Calcium bicarbonate powder is not equal to talcum powder, but calcium bicarbonate powder sometimes has the same use as talcum powder, but calcium bicarbonate powder talcum powder is not identical, the nature of the use of some differences.

   Heavy calcium powder

   Calcium bicarbonate is the abbreviation of heavy calcium carbonate, molecular formula CaCO3, relative molecular weight 100.00.

   Properties of Calcium Heavy Carbonate

   White powder, colorless and odorless. Stable in air. Almost insoluble in water, insoluble in alcohol. When meet dilute acetic acid, dilute hydrochloric acid, dilute nitric acid, bubble boiling, and dissolve. Heated to 898℃, it starts to decompose into calcium oxide and carbon dioxide.

   Heavy Calcium Powder / Heavy Calcium Carbonate is made by grinding natural carbonate minerals such as calcite, marble, limestone. It is a commonly used powdered inorganic filler with the advantages of high chemical purity, high inertness, not easy to chemical reaction, good thermal stability, no decomposition below 400℃, high whiteness, low oil absorption, low refractive index, soft, dry, does not contain crystalline water, low hardness, low abrasion value, non-toxic, tasteless, odorless, good dispersibility.

   Usage of calcium bicarbonate powder/heavy calcium carbonate

   Usually used as filler, widely used in artificial floor tiles, rubber, plastics, papermaking, paints, lacquers, inks, cables, building supplies, food, medicine, textiles, feed, toothpaste and other daily-use chemical industry, as a filler to increase the volume of the product to reduce the production cost.

   Talc

   The main component of talcum powder is talc containing aqueous magnesium silicate, molecular formula for Mg3 [Si4O10] ( OH) 2. Talc is a monoclinic crystal system. Crystals are pseudo-hexagonal or rhombic flakes, occasionally seen. It is usually in the form of dense masses, blades, radials, and fibrous aggregates. It is colorless and transparent or white, but with a few impurities it appears light green, light yellow, light brown, or even light red; it has a pearly luster on the cleavage plane. Hardness 1, specific gravity 2.7 ~ 2.8.

   Talc has excellent physical and chemical properties such as lubricity, anti-adhesion, flow-assisting, refractory, acid-resistant, insulating, high melting point, chemically inactive, good covering power, soft, glossy, strong adsorption, etc. Because the crystalline structure of talc is layered, so it has the tendency to split into scales easily and special slippery, if the content of Fe2O3 is very high then it will reduce its insulating properties.

   Heavy calcium powder talcum powder use difference

   First, talc and calcium carbonate are both used for filling, and their purposes are mainly:

   1 Increase dimensional stability (that is, shrinkage reduction)

   2 Increase the stiffness of the material

   3 increase the heat resistance of the material

   4 reduce material costs and other aspects

   But also has its defects: 1 density increase 2 bad use, impact toughness decreased 3 material gloss has decreased

   Second, talc and calcium carbonate have the same particle size distinction, generally 300 mesh, 600 mesh, 800 mesh, 1250 mesh and 2500 mesh, of course, there are finer, and generally used in plastics can be selected inside the 800 mesh and 1250 mesh of these two, which can make the highest performance/price ratio.

   Third, the price of talcum powder fluctuates, generally speaking, according to the mesh to set the price will not be too big a problem, for example: 800 mesh general price of 700 to 850 yuan, 1250 mesh is also in the 1000 to 1280 yuan. The price is too high or too low is not normal.

   About the use of talcum powder and calcium carbonate

   1. Talcum powder is in the shape of flakes, so it has higher stiffness, dimensional stability and heat-resistant temperature, and good reinforcing effect.

   2. Calcium carbonate is generally granular, so its stiffness and other aspects are not as good as talcum powder, but its price is cheaper, and whiteness is high, while the impact of plastic toughness has little effect.

   3. Talc has a nucleating effect on polypropylene, while calcium carbonate is not obvious in this regard.

   4. Calcium carbonate can generally be divided into light calcium carbonate and heavy calcium carbonate, while talc does not have this distinction, talc is ground from natural minerals.