Materials
Corrugated Board Types (B, C, E, BC Flute) and Their Cost Impact
Differences between B, C, E and BC flute corrugated board; which flute fits which product in terms of strength, thickness and cost.
When choosing corrugated board, the most critical decision is the flute type. The flute determines both the box's strength and — often unnoticed — its cost. In this article we compare E, B, C and BC flutes by strength, thickness and price.
- Flute type changes the amount of material used; thicker/double-wall = more material = higher cost.
- E flute leads on print quality, C flute on stacking strength, BC double-wall on heavy/export cases.
- The right choice is the "most suitable flute" that ships the product undamaged — not the "cheapest flute".
How corrugated board is made
Corrugated board is produced by gluing a fluted (waved) paper layer between flat paper layers (liners). The height and frequency of the flute define the "flute type" and directly affect the box's mechanical behaviour.
Flute types and their differences
| Flute | Thickness (≈) | Standout property | Typical use |
|---|---|---|---|
| E | 1.5 mm | Smooth print surface | Retail / presentation box |
| B | 3 mm | Print + strength balance | E-commerce case |
| C | 4 mm | Stacking strength | Shipping case |
| BC | 7 mm | High strength (double) | Heavy product / export |
How flute type affects cost
Cost depends on the amount of paper used (grammage × number of layers). Double-wall (BC) contains two flutes + three liners, so it uses noticeably more material than single-wall.
Figures are indicative; the exact ratio depends on grammage and liner choice. To cost a box end to end, use how to calculate carton box cost.
Which flute for which product?
Light and medium-weight products, retail boxes needing high print quality, e-commerce shipments. Lower material cost.
Heavy products, long-term stacking, export and moisture-risk shipments. Higher strength, higher cost.
The cost of your flute choice shifts when paper prices move. To manage that risk, see raw material price volatility.
The right flute choice both prevents damaged shipments and avoids unnecessary material cost. When in doubt, pick the lowest safe flute for the product weight and handling conditions.
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