Calcium carbonate is one of the most widely used mineral fillers across industries such as plastics, coatings, rubber, paper, and construction. One of the most frequently asked questions by buyers and formulators is: what mesh sizes are commonly available for calcium carbonate, and how are they used?
In traditional industry communication, the fineness of calcium carbonate is often expressed in mesh size, which refers to the number of openings per inch in a standard sieve. In simple terms, the higher the mesh number, the finer the powder.
The most commonly used mesh sizes of calcium carbonate include 200, 325, 400, 600, 800, 1000, 1250, 1500, 2000, 3000, and even up to 5000 mesh. Each range serves different application needs.
-
200–325 mesh calcium carbonate is considered relatively coarse and is mainly used in construction materials, dry mortar, putty, and low-cost fillers where surface smoothness is not critical.
-
400–800 mesh grades are widely used in rubber compounds, PVC products, and general-purpose plastics, offering a good balance between cost, dispersion, and mechanical reinforcement.
-
1000–1500 mesh calcium carbonate is commonly selected for higher-quality plastics, coatings, and adhesives, where better surface finish and improved processing performance are required.
-
2000–3000 mesh and above fall into the ultra-fine category. These products are typically used in high-end coatings, inks, paper coating, and engineered plastics, where whiteness, smoothness, and particle uniformity are critical.
It is important to note that mesh size is a traditional and approximate indicator. For very fine calcium carbonate (usually above 1250 mesh), mesh alone can no longer accurately describe particle size. This is why many modern manufacturers also provide laser particle size data.
In summary, mesh size remains a useful reference for quick communication, but understanding the application requirements is key when selecting the right calcium carbonate grade.
