E5-SP Royal Mail Small Parcel Cardboard Box
The E5-SP cardboard boxes are seriously strong with a Cardboard Box Compression Test Strength (BCT) of 1540N.
These cardboard boxes are over 20% stronger than the Industry Standard in the material strength Box Compression Test. In comparison, a standard single wall box will have a material strength of between 1190 and 1270N.
(The Box Compression Test shows the force required to crush a box with a size of 400x300x200mm.)