Forty hours door to door, an ambient of 34 C at the origin apron, and a box of chilled salmon that must arrive under 4 C. The question is not "how many ice packs fit" but "how many kilos of frozen gel does this box actually need", and that number comes from a heat-load calculatio…
On the quotation, the reusable pack is 3.50 and the single-use pack is 0.35. Ten to one, so the reusable one must win over a season – except that the quotation is the only place where that ratio exists. Once return freight, washing, losses and the labour of sorting enter the calculation, the p…
A gel pack that feels firm on the bench can still slump into a corner after six hours in a box. The difference is rarely the SAP grade and almost always the dosage — how many grams of polymer went into each litre of water. Too little and the fill never builds a network; too much and the gel becomes …
