1, look at the appearance
The appearance mainly depends on the consistency of glaze color, smoothness, luster and smoothness of the surface, sintering degree of the back, brand and trademark, etc.
2. Listen to the sound
Methods By listening to the tapping sound, the clearer the sound when the glazed tile is tapped, the better. What is the national standard flexural strength? 1020N .
Step 3 look at the water absorption rate
Glazed tiles absorb as little water as possible. The more water is absorbed, the worse the frost resistance of tiles. The test method is to compare the weight difference between dry bricks and foamed bricks, which is moisture. Does the national standard stipulate water absorption? 12.0%。 Or you can drop a few drops of water on the glazed tile for an hour. If the drip is still there, it means the quality is good, otherwise it is not good.
4. Look at the glaze crack
Glaze cracking of glazed tiles is a very common phenomenon. If there are cracks in glazed tiles, the glaze layer will peel off or fall off in winter because of the low temperature. We can detect whether there are spider silk cracks on the surface of glazed tiles.