+.09/-0.82 15 mm +.1/-0.9 ; 18 mm +.12/-0.98 ; 22 mm +.16/-1.08 ; 25 mm +1.8/-1.16 From the above we can assume that 6 mm material will arrive at thickness' between 6.04 mm and 5.35 mm. Face Veneer thickness -- For any three-ply construction, which applies to 3 and 4 mm material, each face veneer shall be not thinner than 1/8 of the total thickness of veneers assembled dry. Since the dry thicknesses of the boards are 3.6 and 4.6 respectively, we can assume that, for these thicknesses only, the face veneers will be as follows: 3.6 mm dry x 12.5% (1/8) = 0.45 mm 4.6 mm dry x 12.5% (1/8) = 0.575 mm Multi-Ply Construction-- This applies to boards thicker than 4.8 mm (3/16") Each face veneer shall be a minimum of 1.3 mm and not thicker than 3.8 mm. Each core veneer shall be no thicker than 4.8 mm See also Marine plywood References BOATBUILDING WITH PLYWOOD, by Glen L. Witt CHAPTER 5 - LUMBER 01088 Plywood