The main point is to see whether there are black spots, bubbles, pinholes, cracks, scratches, spots, missing edges, glass bricks for lack of angle to pay attention to whether there is leakage, leakage, grinding and other defects, whether deformation. Look at the tile water absorption rate, with a drop in the back of the brick, the smaller the diffusion area, the longer the suction dry time, the lower the water absorption rate, the better the quality; View the bottom embryo trademark mark, the normal factory produces the product on the embryo has the clear product trademark mark, if does not have or the special vague, the suggestion chooses carefully!
The weight of the tiles, try to feel the tile, the same specification products, good quality, high density brick feel is relatively heavy, on the contrary, the quality of the product feel lighter.
By tapping the tiles, by listening to sound to identify the quality of the tile.
Open box inspection, see if there is no damage, will be different boxes of products each smoked one, after the tile to see a colorless difference, size has no size.