There is the difference between grades of plywood and grades of veneer. Grades of plywood are made up of veneer grades which are used for covering. For example, plywood covered on the front side with grade B veneer and on the back side with BB veneer will have grade B/BB - the first indicates the highest grade.
Formation of Coated smooth plywood SyPly™ plywood grades
1st grade, 1/2 grade
View pictures of plywood by grade
Scheme of forming plywood grades from veneer grades *NSH - unpolished plywood surface
6.0, 9.0, 12.0, 12.5, 15.0, 18.0, 19.0, 20.0, 21.0, 24.0, 27.0, 30.0, 32.0, 35.0
DBR, BLK, LBR, GRN, YLW, RED, DBR with SyPly logo, colors on request with your logo
increased water resistance