Second, test weight: 800 * 800 tiles are packed in three pieces. Polished brick weighs about 45KG, full glaze weighs about 50KG, and microcrystalline stone weighs about 60KG. The fluctuation of the upper and lower weights will not be great, depending on which standard the brick meets. Below this standard, it may be unqualified products.
Third, unpacking: open any box and take one of them to observe the thickness of the tile. No matter what kind of floor tile, the surface of high-quality products is flat, the glaze thickness of glazed tiles is between 5 and 8 mm, and whether the manufacturer's name or trademark is printed on the side or back of the tile, whether it is consistent with the brand purchased by itself, and if it is inconsistent, it is defective. The back texture of qualified tiles is clear and orderly, and polished without burr.
4. Precise measurement: After disassembling the three tiles, lay them flat on the ground, and carefully measure the dimensions of the corners of the three tiles with a tape measure. The error of the corner size of qualified tiles is very small, and there is no difference.
Fifth, close observation: the same batch of tiles have uniform color, no chromatic aberration, and the texture direction is the same, but some tiles pressed by natural stone have grains that are not in the same direction. This is a pure natural design and has nothing to do with chromatic aberration. If the edge of the tile is slightly convex, and the size error is within 2mm, it belongs to "first-class" tile.