Which container code is cryogenic service?

• A. 06
• B. 12
• C. 31
• D. 38

Answer: (D)

Container codes show what service a packaging is designed for and the conditions it can handle. Cryogenic service means the container is made for extremely cold liquids and uses features like double-walled vacuum insulation and venting to manage boil-off and pressure. The code that denotes cryogenic service is 38, the designation used for cryogenic dewars. The other codes correspond to different service types and are not appropriate for cryogenic shipments.