This Regulation establishes EU-wide rules for the making available introduction, possession and use of substances and mixtures that could be misused to make homemade explosives. The Regulation limits the availability of those substances or mixtures to the general public, and requires any suspicious transactions involving the substances to be reported to the appropriate authorities, and reinforces the system to prevent the illicit manufacture of explosives, as a response to the evolving threat that terrorism and other serious criminal activities pose to public security.