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Ice packs stacked into a tight block freeze late in the middle. Layering them on a rack that keeps an air gap between packs works fine.

Gel packs go above the product, with an insulating layer between pack and goods, and are held so they cannot move in the box. The layout is checked with a trial run for that box, the outside temperature and the transit time.

A box can fit the aisle and still not open. The space needed follows from the door width measured from the hinge axis and from the opening angle.

A gel pack laid flat in a single layer freezes through in 24-48 hours. A pack that is hard outside can still be soft in the middle; readiness is judged at the centre.

The gel pack temperature class, freezing time, the cooling capacity of a 500 g pack and how many packs a warm load needs.

GEBHARDT recommends 24 hours for its eutectic plates; depending on the cooling technology it ranges from 8 to 24 hours. The freezer must run at least 5 °C below the melting point.

Match drawings, load and interfaces with the integrator, then trial a sample through a full cycle.

An empty box is light but bulky. Sunlight, the pressure of one narrow contact point and look-alike models are the three ways stock gets damaged; each one comes with a figure and a check.

The inner box should not shift, and supports should not crush its walls or lid. Validate the pack with the carrier's applicable test conditions.

A set goes out in the morning, comes back at night and has to freeze. The set count follows from the length of that cycle, the dispatch interval and the routes leaving together.

The label goes on a flat, dry surface away from edges. Polystyrene is rough and cold, so adhesion is tested on the real box.

Keeping boxes within the pallet footprint is only the start. Bottom-layer pressure, alignment, interlayers and stretch tension need joint control.

Do not assume fixed hold times for full or empty loads; compare product, mass, initial state, and matched route measurements.

Tape holds a seated lid closed; it does not fix a gap or a crushed edge. Dry-fit the lid first, then trial the tape on a real shipment.

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.