(We would like an explanation of Elevated temperature substances.)

There are three Elevated temperature substances listed in DGR 4.2 blue pages, i.e., UN 3257 Elevated temperature liquid n.o.s.*, UN 3256 Elevated temperature liquid, flammable, n.o.s.* and UN 3258 Elevated temperature solid n.o.s.*. All three items are forbidden for air transport, however, each have additional condition-like entries written in light print. What is the criteria to allow these items to be allowed for air transportation? The conditions in light print is difficult to understand. (31 May 13)

The entries in bold dark print shown in Column B of DGR 4.2 List of Dangerous Goods represent Proper Shipping Names (PSN) to be used for declaring dangerous goods on the Shipper’s Declaration for Dangerous Goods.

The light print which follow the PSN are explanatory entries of the PSN. They are not conditions for carriage but are definitions of the PSN. For instance, the definition of UN 3257 is that the liquid “is at or above 100 degrees C and below its flash point (including molten metals, molten salts, etc)”. Similar light print entries following the PSNs of UN 3256 and UN 3258 are also definitions and not allowable conditions. The definitions of these three substances are also shown in Appendix A under Elevated temperature substance.

Elevated temperature substances are fundamentally forbidden for air transportation as listed in DGR 2.1.2 (e). For exemption, the shipper must obtain approvals from the States concerned per DGR

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