The child fell in the corridor on the first floor and hit his head on the corner of the tile. The wound was deep, with 22 stitches. The floor tiles are uneven and sharp, which has potential safety haz

The child fell in the corridor on the first floor and hit his head on the corner of the tile. The wound was deep, with 22 stitches. The floor tiles are uneven and sharp, which has potential safety hazards. I'm looking for a property. Ceramic tiles are divided into five grades, first-class, second-class, third-class and off-grade. As the prices vary greatly, we need to compare them carefully. When buying, pay attention to whether the logo, specification and color number on the ceramic tile and the packaging box are consistent, and whether the product certificate, trademark and quality inspection label are clear. Products with dimensional error greater than 0.5 mm and flatness greater than 0. 1 mm will not increase the construction difficulty, and the effect after decoration will be poor. Whether the size meets the standard can be judged by visual inspection. Put the brick on the plane and see if its four sides are completely consistent with the plane, and at the same time see if the four corners of the tile are at right angles. Tiles shall be free from defects such as unevenness, bulging and warping, with the error of side length not exceeding 0.2-0.3mm and the error of thickness not exceeding 0.1mm.. (Detailed data should be checked with vernier caliper) Ceramic tiles have good hardness, strong toughness and are neither brittle nor rotten. Scrape each other with the edges and corners of the tiles to see whether the broken fragments are fine or loose, hard or brittle or soft, leaving scratches or loose powder. If the former is top grade, the latter is inferior. Good ceramic tile printing technology, clear and consistent patterns and patterns, exquisite technology, no obvious color leakage, dislocation, broken line or inconsistent depth. The color of ceramic tiles should be uniform, the surface smoothness and flatness should be better, the periphery should be regular and the pattern should be complete. Take out four or five pieces from a box to see if there are any defects such as color difference, deformation and lack of edges and corners. You can drop water on the back of the tile to see seepage velocity after the water is dispersed. Generally speaking, the slower the water absorption, the greater the density of tiles; On the contrary, the faster the water absorption, the rarer the density and the better the internal quality. Usually, cheap tiles will be covered with some uneven black spots when the tiles are not harmonious, especially the color contrast is deep and the color distribution is uneven. This is because these tiles are not cleaned after removing impurities and iron.