Quality Assurance at Dong Nhan Stone
Our CaCO3 powder meets the highest industry standards, guaranteed by rigorous testing and quality control at every stage of production.
At Dong Nhan Stone, quality is not an afterthought. It is built into every step of our production process, from raw material selection at the quarry to final packaging and dispatch.
Raw Material Sourcing
We own and operate our white marble quarry, which gives us full control over raw material quality. Our quarry features high-purity white marble with whiteness levels exceeding 98% and brightness above 96%, minimizing contamination from iron ore and other impurities.
Milling & Processing
Our two production factories use hydraulic and roller milling technology for precise particle size control. Each batch is milled to specification and checked for particle size distribution (D50/D97), whiteness, brightness, and moisture content.
Testing & Certification
All finished products undergo third-party laboratory testing before shipment. We provide full certificates of analysis (COA) and can accommodate client-specified testing requirements.
Our quality management system is continuously improved based on client feedback and the latest industry standards. We are committed to zero-compromise quality in every order.
