This part of GB/T 9846 specifies the dimensional tolerances of the length, width and thickness of planar ordinary plywood, as well as the tolerance requirements for edge straightness and perpendicularity. This standard applies to whole sheets of plywood and does not apply to plywood assembled by miter, finger or other end-joints.
GB/T 9846.2-2004 Plywood-Part 2:Tolerances on dimensions has been changed from GB/T 9846.3-1988 Plywood--Specification for dimensions and tolerances of plywood for general use.