Baltic Birch Grades Explained: What B/BB, BB/BB, and BB/CP Really Mean Baltic birch plywood has earned a reputation for its strength, consistency, and aesthetic appeal, making it a preferred material among woodworkers, cabinetmakers, and CNC professionals. However, one area that often causes confusion is the system of Baltic birch grades, which determines the visual and structural quality of the plywood faces and core. Visit:: https://sites.google.com/view/pgwoodimports3/home