What Is Reefer Container?

The easily ignored specialized container for temperature-controlled cargo

Definition

A Reefer Container is an insulated, refrigerated container built with a built-in cooling system, used to transport goods that require fixed temperature, humidity and ventilation control during sea or air shipping.

Unlike standard dry containers, it can cool, heat, keep fresh and maintain a constant temperature across long voyages.

Main Temperature Range

Deep frozen: -25℃ ~ -18℃ (seafood, meat, ice cream)
Chilled: 0℃ ~ 4℃ (fruit, vegetable, dairy)
Constant temperature: 10℃ ~ 20℃ (wine, chocolate, pharmaceutical products)

Core Features

Built-in refrigeration unit, connected to power supply on vessel and terminal.
Fully insulated box body to isolate outside temperature.
Adjustable temperature, ventilation and humidity settings.
Real-time temperature monitoring and data recording.
Strict stowage rules: no blocking air vents, leave gap for air circulation.

Common Cargo for Reefer Container

Fresh fruits, vegetables, flowers
Frozen meat, seafood, poultry
Wine, beverages, dairy products
Pharmaceuticals, vaccines, biological samples
Chocolate, high-end snacks sensitive to temperature

Hidden Risks Easily Overlooked

Improper pre-cooling before loading leads to temperature deviation.
Cargo over-stacking blocks air circulation, causing partial spoilage.
Power cut during transshipment leads to goods deterioration.
Incorrect temperature setting by warehouse staff.
Long waiting time at terminal without power supply.

Special Operation Rules

Must pre-cool the container to target temperature before stuffing.
Cargo should also be pre-cooled, not put room-temperature goods directly in.
Leave gaps between cartons for cold air flow.
Avoid overloading; follow reefer container load limit.
Monitor temperature data throughout the whole voyage.

Why Reefer Freight Costs More

Higher container rental and maintenance fees
Power consumption cost at port and on vessel
Professional inspection and dedicated stowage position
Strict operation requirements and higher liability risk

Key Takeaway

Reefer container is the professional solution for cold chain logistics. It’s not just a “cool box”, but a precise temperature-controlled transport device. Ignoring its loading rules and temperature requirements will easily cause cargo spoilage and huge economic losses. Mastering basic reefer shipping rules is essential for frozen, fresh and high-value temperature-sensitive shipments.

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