What we have written on the cold chain61 / 154

Do not treat density as a quality score; compare net weight, dimensions, tolerances and samples for the same model.

Where meltwater matters, do not treat an accessory tub and integrated drainage as equivalent. Confirm the model and internal configuration.

Five steps, each with its limit: checking the box, bringing the product to temperature, working out how much coolant the load needs, placing it, and recording the closure.

Choose by the actual handling path: check floor, thresholds, forklift access and how the load must move at the final handoff.

An intact EPS body takes up almost no water; leaks come through poorly fused beads, the lid line, corners and the base. Test the box with water while it is empty on receipt.

EPS and EPP look alike from outside but behave differently under crushing and impact. Density, the permanent deformation limit and measured thermal conductivity are below.

Compare active, passive and combined setups by product condition, tested route, load fit, preparation capacity, returns and same-period utilisation cost.

Compare delivery, opening, handling and empty-return flow, not just total litres. Test with the actual load before choosing.

Arrange the rack around actual retrieval and return movements, not a presumed ideal height. Verify changes through observation and incident records.

Daily dispatch count is not enough. Measure return, washing, drying and time to ready status from box IDs.

Plate temperature and surface can vary by model. Plan the task using manufacturer instructions, suitable protective equipment and a clear handling route.

The box is only one part of the decision. Confirm carrier acceptance, packaging, delivery records and a plan for the empty return.