Crimes Ordinance Part VIIA 7A-12 Section 58G Cap. 200 Name of detection agent Molecular formula Molecular Minimum weight concentration Ethylene glycol dinitrate (EGDN) C2H4(NO3)2 152 0.2% by mass 2, 3-Dimethyl-2, 3-dinitrobutane (DMNB) C6H12(NO2)2 176 0.1% by mass para-Mononitrotoluene (p-MNT) C7H7NO2 137 0.5% by mass orthoMononitrotoluene (o-MNT) C7H7NO2 137 0.5% by mass (5) The Secretary for Security may by order published in the Gazette— (a) amend subsection (1) in the definition of plastic explosive (塑膠炸藥) by adding or deleting any substance specified in that subsection to be a high explosive; (b) amend subsection (4) by adding or deleting any substance designated for use as a detection agent and by specifying the minimum concentration for such agent. (6) For the purpose of this Part, a certificate purporting to be signed by the Government Chemist stating that a particular explosive substance has properties similar to a substance specified in the definition of plastic explosive (塑膠炸藥) in subsection (1) to be a high explosive shall be admissible as evidence of the fact so stated. Verified Copy Last updated date 16.11.2017