Hello, there are four kinds of building formwork materials in the market: pine, loose-pressed combination, eucalyptus and poplar. But pine is expensive, so many manufacturers don't do it. The turnover times of loose pressure combination can basically reach 8- 10, accounting for most of the market. Every manufacturer uses different glue. The surface of the loosely bonded board is phenolic glue and the inside is melamine glue. You are special.