Box Volume and Wall Thickness: The Two Numbers Behind Gel Pack Weight
Ask three ice pack suppliers how much gel a 20-litre box needs and you will get three numbers, usually 600 g, 800 g and 1,000 g. All three can be right. The missing variable is wall thickness, and it does more to the melt curve than the gel weight does. A 20-litre box built from 20 mm expanded polys…
