Heavy-duty corrugated boxes commonly use A, B and C flutes and their combinations. The flute type determines compression strength, surface flatness and cushioning – choosing the right flute is the first step in heavy-duty packaging design.
1. Common Flute Types at a Glance
| Flute | Height | Best For |
|---|---|---|
| A flute | 5 mm | Cushioning – fragile goods |
| B flute | 3 mm | Flat surface – printing |
| C flute | 4 mm | All-round performance – most common |
| BE flute | B + E combo | High strength with good flatness |
| BC flute | B + C combo | Most common for heavy-duty boxes |
| AAA flute | Triple A | Ultra-heavy duty, best cushioning |
2. How to Choose
Double-wall heavy-duty boxes most often use BC flute, balancing strength and flatness. Choose A or AAA flute for fragile goods that need extra cushioning; choose B or BE flute when fine surface printing matters.
GuardP (ISO 9001 certified, Guangzhou, China) recommends the right flute combination based on cargo weight and shipping conditions. Contact us for a custom heavy-duty packaging proposal.