Basic knowledge and application of talc powder and calcium carbonate

1, talcum powder and calcium carbonate is used for filling, its main purpose are: 1, increase the dimensional stability (i.e., shrinkage reducing), 2, and increase the stiffness of the material, 3, increase material heat-resisting performance, four, from several aspects, such as reducing the cost of materials but also has its drawbacks: 1, the density increases, 2, use bad, impact toughness drops, 3, material luster fell.

2, talcum powder and calcium carbonate as distinguished by granularity, generally is 300 mesh, 600 mesh, 800 mesh, 1250 mesh and 2500 mesh, of course, there is a thin, and commonly used in plastic can choose 800 mesh and 1250 mesh between the two, so that we can make the performance/price is highest.

Talcum powder price fluctuate, generally speaking, according to the mesh price won't have too big problem, for example: 800 mesh price is in commonly 800 to 950 yuan between, 1250 in 1000 to 1280 yuan between. It is not normal for prices to be too high or too low.

On the difference between talc powder and calcium carbonate:

1. The shape of talc is sheet, so it has higher rigidity, dimension stability and heat resistance temperature, with good enhancement effect.

2. Calcium carbonate is generally granular, so its rigidity and other aspects are not as good as talc powder, but its price is lower, and its whiteness is high, and it has little impact on the impact toughness of plastics.

3. Calcium carbonate can be generally divided into light calcium carbonate and heavy calcium carbonate, but talc powder does not have this distinction. Talc powder is ground out from natural minerals.

4. Talc powder has nucleation effect on polypropylene, while calcium carbonate has no obvious effect on this.

Talcum powder