Carbon dioxide, solid (Dry ice)

“Packages containing dry ice (UN No. 1845) or a coolant or conditioner shall be carried in well ventilated vehicles and containers. Marking according to 5.5.3.6 is not required in this case. Ventilation is not required, and marking according to 5.5.3.6 is required, if: - Gas exchange between the load compartment and the driver’s cab is prevented; or - The load compartment is insulated, refrigerated or mechanically refrigerated equipment, for example as defined in the Agreement on the International Carriage of Perishable Foodstuffs and on the Special Equipment to be Used for such Carriage (ATP) and separated from the driver’s cab.”

NOTE: In this context "well ventilated" means there is an atmosphere where the carbon dioxide concentration is below 0.5 % by volume and the oxygen concentration is above 19.5 % by volume.

“Packages containing dry ice (UN No. 1845) as a consignment shall be marked "CARBON DIOXIDE, SOLID" or "DRY ICE"; packages containing dangerous goods used for cooling or conditioning shall be marked with the name indicated in Column (2) of Table A of Chapter 3.2 of these dangerous goods followed by the words "AS COOLANT" or "AS CONDITIONER" as appropriate in an official language of the country of origin and also, if that language is not English, French or German, in English, French or German, unless agreements concluded between the countries concerned in the transport operation provide otherwise.”

“Vehicles and containers containing dry ice (UN No. 1845) or dangerous goods used for cooling or conditioning purposes that are not well ventilated shall be marked with a warning mark, as specified in 5.5.3.6.2, affixed at each access point in a location where it will be easily seen by persons opening or entering the vehicle or container. This mark shall remain on the vehicle or container until the following provisions are met: (a) The vehicle or container has been well ventilated to remove harmful concentrations of dry ice (UN No. 1845) or coolant or conditioner; and (b) The dry ice (UN No. 1845) or cooled or conditioned goods have been unloaded. As long as the vehicle or container is marked, the necessary precautions have to be taken before entering it. The necessity of ventilating through the cargo doors or other means (e.g. forced ventilation) has to be evaluated and included in training of the involved persons.”

“The warning mark shall be as shown in Figure 5.5.3.6.2. The mark shall be a rectangle. The minimum dimensions shall be 150 mm wide × 250 mm high. The word "WARNING" shall be in red or white and be at least 25 mm high. Where dimensions are not specified, all features shall be in approximate proportion to those shown.”

“Documents (such as a bill of lading, cargo manifest or CMR/CIM consignment note) associated with the carriage of vehicles or containers containing or having contained dry ice (UN No. 1845) or substances used for cooling or conditioning purposes and have not been completely ventilated before carriage shall include the following information: (a) The UN number preceded by the letters "UN"; and (b) The name indicated in Column (2) of Table A of Chapter 3.2 followed, where appropriate, by the words "AS COOLANT" or "AS CONDITIONER" in an official language of the country of origin and also, if that language is not English, French or German, in English, French or German, unless agreements, if any, concluded between the countries concerned in the transport operation provide otherwise.”

For example: UN 1845, CARBON DIOXIDE, SOLID, AS COOLANT.

“If dry ice in unpackaged form is used, it shall not come into direct contact with the metal structure of a vehicle or container to avoid embrittlement of the metal. Measures shall be taken to provide adequate insulation between the dry ice and the vehicle or container by providing a minimum of 30 mm separation (e.g. by using suitable low heat conducting materials such as timber planks, pallets etc).”

“Persons engaged in the handling or carriage of vehicles and containers in which dry ice (UN No. 1845) is carried or containing substances used for cooling or conditioning purposes shall be trained commensurate with their responsibilities.”