Commonwealth Numbered Regulations Commonwealth Numbered RegulationsFor the purposes of subparagraph 471.15(1)(b)(ii) of the Code, the following are dangerous or harmful substances or things that must not, without exception, be carried by post:
(a) gas that is so toxic or corrosive to humans as to pose a hazard to health;
(b) a thermally unstable substance that is likely to undergo a strongly exothermic decomposition;
(c) a substance that ignites or self-heats when in contact with air.