Why grading exists at all
The entire value of buying used boxes rests on trust. You are purchasing something someone else already used, often sight unseen, sometimes by the truckload. Grading is the system that lets you do that with confidence.
A grade is a promise about condition and performance. If our grades are consistent, you can plan a pack line or a storage layout around them without inspecting a single box yourself.
Signal one: the liner
The liner is the flat facing on the inside and outside of the board. We check it for tears, punctures and delamination — the last being when the liner starts separating from the fluted medium underneath.
A sound liner means the box can still carry and protect. A delaminating liner is a warning that the board has been stressed or wetted, even if it looks acceptable at a glance.
Signal two: corners and squareness
Corners are where stacking strength lives. A box that has gone out of square, or whose corners are soft or rounded, will not stack reliably no matter how good the panels look.
Graders check squareness by feel and by eye, fast. It is the single best predictor of whether a box will hold a load in a real warehouse rack.
Signals three and four: crush and moisture
Moisture is the sneaky one. Corrugated loses strength when it has been damp, and it does not always show. A box can look clean and still have gone soft from a humid warehouse, which is why the feel test matters as much as the look.
- Crush: dents and compression along edges and panels that reduce load capacity.
- Moisture history: softness, water rings or a limp feel that signals lost strength.
“Moisture is the damage you cannot always see. We are trained to feel for it.”
Turning signals into a grade
The grades only work if they hold steady over time. A Grade B has to mean the same thing every month, from every grader. That discipline is the product — the boxes are just the medium.
- Grade A: clean liner, square corners, no meaningful crush, dry — like-new.
- Grade B: minor cosmetic wear, structurally sound, one or two prior uses — the workhorse.
- Grade C: visible wear, best for light or single-cycle use, or reconditioning feedstock.
How to use grades when you buy
Match the grade to how critical your load is. Customer-facing or heavy loads want Grade A. Internal handling and storage are perfect for Grade B. Light, non-critical or single-trip jobs are where Grade C shines and saves the most.
When you request a quote, tell us the job as well as the grade you think you want — sometimes a lower grade does the work for less, and occasionally you need to step up. We would rather get you the right box than the expensive one.