Crystalline aluminum, also known as hexahydrate aluminum, is an inorganic compound with the chemical formula AlCl3·6H2O. This substance is a white crystalline powder that dissolves in water but not in organic solvents. Its melting point is 63.5°C, and its boiling point is 181°C. Crystalline aluminum finds extensive applications across various fields. In the paper industry, it serves as a sizing agent to enhance the quality and strength of paper. In the fire industry, it is mixed with baking soda and foaming agents to form multi-foam fire extinguishers for extinguishing fires caused by petroleum and organic solvents. In the inorganic industry, it is used to produce other aluminum salts, such as aluminum sulfate, potash alum, and ammonium alum. In the organic industry, it can act as a catalyst for organic synthesis, like the catalyst for dyeing blue. In the pharmaceutical industry, it can be used as astringents, anticaries agents, anticoagulants, antiperspirants, and hemostatic agents. Moreover, in the oil industry, crystalline aluminum can be used as a mud stabilizer in oil well drilling and for treating oily wastewater. Note that crystalline aluminum can irritate the skin, eyes, and mucous membranes, and inhalation may cause coughing and respiratory irritation. During production and use, adhere to safety operating procedures, ensure good ventilation, wear protective gear, and avoid direct contact. In case of accidental contact, rinse with clean water immediately and seek medical attention.