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Compare full-pack cost and measured temperature profile for the same load and route.

Classify shipments by product requirements, approved fallback coolant and delivery window.

Before combining coolants, verify product range, container design and carrier conditions.

Do not add a fixed percentage to winter quantities. Measure dry-ice mass, vehicle environment and product temperature on comparable loads and routes.

Dry ice depletion does not reveal product condition. Record product temperature, remaining ice and route conditions together.

By air, dry ice is dangerous goods under UN 1845. Carriers that accept it require a declaration, a Class 9 label, the net quantity and packaging that lets the gas escape.

Divide the invoice by kilograms weighed before use, not by quoted unit price. Compare delivery, return and packaging on the same basis.

Dry ice sublimates while it waits: about 2% an hour in a foam box, 14% for small paper-wrapped blocks. So the order is planned back from the loading hour and the waiting loss is added to the quantity.

A small paper-wrapped block loses 14 per cent of its mass per hour, pellets in a foam box 2 per cent. The life of a kilo is set by the container, piece size and outside temperature.

The dry ice you need is the container's hourly consumption multiplied by the worst-case hours of the trip. Hourly consumption is found once by weighing, and it grows with surface area, not volume, as the container gets bigger.

The amount of dry ice is set by the carrier's acceptance rules as much as by what the product needs. That can mean splitting the shipment, choosing a better insulated container or shortening the route.

Make dry ice locations, owners, CO₂ monitoring and emergency steps visible in the procedure. Review legal duties with a safety specialist.

Do not assume one emissions factor for dry ice. Record consumed quantity, supplier-data boundary and the reporting method together.

Choose by product requirements, route, supply and preparation capacity. Trial both arrangements with the same load and compare your records.

Dry ice shrinks even when nobody uses it: every watt of heat entering the box turns some of it to gas. Four weighings measure the loss, and your actual purchase price turns it into cost.

Plan for a dry ice interruption using your own supply and usage records, not assumed market rates. Trial a backup on route.