There is NOT minimum tolerance in our plywood controlled by calibrator machine, smoothly sanded by sophisticated sanders in China. We have stuffs specially used to inspect it before the delivery, none panel cannot be ignored from their eyes.  
All knows that moisture content is one of the most concerned factors by any buyers, which is decisive to the flatness of the finished products in various climate. MC of Hongda plywood is controlled around 8-10% by rolling drier. 
Look at the flatness of the panel, which is the symbol of Hongda plywood !! Very clear core structure with quality face/back veneer. That's it!
That's one corner of Hongda workshop where finished products just loaded after calibrated and sanded. Just ready to be packed and then delivered to the sea ports.