Density helps compare offers; it does not guarantee insulation or strength. Verify the box model first.
What does density tell you?. Ask which sample and test method produced the figure. Without a method, do not compare values.
The quotation form. Collect model, dimensions, weight, wall, lid and tolerances in one form. Volume alone shows no equivalence.
Accepting a batch. Keep the sample. Measure batch dimensions and weight the same way; check the supplier specification.
Compare a specification validated for the cargo and route, rather than choosing the highest density.
