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Birch plywood is graded on two separate characteristics. First, the face of the plywood is graded, and then the back face is graded separately. Below you will find a simplified version of these grades.
Face:
AA This is the highest face grade that is produced. Used for Architectural paneling, quality furniture, cabinetry, or any other application where the best appearance is needed. This grade may have limited availability is some species of wood.
A Most used face grade of plywood. Used when AA is not required but excellent appearance is still needed.
B Used when natural color and characteristics are desired without losing structural integrity of the panel
C Allows for unlimited color and increased natural characteristics. Usually panels are very economical.
D&E The lowest face grade of plywood. Allows increased size of natural character marks as well as larger repair spots in the veneer. Very rustic appearance.
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BACK:
1&2 These two grades are synonymous with each other, with grade 1 being the most restrictive. Both grades provide sound surfaces with any openings on the back face repaired. Worm holes 1/16" or smaller are allowed in these grades.
3&4 Both of these grades permit open defects. These can be, but not limited to, splits, bark pockets, and knot holes.
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