Cold Chain

The Cold Chain is the end-to-end temperature-controlled logistics chain for perishable or temperature-sensitive cargo — including fresh produce, meat, dairy, seafood, flowers, pharmaceuticals (especially vaccines and biologics), and biotech samples. Temperature requirements range from frozen (-25°C to -18°C) through chilled (0°C to 4°C) to controlled-room-temperature (15°C to 25°C) for sensitive pharma.

The chain involves: reefer containers (refrigerated ISO containers with their own machinery — typically 20' or 40'), reefer trailers for road, temperature-controlled warehouses, pharma-grade airfreight ULDs (CSafe, Envirotainer), and continuous monitoring via data loggers and IoT sensors. GDP (Good Distribution Practice) compliance is mandatory for pharma cold chain.

The hardest part is the "last mile" and any transfer points — a 30-minute temperature excursion at the port gate or during a customs delay can ruin a $1M pharma shipment. Modern platforms continuously monitor temperature, flag deviations, and produce audit-ready compliance reports.