aluminum sodium sulfate
aluminum sodium sulfate[ə′lüm·ə·nəm ′sōd·ē·əm ′səl‚fāt]
AlNa(SO4)2· 12H2O Colorless crystals with an astringent taste and a melting point of 61°C; soluble in water; used as a mordant and for waterproofing textiles, as a food additive, and for matches, tanning, ceramics, engraving, and water purification. Abbreviated SAS. Also known as porous alum; soda alum; sodium aluminum sulfate.