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Explain the difference between talc and calcium carbonate powder in the filler masterbatch

      To make a filler masterbatch, everyone in the industry knows that both calcium carbonate and talc can be added. In the plastic products, the filler masterbatch reduces the cost, reduces the product shrinkage rate, increases the specific gravity, and increases the hardness of the product.

      Calcium carbonate powder and talc powder look like the same, but there are certain differences, and the performance of the product will also be different.

      Calcium carbonate is an inorganic compound with a molecular formula of CaCO3. Commonly known as: limestone, marble, calcite. It is an inorganic compound that is neutral, substantially insoluble in water, and soluble in hydrochloric acid. Types of industrial calcium carbonate: heavy calcium carbonate (heavy calcium), activated calcium carbonate (active calcium), light calcium carbonate (light calcium), nano calcium carbonate (nano calcium). Heavy calcium products are mainly used in the papermaking, rubber and plastics industries. The filling amount is generally large, mainly as a volume filler, which reduces the manufacturing cost of the applied products. Light calcium products have a relatively wide range of applications, mainly volume filling, while nano calcium carbonate products are often used as functional fillers such as modification or reinforcement in the application process, and the filling amount is generally small. The main application areas of light calcium carbonate products are plastics, rubber, paints, adhesives and inks.

      Talc is a magnesium silicate mineral belonging to the trioctahedral mineral and its structural formula is (Mg6)[Si8]O20(OH)4. The talc is generally in the form of block, blade, fiber or radial, and has a slippery hand. It has the characteristics of small hardness and high melting point. Talc powder has good insulation for electricity and heat, low expansion and contraction force, high dispersibility, strong hiding power, good oil absorption and hydrophobicity, large slipperiness, small friction coefficient, stable chemical properties, acid and alkali corrosion resistance. Due to its stable chemical properties, it is widely used in paper, chemical, paint, ceramics, cable, rubber and other industries. 

Similarities and differences in application areas

     Both talcum powder and calcium carbonate powder are mainly used as fillers. The main functions of the talcum powder are as follows: filling the masterbatch in the plastic product, one is to reduce the cost, the second is to reduce the product shrinkage rate, and the third is to increase the proportion. The fourth is to increase the hardness of the product.

      Differences in application characteristics between talc and calcium carbonate powder: The shape of talc is flake-shaped, so it has higher rigidity, dimensional stability and heat-resistant temperature, and the reinforcing effect is good. Calcium carbonate is generally granular, so its rigidity and other aspects are not as good as talc, but its price is lower, whiteness is high, and the impact on plastic impact toughness is small.

     Talc has a nucleating effect on polypropylene, and calcium carbonate is not effective in this respect. Calcium carbonate can generally be divided into light calcium carbonate and heavy calcium carbonate, while talc does not have this distinction. Talc powder is ground from natural minerals.

      Choosing the right economical filler (talc or calcium carbonate powder) will be perfect for self-operated plastic products!


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