Aluminum powder used for pigments refers to aluminum powder whose particles are scaly, coated with surface treatment agent and suitable for making pigments. Aluminum slurry is a mixture of pigment aluminum powder and solvent. Its use and characteristics are roughly the same as aluminum powder. Because it is easy to use, its output and consumption are larger. Aluminum powder is made of aluminum with light color and high metallic luster. Its surface is smooth and clean. When objects are coated with paint containing aluminum powder, its surface is silvery and bright, which is the characteristic of aluminum powder reflecting light.

Aluminum is a silver-gray metal with a relative density of 2.55 and a purity of 99.5%. The melting point of aluminum is 685 degrees, the boiling point is 2065 degrees, and the melting heat absorption is 323kJ/g. Aluminum is reductive, easy to oxidize, and exothermic in the oxidation process. During rapid oxidation, the heat release per gram is 15.5kJg. Aluminum is a ductile metal and easy to process. The oxide film on the surface of aluminum is transparent and has good chemical stability.