UNSTABLE (REACTIVE) MATERIAL. A material, other than an explosive, which in the pure state or as commercially produced, will vigorously polymerize, decompose, condense or become self-reactive and undergo other violent chemical changes, including explosion, when exposed to heat, friction or shock, or in the absence of an inhibitor, or in the presence of contaminants, or in contact with incompatible materials. Unstable (reactive) materials are subdivided as follows:
In addition, Class 3 and 4 unstable (reactive) detonable materials shall be stored in accordance with the Building Code of New York State requirements for explosives.
Exception: Materials stored in tanks.