Shipping chilled, frozen or otherwise temperature-sensitive goods internationally involves more than booking a refrigerated container. The condition of the cargo before loading, the required temperature, packaging, airflow, documentation and arrangements at either end of the journey can all affect how smoothly the shipment moves.
Reefer containers provide temperature-controlled conditions throughout sea transport and are commonly used for food, fresh produce, seafood, frozen products and other sensitive cargo. However, businesses still need to prepare their goods correctly before the container is loaded.
Here are some of the main points to consider when planning a reefer shipment.
Confirm the Requirements of Your Cargo First
Different products need different transport conditions, so the first step is to establish exactly what your cargo requires.
Before arranging the shipment, you should know:
- The type of goods being transported
- Required carriage temperature
- Whether the cargo is chilled or frozen
- Any ventilation requirements
- Humidity requirements where applicable
- Total weight and volume
- Packaging type
- Collection and delivery locations
- Required shipping dates
- Any product-specific documentation or certificates
These details help the freight forwarder check equipment availability and determine how the shipment should be handled.
For international shipments, it is also important to distinguish between the temperature setting of the container and the actual temperature of the product when it is loaded.
Make Sure Goods Are at the Correct Temperature Before Loading
One of the most important points when preparing refrigerated cargo is pre-cooling.
A reefer container is primarily designed to maintain the required carriage temperature, rather than rapidly cool warm products after they have been loaded. Loading cargo that has not reached the required temperature can place additional demand on the refrigeration system and make it harder to maintain consistent conditions throughout the load.
For frozen goods, this usually means the cargo should already be frozen to its required transport temperature.
Chilled produce should also reach the agreed carriage temperature before loading where the product and handling process require it.
The exact requirements depend on the commodity, so these should be agreed before the container is booked.
Pack Reefer Cargo With Airflow in Mind
Correct loading is particularly important in a refrigerated container.
Reefer containers circulate conditioned air through channels in the floor before it moves through and around the cargo. Blocking that airflow can create areas where temperatures become less consistent.
Cargo should therefore be packed and loaded in a way that allows the refrigeration system to work as intended. Carrier guidance also warns against loading above the container’s marked load line and stresses the importance of preventing gaps or obstructions that interfere with airflow.
Packaging also matters.
Boxes, pallets and wrapping should be suitable for both the product and the required airflow. Some chilled produce may require ventilated packaging, while frozen cargo may be packed differently because fresh-air exchange is generally not required in the same way.
Simply setting the container to the correct temperature does not compensate for poor loading.
Get Temperature, Ventilation and Humidity Settings Right
Temperature is only one part of reefer shipping.
Depending on the commodity, the booking may also need to specify:
- Fresh-air ventilation
- Humidity requirements
- Air circulation
- Controlled-atmosphere requirements
- Monitoring arrangements
Fresh fruit and vegetables, for example, can continue to respire after harvesting. This can affect heat and gases within the container, which is why ventilation requirements need to be considered for some produce.
Frozen cargo has different requirements and may normally travel with fresh-air ventilation closed.
The correct settings should always be based on the commodity being transported rather than applying one standard setup to every refrigerated shipment.
Think About the Whole Cold Chain
The sea journey is only one part of an international reefer shipment.
A refrigerated container may move between:
Collection point → road transport → port terminal → vessel → destination terminal → customs release → final delivery
Temperature-sensitive goods therefore need suitable arrangements throughout the journey.
Reefer containers require an external electricity supply. Depending on the stage of transport, that may come from the terminal, vessel or a generator set used during inland movement.
When planning door-to-door refrigerated freight, it is important to confirm where the container will receive power and what arrangements are required during collection and final delivery.
This is one reason it can be useful to work with a freight forwarder that can coordinate the wider shipment rather than treating the ocean leg in isolation.
Check Customs and Product Documentation Before Shipping
Temperature control does not remove the need to meet normal import and export requirements.
Commercial invoices, packing lists and customs information need to be correct, while some food, plant, animal or pharmaceutical products can require additional certificates, licences or border procedures.
UK government guidance confirms that international food shipments must comply with applicable rules for food safety, packaging and labelling, while individual product categories may be subject to additional controls.
These requirements should be checked before the cargo leaves its origin country.
Delays involving temperature-sensitive goods can be more serious than delays to ordinary dry cargo, particularly where shelf life is limited or refrigerated storage is required while the goods wait for clearance.
Consider How the Shipment Will Be Monitored
Modern reefer equipment can record information such as supply and return-air temperatures, while additional cargo probes and remote monitoring services may be available depending on the equipment and carrier.
It is worth agreeing what level of monitoring the shipment requires before booking.
Short changes in recorded temperature do not necessarily mean the cargo itself has experienced the same change. Reefer units can go through defrost cycles and temporary power-off periods during handling, while sensors may measure air temperature rather than the internal temperature of the product.
For particularly sensitive cargo, discuss the required monitoring and reporting arrangements with your freight forwarder in advance.
What Information Should You Give Your Freight Forwarder?
Providing accurate information at the enquiry stage makes it much easier to plan a reefer shipment correctly.
Ideally, send:
- Cargo description
- Commodity type
- Number of pallets or packages
- Weight and dimensions
- Required carriage temperature
- Ventilation or humidity requirements
- Collection address
- Destination
- Preferred shipping date
- Details of any required certificates
- Final delivery requirements
If you are unsure about container size or transport arrangements, provide as much information as possible and ask your freight forwarder to review the options.
Arrange Reefer Container Shipping With Power Forwarding
Power Forwarding helps businesses arrange refrigerated freight for chilled, frozen and temperature-sensitive goods, including reefer container shipments between China and the UK.
Our team can help coordinate the sea freight booking, collection, port handling, customs clearance and onward UK delivery, with the cargo requirements reviewed before the shipment moves.
Whether you are arranging a one-off refrigerated shipment or importing temperature-controlled goods regularly, speaking to the freight team early gives you more time to check equipment, routing, documentation and handling requirements.
For your next temperature-sensitive shipment, speak to Power Forwarding about your cargo, required temperature, origin and destination and we can help you plan the appropriate reefer shipping arrangements.
