May stainless steel be used as the required floor lining when transporting Division 1.1, 1.2, or 1.3 explosives?
Correct answer: B – No, the lining must be nonmetallic or non-ferrous
Federal explosives-carriage rules require tight floors and a load-contact surface lined with nonmetallic material or non-ferrous metal. Stainless steel contains iron and is not a non-ferrous lining material. Arizona’s CDL manual uses the same distinction when describing the required floor lining for Division 1.1, 1.2, and 1.3 explosives.
Source: Arizona Commercial Driver License Manual — § 9.4, “Loading and Unloading”, 49 CFR § 177.835(f) — Class 1 (Explosive) Materials

