Comprehensive Guide to Calcium Carbonate Analysis and Specifications

Introduction to Calcium Carbonate; a Base Mineral Material in Mode Industries

Calcium carbonate, with the chemical formula CaCO3, is one of the most abundant and widely used mineral materials in today’s industry. It serves as a base mineral filler in dozens of industries, from plastics and paints to papermaking and engineered products. Due to its natural abundance, economical price and unique technical properties, it is an ideal option for reducing production costs while improving final product quality. In fact, a large part of the success of the polymer and paint industries in recent years has depended on the smart and purposeful use of this mineral material.

In nature, calcium carbonate is found as limestone, marble, gypsum and other calcareous rocks. Through extraction, crushing, very fine grinding and, if required, surface coating processes, it is converted into industrial products with various particle size distributions. At the Amiran Kani Sang Project, this mineral material is produced and selected for polymer, paint, paper and engineered product applications, meeting the diverse needs of industrial customers across a wide range of particle sizes.

Why have various industries tued to calcium carbonate? There are several reasons for this choice. First, this material acts as an active filler; it not only increases the volume of the product but also improves mechanical properties such as stiffness, compressive strength and dimensional stability in many cases. Second, it increases production speed in plastic extrusion and injection processes by changing the melt flow behavior. Third, in paints and coatings it acts as an economical white pigment and covering agent, and in papermaking it significantly raises brightness and printability.

In today’s market, products such as PVC/UPVC profiles and pipes, masterbatch, cables, artificial leather, paints, paper, adhesives and engineered stone caot be produced economically without this mineral material. For this reason, precise analysis and a complete understanding of calcium carbonate specifications before purchase is a technical necessity, because each application requires a different particle size distribution, product type (coated or uncoated) and purity level.

In this comprehensive guide, we examine the chemical analysis, particle size range from 100 to 3500 mesh, main applications, how to choose the suitable mesh and storage tips for this product in a specialized maer, so you can make the best purchasing decision for your production line.

Chemical Analysis and Technical Specifications of Calcium Carbonate

Analysis of calcium carbonate shows that, chemically, it is a salt of calcium and the carbonate ion with the formula CaCO3, crystallizing in the calcite or aragonite crystal structure. The chemical purity of this product is usually evaluated according to the calcium carbonate percentage and the amount of impurities such as silica (SiO2), iron oxide (Fe2O3), aluminum oxide (Al2O3) and magnesium compounds. The higher the calcium carbonate percentage and the lower the impurities, the more suitable the product will be for more sensitive applications such as high-quality paint production, transparent masterbatch and coated paper.

In terms of physical properties, mineral calcium carbonate has a specific gravity of about 2.7 grams per cubic centimeter, a hardness of approximately 3 on the Mohs scale, and a milky-white to very bright white color. This material decomposes at high temperatures (from about 525 degrees Celsius and above), releasing carbon dioxide gas; thermal behavior that is highly important in polymer and papermaking processes.

The most important analysis and quality-control parameters for this product are:

- Calcium carbonate percentage (purity): the main quality indicator and the basis for calculating the product’s application value.
- Particle size distribution (mesh) and particle dimensions: determines the final application of the product.
- Whiteness and yellowness degree: very important in paint, paper and masterbatch.
- Moisture content: directly affects powder flowability and the mixing process.
- Oil absorption: determines resin and oil consumption in paint and adhesive formulations.
- Average particle size (D50 and D97): precise indicators of particle size distribution.
- Surface coating percentage (in coated types): affects compatibility with the polymer base.

Understanding these parameters helps you correctly evaluate the analysis provided by the manufacturer before purchase. For example, in applications where the surface appearance and transparency of the product matter, choosing products with high whiteness and a uniform particle distribution will yield a much more desirable result. In contrast, in the production of engineered stone and construction adhesives, high purity together with a coarser particle size distribution is the main formulation priority.

It should also be noted that a complete product analysis is not limited to chemical composition; thermal behavior, whiteness, oil absorption and particle dispersion in the polymer base are also part of the product’s technical specifications, whose applications you will become familiar with later in this guide.

Mesh Range 100 to 3500; Particle Size Distribution and Its Meaning

One of the most important specifications of calcium carbonate is its particle size distribution, expressed in “mesh”. The mesh number means the number of openings per square inch of sieve; therefore, the higher the mesh number, the smaller the particle size and the finer the powder. This product is produced across a very wide range, from 100 to 3500 mesh, and this breadth enables the mineral material to meet the needs of very different industries.

Different particle size distributions are generally divided into the following categories, each with its dominant application:

- Mesh 100 to 400: coarser particles, mainly used in the production of engineered stone, construction adhesives, carpets and building materials. In these industries, the product acts as an economical volume filler.
- Mesh 400 to 800: medium particles suitable for architectural paints, artificial leather, paper and some industrial adhesives.
- Mesh 800 to 1250: fine particles selected for PVC/UPVC profiles and pipes, masterbatch, cables and standard polymer formulations.
- Mesh 1250 to 2500: very fine particles for high-quality paints, coated paper and transparent masterbatches.
- Mesh 2500 to 3500: ultra-fine particles (close to the nano scale) used for advanced applications, delicate coatings and sensitive engineered products.

In addition to particle size, particle size distribution is also very important. A product with a uniform distribution disperses better in the polymer base and prevents the formation of weak points in the final product. The D50 and D97 indices in particle analysis are scientific criteria for evaluating this uniformity.

Another point is the difference between coated and uncoated products. In the coating process, the particle surface is covered with a thin organic layer to increase its compatibility with polymer bases. The coated product creates better melt flow in extrusion and injection processes and helps improve the mechanical properties and surface gloss of the final product.

Ultimately, the choice of suitable mesh should be made according to the process type, equipment, formulation and expected properties of the final product. In the following chapters, we fully examine the specific applications of each particle size range.

Application of Calcium Carbonate in PVC/UPVC Profiles and Pipes and Masterbatch

One of the largest markets for calcium carbonate is the PVC and UPVC profile and pipe industry. In these industries, calcium carbonate is added to formulations as an active and economical filler to reduce the finished product price while improving its mechanical and processing properties. In UPVC profiles used for windows, doors and other building materials, this mineral material is formulated alongside stabilizers and lubricants, playing an important role in increasing compressive strength, reducing shrinkage and improving the dimensional stability of the profile after it exits the extruder.

In the production of PVC and UPVC pipes, adding calcium carbonate increases the extrusion output speed, reduces energy consumption and improves the pipe’s mechanical behavior against pressure and impact. Particles with suitable sizing and a uniform distribution prevent stress concentration and weak points in the pipe wall; therefore, choosing the correct mesh is very important in these applications.

Masterbatch is another product that caot be imagined without calcium carbonate. In fact, calcium carbonate masterbatch is the most widely used type of masterbatch in the plastics industry, used as a filler carrier for direct and precise injection into plastic extrusion and injection processes. The advantages of using masterbatch over raw powder include easier transportation, prevention of material waste, improved mixing quality and prevention of dust emission in the workshop environment.

In masterbatch formulation, the choice of calcium carbonate type (coated or uncoated) and its particle size directly affects the quality of particle dispersion in the polymer and the final transparency of the product. Coated particles, due to their organic surface coating, are more compatible with the polymer base and significantly improve melt flow and product output during mixing. This property is especially valuable in the production of injection-molded parts with a glossy surface and profiles that require high gloss.

In addition, calcium carbonate acts as a viscosity and thickness regulating agent in these industries, enabling increased production-line speed without quality loss. The combination of all these advantages has made this mineral material an inseparable component of the plastics and profile industry in Iran and worldwide.

The Role of Calcium Carbonate in the Paint, Paper and Adhesive Industries

In the paint industry, calcium carbonate is widely used as a filler and extender pigment. Due to its white color, high whiteness and economical price, it is a suitable and smart replacement for part of expensive pigments such as titanium dioxide (TiO2), while as a filling agent it increases the dry film volume of the paint and improves its covering power. In architectural paints, industrial paints and powder coatings, calcium carbonate particles with controlled dimensions improve resistance to abrasion, washing and weathering.

In paint production, oil absorption and particle sizing are two key factors in determining the formulation. The finer the particles, the better the covering power and optical properties of the paint; however, this fineness requires more oil and resin and consequently a higher price. To become more familiar with the role of this mineral material in paint production and choosing the coated type for this application, you can read the Comprehensive Guide to Using Coated Calcium Carbonate in Paint Production.

The papermaking industry is another major consumer of calcium carbonate worldwide. This mineral material is used both as a filler in the paper mass and as a coating pigment on its surface. Adding calcium carbonate to paper pulp increases brightness, improves printability, raises paper-machine speed and reduces the consumption of expensive fibers. Paper coated with this material provides a smooth and even surface for color printing, which is highly valuable in the printing and packaging industry.

In the adhesive and bonding products industry, calcium carbonate is used as a mineral filler in formulations for polymer-based adhesives, wood adhesives, tile and carpet adhesives, and packaging adhesives. This material helps control viscosity, adjust density, increase the solids percentage and ultimately reduce the final product cost. In water-based adhesives, choosing the proper mesh plays an important role in suspension stability and preventing particle settling.

A common feature of the paint, paper and adhesive industries is that in all of them, the final product quality strongly depends on particle uniformity, whiteness and the purity of calcium carbonate. For this reason, supplying this mineral material from a reliable source with precise quality control guarantees the quality of your final products.

Application of Calcium Carbonate in Cables, Artificial Leather and Engineered Stone

In the cable industry, calcium carbonate is one of the main components of cable insulation and jacket formulations. This mineral material is used in PVC- and polyethylene-based polymer compounds as an active filler that reduces formulation costs while helping improve the mechanical properties of the insulation, increase thermal resistance and adjust the compound’s density. In cables used outdoors and in corrosive environments, coated calcium carbonate particles significantly increase cable durability and service life by improving dispersion in the polymer base.

Artificial leather is another product whose manufacture uses calcium carbonate. In the artificial leather production process, a fabric base layer is covered with a polymer coating (mainly PVC- or PU-based). Calcium carbonate acts as a mineral filler in this coating, helping control thickness, create texture and a uniform surface appearance, improve mechanical properties and reduce the finished product price. In this application, high whiteness and uniform particle distribution are very important for achieving the desired surface quality.

Engineered stone, or artificial quartz, is one of the most attractive applications of this mineral material. In engineered stone production, calcium carbonate is used alongside stone aggregates, resin and pigments as a filler and density-regulating agent. This material improves mechanical properties, reduces porosity, controls weight and increases the processability of the stone, enabling the production of large stone slabs with diverse pattes. In this application, coarser particle sizes (in the 100 to 400 mesh range) are usually used to reduce production costs while maintaining the stone structure.

Besides these applications, calcium carbonate is also used in many other engineered products such as polymer sheets, injection-molded parts, polymer foams and rubber compounds. The wide particle size range (from 100 to 3500 mesh) allows this material to appear in industrial formulations both as a simple volume filler and as an active filler with advanced properties. This flexibility is the main reason for this mineral material’s presence across today’s highly diverse industries.

Guide to Choosing the Suitable Mesh and Type of Calcium Carbonate

Choosing the suitable calcium carbonate for any application is a technical decision that should be made according to the process type, production-line equipment and expected properties of the final product. The first question at this stage is whether a “coated” or “uncoated” product is needed. In general, if your process involves direct mixing of powder with a polymer base (such as plastic extrusion and injection), the coated product is the more logical choice due to better surface compatibility, better melt flow and more uniform dispersion. But in applications such as engineered stone, adhesives and some architectural paints, an uncoated product with suitable particle sizing will be fully adequate.

The second factor is mesh selection. As a general rule, the smoother the surface, the higher the gloss, the greater the transparency and the higher the dimensional precision required in the final product, the higher the mesh (finer particles) should be. For example, in transparent masterbatches and high-quality paints, fine particles in the 1250 to 3500 mesh range perform better, while for PVC pipes and standard profiles, the 800 to 1250 mesh range is more common. For specialized guidance in this area, read the Guide to Choosing the Suitable Mesh of Coated Calcium Carbonate for Plastic Injection.

The third factor is the product’s analysis quality. Carefully reviewing the purity percentage, whiteness, moisture and oil absorption helps you assess the product’s suitability for your formulation. For example, in paint production, low oil absorption means lower resin consumption and a lower finished cost, while in adhesive production, viscosity behavior and particle dispersion may be the main priority.

The fourth factor is your production equipment and process. Mixer speed, extruder capacity, filter type and even the powder conveying system can affect the choice of particle sizing and product type. Very fine particles may cause flowability problems in some conveying systems, while coarse particles can cause equipment wear. Consulting the manufacturer’s technical team is very helpful at this stage.

Finally, before purchasing high volumes, it is recommended to test a sample of the product in your formulation. Examining laboratory results and comparing them with the declared specifications is the best way to ensure the correct choice. This professional approach prevents financial losses caused by selecting an unsuitable product.

Storage, Quality Control and Introduction to the Calcium Carbonate Product

After selecting and purchasing calcium carbonate, proper storage of this product is very important for maintaining its quality. This mineral material should be kept in a dry, enclosed environment away from humidity, because moisture absorption can cause powder caking, reduced flowability and consequently disruption in the mixing and production process. To prevent this problem, bags should be placed on pallets and direct contact with the floor and walls should be avoided. For complete instructions in this regard, read the Comprehensive Guide to Storage and Warehousing of Industrial Coated Calcium Carbonate.

In addition to physical storage conditions, incoming quality control is a key stage in your production line. Checking the product analysis, including purity percentage, particle size distribution, whiteness, moisture and oil absorption, along with packaging and labeling inspection, ensures that the received product exactly matches your order. Performing these controls periodically guarantees the quality consistency of your final product.

Another important storage consideration is preventing contamination of the product with foreign particles and impurities. Calcium carbonate should be kept away from strong chemicals, and when used, only the amount needed for each production shift should be taken out of storage so that a fresh, uncaked product always enters the production line. Observing basic warehousing principles easily prevents major production problems.

The product offered by the Amiran Kani Sang Project is selected and produced for polymer, paint, paper and engineered product applications. Its particle size range varies from 100 to 3500 mesh, and its main applications include PVC/UPVC profiles and pipes, masterbatch, cables, artificial leather, paint, paper, adhesives and engineered stone. This wide variety allows you to choose a product perfectly suited to your production line. To view full specifications and order this product, visit the Calcium Carbonate product page.

Ultimately, choosing an expert and committed supplier is the most important success factor in using this mineral material. The technical team at the Amiran Kani Sang Project, understanding the needs of different industries, is ready to provide specialized consultation for selecting the suitable mesh and product type for your project. With the right choice, you can both benefit from the technical advantages of this mineral material and significantly reduce your production costs.

The information presented in this article is based on the technical specifications of the calcium carbonate product on the Amiran Kani Sang Project website: https://ksamiran.ir/products/calcium-carbonate/