The surface of active calcium carbonate is coated with an organic activator, giving it strong hydrophobic properties. This is the most significant difference between active calcium and inactive products. Identification is also relatively simple: Take a small amount of the product and place it in clear water. After stirring for a period of time, if most of the product floats on the water's surface and the water remains clear and not cloudy, it is active calcium; if the product sinks completely or mostly to the bottom and the water becomes cloudy, it is an inactive product.

　Difference between active and inactive calcium carbonate

　　1. Hydrophobicity

　　The surface of active calcium carbonate is coated with an organic activator, giving it strong hydrophobic properties. This is the most significant difference between active and inactive calcium carbonate. A simple identification method is to place a small amount of the product in clear water. After stirring for a period of time, if most of the product floats on the water's surface and the water remains clear, it is active calcium carbonate. If the product sinks or mostly sinks and the water becomes cloudy, it is inactive calcium carbonate.

　　2. Flowability

　　Active calcium carbonate products, due to their surface coating of organic activator molecules with low surface tension, have lower surface energy than unactivated products. This reduces the viscous resistance between particles and improves their flowability. Therefore, the powder exhibits liquid-like flowability, while inactive products have significantly poorer flowability. Note that comparisons should be made under the same conditions of temperature, humidity, and product moisture content.

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　　3. Dispersibility

　　The difference in dispersion can be seen from the good flowability of active calcium carbonate products. Active calcium carbonate products, due to their good dispersibility, exhibit good compatibility and dispersibility with the base material during application. They also have stronger penetration ability and are more likely to form dust. Products packaged in ordinary woven bags produce considerable dust during handling and use.

　　4. Different Particle Sizes

　　Because the surface activator in active calcium carbonate products reduces the surface energy of the particles, weakening the agglomeration and binding force, the particle size is significantly reduced. This difference can be clearly distinguished using a scanning electron microscope.

　　5. Different Oil Absorption Values

　　The reduced particle size in active calcium carbonate products leads to reduced porosity between particles, and the microscopic surface becomes smoother. Therefore, when testing the oil absorption value, active calcium carbonate products have a lower value than inactive products.

　　6. Different Calcium Carbonate Content

　　Active calcium carbonate products generally contain 1.0%-5.0% organic activator, so their calcium carbonate content is 1%-5% lower than inactive products. The smaller the particle size of the active calcium carbonate product (such as nano calcium carbonate), the higher the surface activator content and the lower the calcium carbonate content.