right index finger and tap the tiles, such as voice clear and sweet for the top grade, such as sound dull and sluggish muddy beneath contempt. 4, drop test: water drops can be in the back of the tile, look at the speed of infiltration of water dispersed in general, water more slowly, indicating that the tile density is higher; on the contrary, water more quickly, explain density sparse, the quality of the former is better. 5, hand detection. The two bricks will be impacted

by fingers, and they will hit each other. The sound is loud and clear, and the sound is low and stuffy. There must be inherent quality defects. 6, color discrimination: because a large number of tiles to buy, if there are obvious color difference between a plurality of packaging, decoration effect is affected, to contrast all the packaging product sample, observe the color changes, the color can not use. 7, foot measurement: the higher the accuracy of the side length of

tiles, the better the effect after paving, it is not only easy to buy high-quality ceramic tiles, but also saves hours and accessories. Measure the size of the periphery of each tile has no difference, the size of the error is greater than 0.5 mm, roughness greater than 0.1 mm, will not only increase the difficulty of construction, at the same time after the decoration effect is poor, it can not be used for engineering. The judgment on the basis of the 1 floor, from the box to

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