Temperature-controlled transport is one of the least forgiving areas of haulage. Get it right and the goods arrive exactly as they left; get it wrong and an entire load can be condemned. Whether you are moving chilled food, frozen produce or temperature-sensitive pharmaceuticals, knowing the correct temperature bands and the rules behind them protects both your stock and your reputation.
Chilled versus frozen: the core temperature bands
The two broad categories are chilled and frozen, and they call for very different equipment settings.
Chilled goods
Chilled products are typically carried between 0°C and 8°C, with many fresh foods such as dairy, meat and prepared meals sitting around 1°C to 5°C. The aim is to hold the product just above freezing without ever letting it dip below, which would damage texture and quality.
Frozen goods
Frozen transport runs much colder. Under the international ATP standard, deep-frozen fish, shellfish and similar products must be kept at -18°C or below, ice cream is held at around -20°C, and most other frozen foods at no warmer than -12°C. Frozen butter and concentrated fruit juice have a slightly higher limit of around -10°C. The principle is an unbroken cold chain: the product never partially thaws and refreezes.
Food versus pharmaceutical loads
Food and pharma are governed by different frameworks even though both rely on refrigerated vehicles.
Food transport across much of Europe falls under the ATP agreement (Accord Transport Perishable), which sets insulation and refrigeration standards for the vehicle body itself. In the UK, ATP certification and testing is overseen by the Refrigerated Vehicle Test Centre on behalf of the Department for Transport, with equipment re-tested every six years and interim checks in between.
Pharmaceuticals sit outside ATP and instead follow Good Distribution Practice (GDP). The classic pharma cold-chain band is 2°C to 8°C, with controlled-room-temperature products often needing 15°C to 25°C. Pharma work demands continuous data logging, validated temperature mapping of the vehicle, and full traceability, so a single excursion can be identified and investigated.
What the equipment has to deliver
- Insulated bodywork that meets the required K-coefficient so heat ingress stays within limits
- A refrigeration unit capable of holding the set point across the full journey, not just at the start
- Calibrated temperature monitoring and, for pharma and many food contracts, continuous logging you can produce as evidence
- Multi-compartment trailers where chilled and frozen need to travel together
- Strict loading discipline so pre-chilled stock is not left standing in a warm yard
Protecting the cold chain in practice
The most common failures are not equipment breakdowns but handling errors: loading product that was never properly pre-cooled, leaving doors open during multi-drop work, or overloading so cold air cannot circulate. Good operators pre-cool the trailer before loading, plan drops to minimise door-open time, and record temperatures throughout so any issue is caught early rather than discovered on arrival.
Why documentation matters as much as temperature
For many customers, especially in food retail and pharmaceuticals, it is not enough for the goods to arrive at the right temperature; you have to be able to prove they stayed there for the whole journey. That is why temperature logging has become standard on serious cold-chain work. A continuous data record shows the set point was held from loading to delivery, and if a query ever arises, the trace settles it quickly. Retail and pharma audits increasingly expect this evidence, and a load without it can be rejected on principle even if the product is perfectly fine.
There is also a regulatory backdrop. Food businesses must keep chilled and frozen goods within legal temperature limits throughout distribution, and pharmaceutical distribution under GDP requires validated processes and trained staff. Choosing a carrier that understands these obligations, rather than simply owning a fridge trailer, is what keeps you on the right side of both your customers and the rules.
If you need chilled or frozen goods moved with the cold chain kept intact and properly documented, Northampton Road Haulage can advise on the right vehicle and temperature regime for your product. Call our Northampton team on 01604 385213 for a no-obligation quote and honest advice on the right approach for your load.