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"Two Listening" is mainly used to check the compactness and water absorption of bricks. The method is: Hold the corner of the brick to lift the brick and tap the brick surface with metal to hear the sound. In general, sound crisp bricks have high density, high strength, low water absorption, and good quality bricks. On the contrary, the bricks with dull and dull sound have smaller density, higher strength and higher water absorption, and poor brick quality. .
The "three measures" is to check whether the geometric error of the brick is within the allowable range by using the ruler method. Any brand of glazed tile, geometry will have errors, but the error size is different. Good glazed tiles have strict requirements on the range of errors. In general, the length and width of the error, the positive and negative should not exceed 0.8mm; thickness error, the positive and negative should not exceed 0.3mm. When checking, random sampling should be carried out, that is, sampling in different boxes. The number is about 10% of the total, but not less than 3.
"Four ratios" are square and square for bricks, and we can use the "than" method to check. Feel free to take two bricks and stick them face to face to see if there is a bump. Then rotate the brick 90o to see if the perimeter still coincides. If the bricks face each other closely and without bulging, and the periphery is still basically coincident after rotation, it can be considered that the squareness and flatness of the inspected glazed tiles are relatively good. "Five investigations" The above inspections are some commonly used simple "earth methods". Regular inspection of glazed tiles needs to be carried out in the laboratory. Brand products sold by regular businesses should be accompanied by factory inspection reports. When buying, you should pay attention to and ask carefully, and carefully check whether the "certificate, object" is consistent.
Buy wall glazed tiles with tips
"A look" is a visual inspection of the surface quality of glazed tiles. Qualified glazed tiles should not have cracking, interlayer and glaze cracking phenomenon; the back of the brick should not have a scratch depth of 1/2 brick; the color of the bricks should be basically the same; observation from the brick 1 meter, good glazed tiles There should be no surface defects such as flaking, undulations, lack of glaze, brown eyes and blemishes.