What is the problem that the corners of the tiles are tilted after two years of use ~! ! !

In ceramic jargon, this situation is called late deformation. The reason is that the expansion coefficient of ceramic tile blank and glaze does not match. Generally, the expansion coefficient of green body is large, resulting in downward bending pressure, while the expansion coefficient of glaze is small, resulting in upward warping tension. When the difference between the two is too large, it will bend downward or upward. However, the reaction time of this stress is long or short, which is related to the formula, manufacturing technology and firing time of soil and glaze. When buying ceramic tiles, don't pursue the straighter the better, especially the wall tiles and glazed floor tiles with high water absorption, which tend to bounce after soaking in water. Mature factories will bend the products slightly.