This substance is assigned to packing group I because it is toxic when inhaled, among other reasons. Special provision A4 prohibits the carriage of this substance on passenger aircraft; however, it may be transported on cargo aircraft under the conditions specified in that special provision.
Liquids that are highly toxic upon inhalation shall, in any case, be assigned to Class 6.1 in accordance with 2;0.4.1 of the ICAO TI - even if the flash-point is below 23°C.