Potassium aluminum sulfate dodecahydrate
White, odorless powder or colorless crystals.
Used as a mordant in dyeing, in tawing skins and as a coagulating agent for latex. Used in the gypsum industry as a hardening agent and setting accelerator for the production of marble cement and alabaster plaster. Used as a styptic pencil; as a catalyst in the production of ammonia; and as a food additive. Used in the pharmaceutical and cosmetics industries as an astringent and antiseptic.
Registry Numbers and Inventories.
S 26 36
Japan ENCS (MITI)
AlKO8S2 . 12 H2O
Melting point, °C
Decomposition point, °C
Vapor density (air=1)
1.72 g/cm3 (20 C)
Solubility in water
139 g/L (20 C)
3.8 (20 C)
Hazards and Protection.
Store in a cool, dry place. Keep containers tightly closed. Keep away from strong bases.
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Wash clothing before reuse. Discard contaminated shoes.
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.
Stable under normal temperatures and pressures.
Strong oxidizing agents, steel, aluminum, copper, zinc.
Oxides of sulfur, aluminum oxide, oxides of potassium.
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam. Use agent most appropriate to extinguish fire.
5 (Substances and products with a low hazard& potential)
Ingestion of large amounts may cause gastrointestinal irritation.
Dust is irritating to the respiratory tract.
Contact with skin causes irritation and possible burns, especially if the skin is wet or moist.
Causes eye irritation.
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid if irritation or symptoms occur.
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear.
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.
2833 30 00