1, look at the process of aluminum gusset plate: the surface of inferior gusset plate looks uneven and there will be particles; The quality board looks flat and the panel is soft. A good aluminum gusset plate only has cracks on the paint surface, and no large pieces of paint will fall off; In addition, a good aluminum gusset plate has paint on both sides, because the back is often worse and wetter, and the aluminum gusset plate with paint on the back has a longer service life.

2, smell: burn a corner of the inferior board with a lighter, it will burn in 30 seconds, and there is a pungent smell of burning plastic, while the roll-coated oil-proof aluminum gusset plate will not have a pungent smell even if it burns yellow, so it can also distinguish its quality.

3. Touch the coated board: the temperature of the coated board is the temperature of plastic, so it is higher, so it should be warmer. The temperature of roller coating is the temperature of metal, so it should be cooler.

4. Tap the aluminum gusset plate to listen to the sound: Hold the corner of the panel with your hand and tap the center of the panel to make the sound of the film-coated panel dull and the sound of the roll-coated panel crisp.

5. Look at the bottom glue of the aluminum gusset plate: The bottom glue is to protect the water vapor generated by the aluminum gusset plate in the normal life of the kitchen or bathroom from penetrating to the bottom of the gusset plate, so that the bottom of the ceiling gusset plate can be in contact with water and air for a long time. After a long time, the aluminum gusset plate will rust and mold from the bottom until it loses its function. The primer of high-quality aluminum gusset plate of integrated ceiling shall be sprayed evenly on the bottom of the plate, and the specific uniformity shall be subject to whether there are silver-gray dots when the bottom of the plate is carefully observed with eyes.