Caustic Soda yog ib qho muaj zog alkali uas muaj zog corrosiveness, feem ntau nyob rau hauv daim ntawv ntawm flakes los yog blocks, yooj yim soluble nyob rau hauv dej (exothermic thaum yaj nyob rau hauv dej) thiab tsim ib tug alkaline tov, thiab deliquescent kev sib deev, nws yog ib qho yooj yim mus nqus dej vapor (deliquescent) thiab carbon dioxide (deterioration) nyob rau hauv cov huab cua, thiab nws yuav muab ntxiv nrog hydrochloric acid los xyuas seb nws puas deteriorated.