a processing aid in the manufacture of plastics. It helps to improve the flow properties of the molten plastic, fill the molds better, and reduce the chance of defects such as voids or dents, etc. The presence of CaCO3 powders also helps to control the cooling rate of the plastic, preventing warping or distortion after molding.

5. Environmental Benefits: Adding CaCO3 powder to plastic pellets helps to reduce the carbon footprint. Because CaCO3 powder is less expensive and more readily available, it is often used as a filler material rather than relying exclusively on plastic resins. This approach reduces the consumption of fossil fuel plastics and promotes the sustainable use of resources.

6. Improved heat resistance of plastics: The addition of CaCo3 powders to common plastics improves the heat resistance of plastics. If about 40% of CaCo3 powder is added to PP, its heat resistance can be increased by about 200 ℃. When the filling rate is less than or equal to 20%, the heat resistance can be increased by 8~130℃. 7.

7. Improve the light diffusion of plastics: Calcium carbonate powder with whiteness above 90 has obvious whitening effect in plastic products. In calcium plastic paper, in low-density polyethylene and high-density polyethylene film, the addition of calcium carbonate powder can achieve the effect of light diffusion and extinction, making it suitable for writing and printing. Calcium carbonate powder with better whiteness can also replace expensive white pigments.

8. It can make the products have some special properties: adding calcium carbonate powder can improve the plating and printing performance of some products. Adding trace amounts of calcium carbonate powder in PVC has a certain flame retardant effect.

It is important to note that the exact amount of CaCO3 powder to be added to plastic pellets and the desired effect may vary depending on the application, the desired properties and the type of plastic used. Manufacturers conduct thorough testing and formulation adjustments to achieve the desired performance and cost effectiveness of their plastic products.

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