Box strength guide
32 ECT vs 200 lb Test: what the rating means
ECT and Mullen test ratings measure different forms of box strength. ECT measures edge crush resistance and is commonly used for stacking and compression strength. Mullen or burst test measures resistance to rupture or puncture.
For many ecommerce and warehouse shipments, ECT is the more useful buying spec. For sharp, heavy, or high-abuse shipments, compare the product weight, handling risk, and material protection before choosing the box.
Use 32 ECT when
- The shipment is a standard parcel.
- The product is light to medium weight.
- The item is not sharp, dense, or unusually fragile.
- You want a cost-effective single-wall box.
Choose stronger packaging when
- The product is heavy, dense, or fragile.
- Boxes will be stacked high or palletized.
- The shipment faces rough handling or freight transfer.
- The item needs more puncture resistance.
Product routing
Start with the correct box size, then choose the strength rating. A stronger box that is too large can still raise cost and increase product movement inside the package.