Third, we should pay attention to the quality of some of the technical indicators the purchase, especially the physical and mechanical properties, physical properties of a large number of purchase must be detected.

Stone-quality technical indicators refers to the physical and mechanical properties of stone, including water absorption, bulk density, dry compressive strength, flexural strength. Some researchers believe that the stone technology, under normal circumstances, a bulk density of stone small, relatively higher water absorption. Such a stone, in appearance relatively loose material, the nature of the defect is larger porosity of the material, the use of a variety of impurities and dirt easily inhaled. When the stone as a floor laying material should focus on its hardness and wear resistance index. So on, select a stone post, see if there is no test report, the best a qualified quality inspection departments do physical performance test. Of course, as a product of nature, stone radiation is inevitable, inseparable from building materials such as cement, glass, ceramics and others have radiation. It is important to see whether the excessive content, if the system is screwed under the national standard, it is a safe, environmentally friendly, can feel comfortable buying. When buying stone, depending on thickness should be uniform, the surface should be smooth and bright, the pattern should be uniform, distinctive patterns, color should be consistent and not have pit; and trimming the four corners neatly, each corresponding to a right angle to each other, at the same time to close the internal structure, no cracks.