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 has a wide range of applications across various industries. 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 used in combination with baking soda and foaming agents to create multi-foam fire extinguishers, effective against fires caused by oil, organic solvents, and more. In the inorganic industry, it is employed in the production of other aluminum salts, such as alum, 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. Additionally, in the oil industry, crystalline aluminum can be used as a mud stabilizer in oil well drilling and for treating oily wastewater. Please note that crystalline aluminum is irritating to the skin, eyes, and mucous membranes, and 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 immediately with clean water and seek medical assistance.