You spent thousands on high-quality LDPE bags to protect your precision machinery. You sealed them tight in Dongguan. Two months later, in Hamburg, your customer finds "rain" dripping from the ceiling and moisture pooled inside your sealed bags. This is the Dew Point Trap.
PE film is not an absolute wall; it is a semi-permeable membrane. When you seal a bag in humid air, you seal in water vapor. As temperatures drop during transit, that vapor turns into liquid water. Because your bag is "waterproof," the water has nowhere to go, causing corrosion and mold.
Expert Insight: Solving this requires moving beyond basic barrier thinking. True protection involves calculated desiccant loading based on the air volume trapped inside the bag.
[PROFESSIONAL AUDIT TOOL]: To help you calculate the exact risk and specify the correct barrier thickness, we have included the Theoretical Weight Audit Logic in our Industrial Sourcing Security Kit. Don't guess about moisture—calculate it.
If your supplier is just selling you "plastic bags" for sea freight, they are setting you up for a claim. Expert sourcing means auditing the climate transit path, not just the bag's dimensions.
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