Gunpowder yana ƙarƙashin rukunin abubuwan fashewa, wani yanki na kayan haɗari.
Waɗannan kayan sun ƙunshi kewayon abubuwan da aka sani don ƙonewa, fashewa, yanayi mai lalata, guba, da radioactivity. Misalai sun haɗa da man fetur, bindiga, maida hankali acid da tushe, benzene, naphthalene, celluloid, da kuma peroxides. Yana da mahimmanci cewa ana sarrafa waɗannan kayan bisa ga ƙaƙƙarfan ƙa'idodin kayan haɗari yayin sufuri da adanawa don tabbatar da aminci da yarda..