What is the cold chain?

What does the cold chain mean?

The cold chain is the operating system that keeps a temperature-sensitive product within its specified conditions without interruption from production to delivery or use. A cold store or refrigerated vehicle is not a chain by itself. Receipt, holding, loading, transport, unloading and handover must all work to the same product condition; otherwise they are merely separate cooled points.

The applicable condition is identified product by product. Food operations look to the rule for the relevant category. Pharmaceutical operations start with the marketing authorisation conditions and the applicable distribution rules. Describing the cold chain with one temperature is therefore misleading, since products sharing a warehouse or vehicle may not share the same permitted condition.

Continuity means more than seeing an acceptable value on a display. The measurement must represent the operation, the device must sit in an appropriate position, records must remain available, and an excursion must be traceable to the conditions the product encountered. For procurement, the first question is the product condition to protect, not the name of a piece of equipment.

Which operations make up the chain?

The chain begins at production or preparation and continues through storage, order assembly, loading, carriage, transfer, unloading and holding at the point of sale or use. A business may control only part of that journey, but it still has to define the conditions under which it accepts and hands over the goods. Responsibility changes hands; the product requirement does not.

If goods leave production before reaching their required condition, transport equipment is being asked to pull them down from a process temperature. The transport arrangement is meant to hold accepted goods within their specified condition. Waiting space in the warehouse, time at the dock and placement inside the vehicle are where this distinction becomes visible in daily work.

Three pieces of information travel together at a handover: the acceptance condition, the measured state and the party taking custody of the record. A conflict between the label or dispatch document and the warehouse or transport instruction should be resolved before the load moves. The separate article on how to preserve the cold chain develops these controls for operational handovers.

Which temperature condition applies to a product?

The applicable temperature is selected only after the product and its scope are identified; there is no common table for all fresh foods or all medicines. The rows below are deliberately narrow and include only conditions verified in Turkish primary sources. Read each value together with its source and limitation.

The table is not a dispatch instruction. Where a narrow statutory category, marketing authorisation or outer pack gives a more specific condition, the operation must follow that condition. The separate cold chain temperature range article examines the transport context and the relationship between temperature and equipment class in more depth.

How should the quick-frozen regime be read?

In Türkiye, the Türk Gıda Kodeksi Hızlı Dondurulmuş Gıdalar Tebliği requires covered products to be stabilised and kept at -18 °C or lower at every point. A reading that represents only vehicle air does not directly answer a requirement expressed for all points in the product. The air record and the product acceptance check serve different purposes.

The communiqué permits a short rise of no more than 3 °C only during transport and distribution and in retail display cabinets. Extending that allowance to storage would add something the source does not say. The provision also excludes ice cream and edible ice, so the presence of frozen in a product description is not enough to establish scope.

If goods fail the acceptance condition before loading, an insulated container, refrigerated body or other transport solution cannot correct that earlier status retroactively. The dispatch decision belongs with product control. Door and lid movements, waiting and transfer should remain tied to the same record trail so that an excursion can be located within the journey.

At which handovers do excursions develop?

The chain is often strained during short contacts between two controlled spaces: goods wait at a dock, a door stays open because the loading sequence is not ready, a transport container has not been pre-cooled, or the goods are paired with a cold source prepared for the wrong regime. The failure may belong to the handover sequence rather than to one machine.

Opening a lid changes the air condition inside. The size of the effect depends on ambient conditions, open time, load arrangement and the system in use. The source dossier verifies no general temperature loss or duration for these events, so this page assigns none. For the same reason, a safe universal stop count cannot be derived from a general guide.

Loading without pre-cooling deserves its own check. If the transport container has not been brought into the preparation regime, part of the available cold first deals with the container surfaces and air. A cold source prepared for the wrong regime creates a different mismatch. The separate article explaining what a cold-chain break is goes further into definitions and field causes.

What should temperature monitoring record?

A useful record shows more than a temperature value. It identifies when and where the reading was taken and the consignment it represents. Device position and measurement method are defined in advance, and the receiving party must be able to connect the record to the goods. When an alarm occurs, the assessment that follows belongs in the same event file.

For quick-frozen foods in Türkiye, ambient temperature is recorded frequently and at regular intervals with suitable measuring and recording devices, with date and time. Turkish Food Codex 2014/48 requires retention for at least 1 year, or longer when the nature and shelf life of the food require it. This is not a universal cold-chain retention period; its scope is quick-frozen food.

The same communiqué allows a visible thermometer for retail cold stores below 10 m3 and for specified retail cabinets. That narrow exception does not remove the recording arrangement from other storage or transport points.

Under Türkiye's pharmaceutical GDP system, records and backed-up data are retained for at least 5 years. The GDP guide includes applicable transport and storage conditions and environmental-control records in that system. Route risk assessment determines where temperature control is required, and monitoring equipment is calibrated. The separate article on how to preserve the cold chain places records alongside the other field controls.

Which rules apply to food operations in Türkiye?

Food cold-chain duties in Türkiye do not come from one document. A product category's temperature provision, hygiene duties, monitoring rules and the international status of a journey lead to different sources. The table on this page consolidates only verified categories; it does not assign a temperature to an unnamed product by analogy.

Under Gıda Hijyeni Yönetmeliği, or the Food Hygiene Regulation, Article 22 requires a food business carrying out production, processing or distribution after primary production and related operations to put in place, implement and maintain a permanent procedure based on HACCP principles. The same wording cannot be extended to primary production, which has separate hygiene and record rules.

ATP governs the international carriage of perishable foodstuffs and the special insulated, refrigerated, mechanically refrigerated and heated equipment used for it. Türkiye is a contracting party. ATP applies to international carriage between the territories of at least two contracting parties; it should not be presented as covering every domestic movement in Türkiye.

The competent authority in the country of registration or recording issues the ATP certificate of compliance, which travels with the equipment; a compliance plate may replace it. Recognition based on test results is valid for no more than 6 years and the inspection cycle is at least once every 6 years. Temporary documents and later extensions have different periods. Articles under the regulations and standards tag map the broader framework, while the Isotec documents and temperature record page treats ATP evidence in greater detail.

How is the pharmaceutical side managed in Türkiye?

In Türkiye, medicines that TİTCK classifies as cold-chain products are stored, held and distributed at 2-8 °C and under the conditions set by the marketing authorisation holder. The range is not common to all medicinal products. The conditions in each product's marketing authorisation and on its outer packaging must also be checked.

TİTCK's 2022 Beşeri Tıbbi Ürünler İçin İyi Dağıtım Uygulamaları Kılavuzu, the Good Distribution Practice Guide for Medicinal Products for Human Use, requires the product's storage conditions to be maintained during dispatch. Written procedures address temperature excursions. Delivery-route risk assessment identifies where temperature control is needed, and monitoring equipment in vehicles or containers is calibrated regularly, at least once a year.

Temperature-sensitive products use qualified packaging, containers or temperature-controlled transport. Monitoring in temperature-controlled vehicles is maintained and calibrated; temperature mapping is performed under representative conditions and seasonal variation is considered. These procedures do not replace the product condition. They describe how that condition is maintained during distribution.

Food and pharmaceutical records therefore cannot be assigned one retention period. GDP records and backed-up data are kept for at least 5 years, while the rule of at least 1 year for quick-frozen food comes from another source with another scope. A record plan starts by separating the product classes.

Where do active and passive cooling differ?

Active cooling removes heat through a refrigeration unit that consumes energy while operating. Passive cooling combines insulation with a cold source prepared in advance; the transport container need not carry a running compressor. Under either approach, the goods must be accepted in their specified condition and temperature must be monitored.

The choice is not made from the vehicle name alone. Route, transfers, door and lid movements, preparation capacity at the depot, product condition and record needs all matter. The reefer vehicle, dry ice and expanded-polystyrene comparison page sets those solutions side by side; this reference page does not repeat that comparison.

In a passive system, pre-cooling brings the transport container into its preparation condition before loading. GEBHARDT recommends pre-cooling Isotec TBX for 12-20 hours. GEBHARDT's Isotec TBX product page gives 0 to +2 °C for the fresh zone and -21 to -25 °C for the deep-freeze zone. These are preparation targets for that container, not product-temperature rules under the Turkish Food Codex or ATP.

The deep-freeze preparation target must not be confused with the quick-frozen food requirement. The -21 to -25 °C figure prepares the Isotec TBX container before loading; the verified product rule is -18 °C or lower. The 0 to +2 °C fresh-zone figure is not a general food standard either, which is why it does not appear in the temperature table.

What belongs on the equipment side?

Equipment is selected after the product condition, route and record plan are defined. Aris Makina supplies GEBHARDT Isotec transport containers and related cold sources in Türkiye; it does not make the equipment or carry the goods. Application options are collected on the cold chain transport equipment page, while the brand programme is covered in the GEBHARDT Isotec guide.

A procurement file should list the container's insulation role, preparation of the cold source, cleaning arrangement, loading method and monitoring responsibility separately. The equipment specification then remains one component of the operation that protects the statutory or authorised product condition; it does not replace that condition.

When were the sources checked?

The numeric and regulatory statements on this page were checked against primary sources on 11 August 2026. Food temperatures use Türk Gıda Kodeksi Hızlı Dondurulmuş Gıdalar Tebliği 2014/47 and Hayvansal Gıdalar İçin Özel Hijyen Kuralları Yönetmeliği. Monitoring uses Turkish Food Codex 2014/48, and HACCP uses Gıda Hijyeni Yönetmeliği Article 22.

The pharmaceutical section relies on TİTCK's Cold Chain Products notice of 27 December 2018 and its 2022 GDP guide. International food carriage uses UNECE ATP 2024. The Isotec TBX pre-cooling statement comes from GEBHARDT's official product page. The source links below keep each scope and limitation available for direct review.