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China Ground Calcium Carbonate (GCC) Suppliers - High-Quality Coating & Painting Factory Products
Product Description
Improving coating smoothness and enhances the visual appeal of high-demand surface coatings.
The addition of Useeen ground calcium carbonate can improve the surface smoothness of the coating, making it smoother and more uniform, and reducing defects such as bubbles and cracks on the coating surface. It enhances the overall appearance of the coating, making the product visually smoother and finer, and is suitable for high-demand surface coatings, such as those used in furniture and automotive surface treatments.
Improving UV resistance in coatings, preventing discoloration and ensuring long-lasting color stability for outdoor paints.
Ground calcium carbonate helps improve the UV resistance of painting, reducing the degradation caused by ultraviolet radiation. It can delay discoloration, yellowing, or cracking of the coating caused by UV light, enhancing the coating's UV resistance. This is especially suitable for outdoor coatings or paint products exposed to strong sunlight, ensuring the stability of their color and appearance after prolonged use.
Specification
ITEM |
UNIT |
INDEX |
CaCO3 |
% |
≥95 |
MgO |
% |
≤0.5 |
SiO2 |
% |
≤0.2 |
Average Particle Size |
μm |
≤45 |
Brightness |
% |
≥95 |
Oil absorption value |
gDOP/100g |
≤25.5 |
pH Value |
8-10 |
|
Moisture |
% |
≤0.4 |
325Mesh Residue |
% |
pass |
105°volatile matter |
W/% |
≤0.5 |
Heavy metal（as pb） |
W/% |
≤0.005 |
Useen Advantages
Price Advantage
Factory direct supply, with absolute price advantage, always providing customers with the most competitive and best prices.
Professional R&D Center
The professional R&D team can accurately understand customer needs, and conduct targeted optimization and flexible adjustments of various product parameters to meet customer needs.
OEM Service
Flexibly customize product specifications, packaging, etc. to avoid paying for unnecessary features and achieve cost optimization.
Top Quality
We have our own large-scale mining resources, select the industry's top raw materials, and strictly control quality from the source to ensure the excellent quality and stability of each product.
Environmentally Materials
The company has an independent supporting green mine raw material production base, forming an economic industrial chain integrating environmental friendly materials and nano material deep processing.
Complete After-Sales Service
Provide professional and timely after-sales service system, quickly respond to customer needs, ensure worry-free use, and win long-term trust and satisfaction from users.
Frequently Asked Questions
What is ground calcium carbonate and how is it used in coatings and paints?
Ground calcium carbonate (GCC) is a natural mineral filler derived from high-purity limestone or marble. In coatings and paints, it functions as a multifunctional extender that improves surface smoothness, enhances whiteness and opacity, controls rheology, and reduces formulation costs — all while maintaining or improving overall product performance.
How does ground calcium carbonate enhance UV resistance in outdoor paints?
GCC particles act as a physical barrier within the dried paint film, scattering and reflecting UV radiation before it can penetrate and degrade the binder. This delays the onset of chalking, yellowing, and cracking caused by prolonged sun exposure, making GCC-containing formulations especially valuable for exterior architectural and industrial coatings.
What particle size is recommended for smooth, high-gloss coating applications?
The optimal particle size depends on the gloss level and end use. For high-gloss finishes such as automotive topcoats and furniture lacquers, ultra-fine grades below 10 μm are preferred. The standard product with an average particle size of ≤45 μm is well suited for mid-sheen industrial and architectural coatings. Custom ultra-fine grades are available through OEM service upon request.
Is this ground calcium carbonate safe for use in interior architectural paints?
Yes. The product meets rigorous safety standards, with heavy metal content (as Pb) held at ≤0.005 W/% — well below industry thresholds — and a stable pH of 8–10. These characteristics make it fully suitable for interior wall paints, primers, and decorative coatings used in residential, commercial, and public building environments.
Can Useen customize product specifications and packaging for bulk or OEM orders?
Absolutely. Through Useen's OEM service, customers can specify particle size distribution, surface coating treatment, packaging format (small bags, jumbo bags, or bulk), and private labeling. The in-house R&D team works directly with buyers to fine-tune product parameters and ensure each batch matches their exact formulation requirements.
What quality controls are in place to ensure consistent product performance?
Useen operates its own large-scale mining base, enabling quality control from raw material extraction through to finished product. Every batch is tested against a full specification matrix — including CaCO₃ purity (≥95%), brightness (≥95%), moisture (≤0.4%), and oil absorption value (≤25.5 gDOP/100g) — ensuring consistent performance and reliable supply for coating and paint manufacturers worldwide.