"A look" is a visual method. It is a visual inspection of the surface quality of the glaze. Qualified glazed tiles should not have cracks, interlayers and glaze cracking; bricks should not have a depth of 1/2 block of bumps on the back; the color of the bricks should be basically the same; observations at 1 meter away from the brick, good glazed tiles There should be no surface defects such as edge stripping, corrugation, lack of glaze, brown eyes, and frontal breakage.
"Two Listening" is mainly used to detect the density 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, the crisp sound has high density, high strength, low water absorption, and good brick quality; on the contrary, the sound-muffled brick has lower density, lower strength, higher water absorption, and poor brick quality.
The "three quantity" method uses a ruler method to check whether the brick assembly size error is within the allowable range. Any brand of glazed tiles, the collection size 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, the thickness of the 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", for square and square bricks, we can use the "ratio" 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 bricks by 90° to see if the perimeter still coincides. If the bricks are close together and there is no bulging, the surrounding area after the rotation is still basically coincident, and it can be considered that the squareness and flatness of the inspected glazed tiles are better.
"Five investigations", the above inspections are some of the commonly used simple "land methods", the formal inspection of glazed tiles need 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.
Having mastered the above methods, I believe that you can certainly buy qualified glazed tile materials.
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