Single face corrugated board consists of one ply of fluted paper, onto
which paper or cardboard is glued. Single wall (double face) corrugated board consists of one ply of fluted
paper which is glued between two plies of paper or cardboard. Flute sizes include A, B, C, E, and F or micro flute. Flute size refers to the number of flutes per lineal meter,
although the actual flute dimensions for different corrugators manufacturers
may vary slightly. The most common flute size in
corrugated boxes is "C" flute.
Flute C has 128+-10 flutes per lineal meter with a Flute thickness of 4.0mm.