The methods used visual inspection of the surface quality glazed tiles. There should be no color, crack, Zhuanmian convex, Zhuanmian glazed colors in spots, and other phenomena; brick depth should not be back for 1 / 2 bricks thick Kepeng injury; brick the color should be consistent; blocks from the 1-meter Observation, a good glazed tiles should not be stripping the border areas, corrugated, missing glaze, brown eyes, positive Kepo, such as surface defects. Check the density of brick and water absorption. Method: Niezhu slabs of the iceberg will bring brick, metal percussion Zhuanmian of lightly, listen to the voice. Generally speaking, the voice of the crisp brick density, high strength, water absorption of small, brick of better quality; Instead, nausea mute the voices of small brick density, intensity, low water absorption larger blocks of poor quality. "Three of" device that is used in the method of inspection brick geometry whether the error allowed range. Any brand of glazed tiles, geometry there will be errors, as long as the error is different. Good glazed tiles on the scope of error of strict requirements, in general, the length and width of error of plus or minus should not exceed 0.8 mm; thickness of error, plus or minus should not exceed 0.3 mm. Check the time, should be random, that is, in different boxes, sampling inspection, the total number to about 10 percent, when not less than three. "4:1" Founder of brick and formation, we can use "over the" methods to check. Randomly selected four blocks, in a face-to-face stickers, take a look at whether there is a dark Alice. Then brick relative rotation 90 °, take a look at the surrounding still coincidence. If the brick telling paste close, the dark without Alice, revolving around after the basic coincidence, you can check that by the Founder of glazed tiles and the formation of relatively good.