smell
The normal board smells close to the nostrils and has a faint bamboo and wood fragrance. It smells of bamboo and resin when ignited. Inferior ones can smell the smell of PVC.
colour
Good bamboo and wood fibers are generally beige, and there are no black particles in the incision. If the color is wrong, it is black with particles, and the material may be wrong.
weight
Weigh the bamboo fiber board by hand. If it is too heavy, there may be more calcium powder. If it is light, it will cause serious foaming.
certificate
Ask the manufacturer whether there are product-related certificates, product quality inspection certificates, patent certificates and so on.