Caustic Soda ni alkali ikomeye ifite ruswa ikomeye, mubisanzwe muburyo bwa flake cyangwa bloks, gushonga byoroshye mumazi (exothermic iyo yashongeshejwe mumazi) kandi ikora igisubizo cya alkaline, na deliquescent
Imibonano mpuzabitsina, biroroshye kwinjiza imyuka y'amazi (deliquescent) na dioxyde de carbone (kwangirika) mu kirere, kandi ishobora kongerwamo aside aside ya hydrochlorike kugirango urebe niba yangiritse.