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A 500 g pack at 470 g was inside the supplier’s default tolerance. How to write a net mass band, and why weight without gel strength is a loophole.
A 502 g pack “leaked” without losing a gram. How condensation forms inside a sealed shipper, why more gel makes it worse, and four fixes that work.
Batch CoA with the right test, food-contact declaration, seal and drop report at service temperature, transport classification. What each one proves.
Gel packs are 70 percent water with no recycling route in most markets. Waste categories, the drain that set solid, and the dry-ship alternative.
Gel $4.06, wetted sheets $3.72, reusable PCM $1.05 plus return freight. A line-by-line cost per shipment for a 48-hour 2-8 °C lane.
A 420 g/g SAP shed 8.4 percent of its water after 40 freeze-thaw cycles; a 280 g/g grade shed 1.9. What to specify instead of free-swell absorbency.
VIP boxes cut gel mass 30-40 percent, not 60. Why a punctured panel looks fine, how edges halve the R-value, and when the payback actually works.
1,200 packs of 500 g needs about 9 kW of refrigeration duty for a 10-hour pull. The kW sum, the stacking derate, and a failure blamed on SAP.
A calculator asked for 9.2 kg where the lane needed 5.4. The three pessimistic assumptions behind gel quantity tools and how to correct each one.
