(a) the expression “explosive substance” shall be deemed to include any materials for making any explosive substance; also any apparatus, machine, implement or material used, or intended to be used, or adapted for causing, or aiding in causing, any explosion in or with any explosive substance; also any part of any such apparatus, machine or implement;

(b) the expression “special category explosive substance” shall be deemed to include research development explosive (RDX), penta erythritol tetra nitrate (PETN), high melting explosive (HMX), tri nitro toluene (TNT), low temperature plastic explosive (LTPE), composition exploding (CE) (2, 4, 6 phenyl methyl nitramine or tetryl), OCTOL (mixture of high melting explosive and tri nitro toluene), plastic explosive kirkee -1 (PEK-1) and RDX/TNT compounds and other similar type of explosives and a combination thereof and remote control devices causing explosion and any other substance and a combination thereof which the Central Government may, by notification in the Official Gazette, specify or the purposes of this Act.