1. Qilu grey granite has high structural density, high tensile strength, low water absorption, high surface hardness, good chemical resistance, strong durability, but poor flame retardancy.
2. Qilu gray granite has a granular structure of fine, medium, and sand, or a patchy structure. Its particles are uniform and delicate, with small gaps (porosity generally 0.3%~0.7%), low water absorption (water absorption generally 0.15%~0.46%), and good frost resistance.
3. Qilu limestone granite stone has high hardness. The Mohs hardness is about 6, and the hardness is about 2. 63g/cm3 to 2.75g/cm. Its bond strength is 100-300MPa. Among them, the capacity of fine sand granite is up to 300MPa. The bending strength is generally 10-30Mpa.