Eutectics and insulation19 / 26

Where the ice sits points to its cause. Here is how much water one door opening can bring in, and what to check at the door edge, the base and the load.

The longest step is freezing the plates: GEBHARDT's table recommends 24 hours for every plate, and it runs overnight. The order of everything else decides how much of the morning is lost.

Find the heat-gain path in the measurements, then compare container design and plate load in a controlled trial.

Choose placement from the container model, load plan and product's sensitivity to freezing.

Ice and plates are not automatic substitutes. Assess product, packaging, drainage, hygiene and transport requirements together.

Both work by phase change. Two questions decide: does the container come back, and at what temperature must the product stay. Gel packs for one-way parcels, eutectic plates for returnable containers and frozen goods.

Contact zones can differ from general container readings. Document load marks, packaging and product measurements together.

When freezing, an air gap between plates and the freezer temperature decide the result; when transporting, cold air sinking decides where the plate goes. Read the numbers against the melting point.

A suspect plate leaves service and is not patched and returned. Below: the most liquid a plate can release, the records to keep and the food law behind the decision.

Do not generalise fluid composition across products or plates. Check the label and SDS, document possible contact and obtain a quality decision.

If a plate changes shape or is wet, isolate it from use. Record its ID, observations and potentially exposed load, then contact your supplier.

Follow model-specific maintenance instructions; justify replacement using ID, use, damage and performance records.

GEBHARDT's table lists 24 hours as the recommended freezing time for its eutectic plates, and it can run between 8 and 24 hours depending on the cooling technology. The freezing temperature must be at least 5 °C below the melting point.

Do not infer suitability from the freezer type. Validate using plate instructions, freezer records and the planned rack load.

When the outside of a container with a closed shell gets wet, the insulation layer stays dry. The risk starts when a crack or separation gives water a way in.

Secure partial loads and preserve airflow. Record the actual layout, measurement point and product instructions during a trial run.