... pressurized,sawdust foot pier,the surface smooth, waterproof good (soaked for 48 hours without cracking, sun and wind do not crack ... internal bonding strength of up to 1.07mpa, the vertical grip for the screw strength 1590N, flat behavior 1660N is the production ... , grasps the screws force vertical for 1590 N, parallel for 1660 N which is the ideal material for fumigation-free wood tray holder ...