Q
what is polypropylene chalk
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Polypropylene chalk, also known as calcium carbonate filler, is not actually "chalk" in the traditional sense but a term used in the plastics industry. It refers to additives mixed into polypropylene (a thermoplastic polymer) to improve specific properties of the final product. Polypropylene is widely used due to its excellent chemical resistance, flexibility, and thermal stability. However, pure polypropylene can be expensive, so manufacturers often add fillers like calcium carbonate (the main component of chalk) to reduce costs while maintaining desired characteristics. These fillers can improve stiffness, heat deflection temperature, and dimensional stability. The addition of calcium carbonate filler does not affect the recyclability of polypropylene, making it an environmentally friendly choice. Despite these benefits, excessive filler content can decrease impact strength and ductility. Therefore, the right balance must be achieved for optimal performance.
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