An HME is an explosive material made using commonly available or improvised ingredients. It is typically produced by individuals or small groups using simple methods and equipment, often without formal training or expertise in explosives chemistry.
HMEs are made from various substances, including household chemicals, agricultural fertilisers, industrial solvents, and other readily available materials. These substances are often mixed and processed to create a volatile explosive compound. Due to their improvised nature, HMEs vary widely in composition, potency, and stability. Their potential for accidental detonation or unintended consequences may pose significant safety risks to the individuals manufacturing them and others in the vicinity.