... is fragile. The solid caustic soda has very strong hygroscopicity. Apt to dissolve it in water, send out heat when ... corroding on fibre , skin , glass , pottery ,etc.. ApplicationCaustic soda is widely used as alkaline desiccant in paper, aluminum smelting ... organic intermediates, old rubber regeneration system of metallic sodium, water electrolysis, as well as inorganic salt production, preparation of ...