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What is the optimal filling volume for phase change ice boxes? Does fuller mean better?

2026-06-13

Many people believe that a fully filled phase change ice box delivers better cold storage performance, but this is not the case.

Phase change materials expand during freezing and solidifying. If overfilled with no room for expansion, the box is prone to bulging, shell cracking, deformation and liquid leakage after repeated freezing and thawing.

On the contrary, insufficient filling leaves excessive internal gaps, leading to inadequate cold storage capacity, shorter cold retention time and poor constant temperature stability. Formal manufacturers reserve reasonable expansion space based on scientific ratios. A proper filling level ensures sufficient cooling capacity while leaving safe room for expansion, balancing performance and service life. This is also a key detail to distinguish high-quality products from inferior ones.

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