First of all, judging from the price of the purification board, all products are worth every penny, and the price of high-quality products will naturally be higher. If the price is too low, you should consider carefully. After the price comparison, you should observe the purification board Quality. It should also be observed from the thickness of the substrate of the purification board and the thickness of the coating. The purification board is composed of a substrate and a colored peritoneum or coating. The standard product substrate thickness is 0.02~0.05mm, if the thickness is too high or too low , are inferior purification boards, and must not be purchased. The thickness of the film or coating is generally less than 0.15mm, which looks very thin, so you must judge according to the standard thickness when purchasing.
Secondly, it is necessary to judge from the appearance of the purification board and observe the leakage edge of the product. The crystals on the cut surface of the high-quality purification board are very fine, smooth and delicate to the touch, without any impurities, and the color is smooth and translucent. Rub it with your hands. There will be no fading and peeling phenomenon. And the inferior purification board has a dull color, feels rough to the touch, and has small impurity particles, which look dull.