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 gukuramo imyuka y'amazi (deliquescent) Dioxyde de carbone (kwangirika) mu kirere, kandi ishobora kongerwamo aside hydrochloric kugirango irebe niba yangiritse.