46 C.F.R. § 150.140
Cargoes not listed in Table 1 or 2
A cargo of hazardous material not listed in Table I or II must be handled as if incompatible with all other cargoes until the Commandant CG-ENG-5) (Telephone 202-372-1420) assigns the hazardous material to a compatibility group. (Table I lists cargoes alphabetically while Table II lists cargoes by compatibility group).