"GB/T 45875-2025 Fine ceramics, Determination of the compactness of ceramic powders under natural sintering conditions" stipulates the determination method of the compactness of fine ceramic powders under natural sintering conditions. The standard provides a unified technical basis for the production, research and development and testing of fine ceramics, and helps to evaluate the densification performance of powders during natural sintering. It has important guiding significance for optimizing the ceramic preparation process and ensuring the mass Stability of products. It is suitable for scientific research and production practice in related materials fields.