What Is a Flute?
The flute is the wavy layer of paper between the flat liners of corrugated board. Flute size affects the board’s thickness, cushioning, stacking strength, and how well it takes printing. The letters reflect the order in which the profiles were introduced, not their quality.
The Common Flutes
- A-flute: the thickest common profile, with good cushioning.
- B-flute: thinner, with good flat crush resistance and a smoother print surface.
- C-flute: between A and B, and a common choice for general shipping boxes.
- E-flute: thin, with a smooth surface for printing; used for mailers and retail packaging.
- F-flute: thinner still, for small retail and specialty packaging.
Combined Flutes
Double wall board combines two flutes, such as BC, for more strength. Triple wall adds a third for the heaviest uses.
Choosing
For general shipping, C-flute or BC double wall covers most needs. For fragile items, more cushioning helps. For printed retail packaging, a finer flute such as E gives a better surface.
Need Boxes?
Whether you want to buy used boxes, sell surplus boxes, or arrange recycling, send a free quote request and a partner supplier will follow up.