90 ECT vs 112 ECT: side-by-side numbers
112 ECT board crushes at 112 lb per inch of edge against 90 for 90 ECT, so in AAC triple wall a 112 ECT box is estimated 24% stronger in compression at any size. Whether that is worth it depends on load, stack height and storage time.
Estimated compression at 10 sizes
| Inside, in | 90 ECT AAC | 112 ECT AAC | Difference |
|---|---|---|---|
| 8 × 6 × 4 | 2,038 | 2,536 | +498 lbf |
| 10 × 8 × 6 | 2,310 | 2,875 | +565 lbf |
| 12 × 12 × 12 | 2,668 | 3,320 | +652 lbf |
| 14 × 10 × 8 | 2,668 | 3,320 | +652 lbf |
| 16 × 12 × 10 | 2,882 | 3,586 | +704 lbf |
| 18 × 12 × 12 | 2,983 | 3,712 | +729 lbf |
| 18 × 18 × 18 | 3,268 | 4,066 | +799 lbf |
| 20 × 16 × 14 | 3,268 | 4,066 | +799 lbf |
| 24 × 18 × 18 | 3,529 | 4,392 | +863 lbf |
| 24 × 24 × 24 | 3,773 | 4,695 | +922 lbf |
Boxes high at 30 lb per box
| Inside, in | 90 ECT | 112 ECT |
|---|---|---|
| 10 × 8 × 6 | 47 | 58 |
| 16 × 12 × 10 | 58 | 72 |
| 24 × 18 × 18 | 71 | 88 |
Column stacked for 30 days with Packgent's default 40% storage loss (an assumption): ⌊BCT × 0.6 ÷ 30⌋ + 1.
Choosing between them
Pick the lower grade when the stack is short, the load light or the box is used once. Move up when boxes sit in storage for weeks, see humid warehouses, are interlocked or overhang the pallet, because each of those cuts usable strength. The stacking calculator shows which grade your conditions need.
Sources
- Foster, G. (1997). "Boxes, Corrugated." In Brody & Marsh (eds.), The Wiley Encyclopedia of Packaging Technology, 2nd ed. Wiley. ISBN 0-471-06397-5 (table reproduced in Wikipedia, "Corrugated fiberboard")
- Packaging Corporation of America: Profiles with a purpose
- McKee, Gander & Wachuta (1963), Paperboard Packaging 48(8)
Last reviewed . See all sources and how Packgent computes.