“Explosive”, as used in this chapter, means any chemical compound or any mechanical mixture that contains oxidizing and combustible units or other ingredients in such proportions, quantities or packing that ignition by fire, friction, concussion, percussion or detonator may cause such a sudden generation of highly heated gases that the resultant gaseous pressure is capable of destroying life or limb or of producing destructive effects to contiguous objects, but not including colloided nitrocellulose in sheets or rods or grains not under one-eighth of an inch in diameter, wet nitrocellulose containing twenty per cent or more moisture and wet nitrostarch containing twenty per cent or more moisture; and manufactured articles shall not be held to be explosive when the individual units contain explosives in such limited quantity, of such nature or in such packing that it is impossible to produce a simultaneous or a destructive explosion of such units to the injury of life, limb or property by fire, friction, concussion, percussion or detonator, including fixed ammunition for small arms, firecrackers, safety fuses and matches. “Explosive”, as used in this chapter, shall not be deemed to include gasoline, kerosene, naphtha, turpentine or benzine.