Heavy calcium carbonate is also known as ground calcium carbonate, short for GCC. It is made by ground carbonate minerals, such as calcite, marble, and limestone. GCC is a kind of common inorganic powdery filler. GCC is of high chemical purity, and it is not easy for GCC to have chemical reactions. Besides, GCC also has good thermostability; it will not decompose at any temperature lower than 400℃. GCC has high whiteness, good dispersity, low oil absorption rate, low refractive index, low hardness, and small wear value. GCC is soft, dry, nontoxic, flavorless, and odorless; it doesn’t contain crystal water. Heavy calcium carbonate is very stable in the air. It is almost insoluble in water, and it is not insoluble in alcohol. It will be intumescent and decompose when mixed with dilute acetic acid, dilute hydrochloric acid, and dilute nitric acid. It will begin to decompose into calcium oxide and carbon dioxide at a temperature of 898℃.