ʻO ka Caustic Soda he alkali ikaika me ka corrosiveness ikaika, ma ke ʻano he flakes a i ʻole poloka, hiki ke hoʻoheheʻe ʻia i ka wai (exothermic ke hoʻoheheʻe ʻia i loko o ka wai) a hana i kahi hopena alkaline, a me ka deliquescent Ma ka moekolohe, ua maʻalahi ke komo i ka mahu wai (deliquescent) a me carbon dioxide (deterioration) i loko o ka lewa, a hiki ke hoʻohui ʻia me ka waika hydrochloric e nānā inā ua deteriorated.