The cold chain rule fits one sentence: a temperature-sensitive product is kept within its own condition without interruption from production to handover, and a record proves it. Reducing the rule to a single degree misleads, because the condition changes from product to product, and two products in the same vehicle may have different permitted ranges.

Why the rule is not one number. For quick-frozen food, the Turkish Food Codex requires -18 °C or lower at every point of the product. For minced meat the same body of regulation caps internal temperature at 2 °C. Fresh fish is held near the melting point of ice. Medicines classified as cold-chain products by TİTCK travel in the 2-8 °C band. Four products, four separate conditions: the rule does not set them, it demands they be protected.

Three legs: condition, continuity, proof

The first leg is the condition. No temperature is chosen before the product and its scope are named; the condition is read from the label, the regulation or the authorisation, never assigned by analogy.

The second leg is continuity. The chain rarely breaks in the warehouse, the vehicle or the display cabinet; it breaks between them, at handovers: a pallet waiting on the dock, a lid left open, a container loaded without pre-cooling. Responsibility changes hands, the product's need does not.

The third leg is proof. Carrying at the right temperature is not enough; the record must show when, where and for which consignment the reading was taken. Without it, an excursion is argued from memory, and memory does not pass an audit.

The three points most often broken in the field

  • Goods are loaded before reaching their target temperature; neither an insulated container nor a reefer body closes that gap retroactively.
  • The short 3 °C allowance for quick-frozen food gets applied to storage; the allowance covers only transport, distribution and retail cabinets.
  • Recording starts after an excursion has already happened; yet a decision can only be made on an uninterrupted record.

An excursion goes unnoticed most where no record is kept, and an audit asks about that point first.

What happens at the moment the rule fails, and with what consequences, belongs to separate articles: the definition of a break, spoilage thresholds by degree, and the tolerance line for frozen goods read like the continuation of this page.