Crystalline aluminum, also known as hexahydrate aluminum, is an inorganic compound with the chemical formula AlCl3·6H2O. This substance is a white crystalline powder, soluble 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 in various fields. In the paper industry, it serves as a sizing agent to enhance the quality and strength of paper. In the fire protection industry, it is combined with baking soda and foaming agents to form multi-foam fire extinguishers, used to extinguish fires caused by oil, organic solvents, and more. In the inorganic industry, it is used to produce other aluminum salts such as alum, ammonium alum, and more. In the organic industry, it can act as a catalyst for organic synthesis, such as in the synthesis of dye blue. In the pharmaceutical industry, it can be used as astringents, anticaries agents, anticoagulants, antiperspirants, hemostatic agents, and more. Additionally, in the oil industry, crystalline aluminum can be used as a mud stabilizer for oil well drilling and for treating oily wastewater. Please note that crystalline aluminum is irritating to the skin, eyes, and mucous membranes; inhalation can cause coughing and respiratory irritation. During production and use, adhere to relevant safety operating procedures to ensure good ventilation in the work environment, wear protective gear, and avoid direct contact. In case of accidental contact, rinse with clean water immediately and seek medical assistance.