“Flute” is the wavy layer in the middle of a corrugated sheet — the part that gives both strength and cushioning. The size of the wave determines how well the box resists stacking, how well it protects the part, and how smooth the surface is for printing. Pick the wrong flute, and you either pay too much or the part gets damaged in transit.

Here are the flute types most commonly used for industrial packaging, and when each one makes sense.

B-flute

A tight, relatively low wave. Strong against surface pressure and good for printing. Suits boxes that need a flat surface, medium-sized parts, and stacking that isn’t too high.

C-flute

A slightly taller wave than B. Better cushioning and higher stacking strength — the all-rounder that often ends up as the default for a master box.

E-flute

The tightest and thinnest wave. The smoothest surface for detailed printing, and it makes for a slimmer box. Suits small parts, presentation packaging, or when space is a consideration.

BC-flute (double wall)

A combination of two layers (B and C). The strongest for heavy loads and high stacking. Used when protection and strength matter more than thinness.

How to choose for automotive parts

Three questions usually decide it:

  1. How heavy is the load and how high is the stack? The heavier/taller it is, the more it points toward C or BC.
  2. Do you need detailed printing (part codes, markings)? A smooth surface points toward B or E.
  3. Is warehouse and truck space tight? A slimmer flute (E) saves volume.

There’s no single “best” flute — the right one is the one that fits the part, the load, and the way you store and ship it.

At JMP, the flute (B, C, E, and the BC combination) is set to match your part’s specification, not an off-the-shelf catalog — made from zero starting at 500 pcs. If you’re not sure which flute fits, send a photo or drawing of the part and a rough idea of how it’ll be stacked; we’ll help recommend one.

See also: custom corrugated carton boxes · Flex-Stock (VMI) program.

Source: PT Jaya Mandiri Packaging (JMP) — carton box & polybag manufacturer for the automotive industry since 1990. jayamandiripackaging.com