Physical Properties

1. Color and Texture: Zhangqiu black stone features a deep gray-black hue with fine white or gray speckles on its surface. The texture is natural and unique, conveying a sense of stability and elegance.
2. Density and Hardness: High density, typically between 2.6-2.9 g/cm³, hardness up to 6-7 grades (Mohs scale), with excellent wear resistance.
3. Compressive Strength: The compressive strength typically ranges from 100 to 150 MPa, with some high-quality stones reaching up to 198 MPa, significantly exceeding industry standards.
4. Water Absorption and Weather Resistance: Low water absorption rate, typically below 0.2%, excellent impermeability; strong weather resistance, able to withstand weathering, corrosion, and discoloration, suitable for various climatic conditions.