9 mm ≈ 3/8″ (7 plies) 12 mm ≈ 1/2″ (9 plies) 18 mm ≈ 3/4″ (13 plies) – From [3] Ultimate guide to Baltic birch. The core of regular hardware store plywood. Pretty bad in comparison.
Results that may be inaccessible to you are currently showing.