1, the back of the anti-skid brick drops a few drops of tea juice or water, after a few minutes, depending on the extent of the water drop inhalation diffusion, no water absorption or low water absorption rate is good quality.

2. Knock on the anti-skid brick to listen to whether the sound is crisp, the more crisp the sound is, the higher the degree of porcelain, the higher the density and the better the hardness.

3. The surface of ordinary anti-skid brick is rough and has many pores. Dirt and dust in construction or use engineering are easy to penetrateintothe brick body, and pollutants are difficult to remove once they penetrate. Anti-skid brick becomes polished brick after polishing, high hardness, so very wear-resistant.

4. The color and chroma of anti-skid brick are clear and natural, indicating high degree of porcelain, unclear chroma and low degree of porcelain.

5. When choosing and purchasing, there is no pinhole on the surface to observe with the naked eye within one meter. If there is, it means that the surface of the anti-skid brick has not been waxed, which is easy to produce the accumulation of dirt.

6, warping degree observation: with the naked eye to see whether the side of the anti-skid brick is straight, if the warping situation will affect the future of the firm brick.