32 ECT is a common single-wall shipping-box grade; 44 ECT provides a higher edge-crush rating for loads or handling conditions that need more stacking strength. The number alone does not determine whether a box fits your shipment: consider contents, stacking, carrier handling and the maker's box certificate. For dimensional weight and carton fit, see our box-sizing guide.
Choose the box grade around the shipment’s real load and stacking conditions. A stronger board can help when cartons are stacked or contents are heavy, but excess material can add weight and cost.
Compare the grades
| 32 ECT | 44 ECT | |
|---|---|---|
| Typical use | Common single-wall parcel boxes | Heavier loads or more demanding stacking needs |
| Tradeoff | Lower material weight and often lower carton cost | Higher board strength with possible added weight and cost |
| Verify | Box maker’s certificate and carton dimensions | Same, plus whether the shipment actually needs the stronger grade |
Fibre Box Association references the edge crush test as a corrugated board strength measure. A certificate’s box construction, size and test rating matter together; do not infer stacking capability from the ECT number alone.
Make a shipping test
Pack the product with the intended void fill, weigh the complete parcel and check how cartons are stored or stacked before dispatch. Keep the box manufacturer’s certificate for the exact carton. If the carton is too large, compare the postage effect in our dimensional-weight guide; if custom printing is the goal, compare branded boxes with stock boxes and inserts.
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Common questions
Is 44 ECT always better than 32 ECT?
No. It can add strength and cost, but the right carton depends on product weight, stacking, transit and the box maker's rating.
What does ECT measure?
Edge Crush Test measures the force needed to crush a short sample of corrugated board edgewise; it is used to classify stacking strength.
Where can I verify a box's ECT rating?
Check the box maker's certificate or printed box markings and keep the specification with the packaging record.