ZNSJ high strength wooden formwork, by using first class compete core veneer of fine pine, eucalyptus and hardwood etc, and each layers was well glued, then twice pressed through cold and hot pressing machine. There’ s no spaces in the middle of the board after sawed. The surface was smooth and well glued with waterproof Phenolic Glue.No warp, no distortion, no cracking, high strength, water resistance and so on, its turnover could be more than 10-15 time