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Five standard flute heights — A, C, B, E and F — decide whether a sheet of board becomes a stool or a scale model.
Corrugated board gets its strength from geometry: a wave of paper — the flute — glued between flat liners acts like a row of arches. Taller flutes mean thicker, more cushioning board; shorter flutes mean thinner, smoother board.
The standard heights: A flute measures about 4.7 mm, C about 3.6 mm, B about 2.5 mm, E about 1.6 mm and F about 0.8 mm. A and C are shipping-box stock — pick them for structure and protection. B resists sideways crush, suiting dividers and boxes that hold weight. E and F have fine, smooth faces that laminate flat and take paint well, which is why model-makers hoard them.
On narrow screens, swipe or scroll the plate sideways.
Walls multiply flutes. Single-wall — one flute between two liners — is the everyday grade that cuts with a knife. Double-wall stacks two flutes and triple-wall stacks three; that stacking is why moving-box board feels rigid enough to stand on while cereal-box board creases in the hand. Salvage double-wall from appliance boxes for anything load-bearing.
Board has one hard limit: it is paper. Never wet-sand or soak it — the liners delaminate. Seal cut edges with a thin coat of glue or a UV-resin layer cured for 1–5 minutes under a 365–405 nm lamp, keeping the layer under 3–5 mm, and sand the sealant instead of the board.
Pair the right flute with the right plastic and the two halves of the recycling bin cover a whole workshop: the codes guide sorts the plastics, and the planter build shows the full finishing sequence on a real piece.
Further reading