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According to metal powder supplier, aluminum is silver metal, the relative mass is 26.98, the relative density is 2.55, the melting point of 99.5% aluminum is 685?, boiling point is 2065?, melting latent heat is 323kj/g, aluminum also with reducibility, easily oxidized, release heat in the oxidation process. When the oxidation sharply, every per gram release 15.5kj/g, aluminum is malleable metal, easy processing. The oxide film on the aluminum surface is transparent and has good chemical stability. The pigment used aluminum powder is referred to those particles are scaly, the surface coated treatment agent and suitable for used as pigment. Aluminum powder paste is a mixture of pigment aluminum powder and solvent, its uses and characteristics substantially the same as aluminum powder, because it is simple to use, so the production and use is more. Aluminum powder pigments compared with other pigments, also has its characteristic, performance in the following aspects: Scaly covering characteristics, aluminum particles are scaly shape, its chip size and thickness ratio is about (40:1) - (100:1), aluminum powder dispersed in the carrier having the characteristics of in parallel with the substrate, a large number of aluminum powder interconnected, each particles filled with other to form a continuous cover, cover the substrate, and reflect the light outside coating, which is the unique hiding power of aluminum. The hiding power size of aluminum depends on the surface area, that is the radius thickness ratio. Aluminum during the grinding process is extended, the radius thickness ratio increasing, hiding power also increased. Aluminum powder’s shielding characteristics, dispersed in the carrier aluminum powder occurs floating movement, the movement result is always make itself parallel to the substrate which coated by carrier, form a continuous aluminum layer, and this aluminum layer on the carrier membrane layers are arranged in parallel. Pores between the aluminum layers are staggered, cut off the capillary pores of carrier film, the external water, gas can not reach the substrate through the pores, which is the good physical shielding characterized of aluminum. The optical properties of aluminum powder, aluminum powder made by a light color, high-gloss aluminum metal, its surface is smooth, can reflect 60%-90% of visible light, ultraviolet and infrared light, with the coatings containing aluminum powder to coat objects, the surface is silver white light, this is the characteristic of aluminum reflected light. The "two-color effect" feature of aluminum powder, aluminum powder due to have the characteristics of having a metallic luster and parallel to the coated objects, in the containing transparent pigment carriers, the gloss and color depth of aluminum powder occurs light and color changes with the incident angle of incident light and the viewing angle changes, this feature is called "two-color effect". Aluminum powder within the coating film are arranged at different levels, when the incident light is irradiated to the aluminum flake layers, because of through different thickness of the coating film have different weakened, the reflection brightness of the light is clearly different. When light rip into transparent pigments and aluminum powder coating inside, the incident light through the pigment particles become colored light, and then through the different levels of aluminum powder reflected, it will occurs tones and metallic light changes, the incident light and perspective angular position from the vertical gradually occurs movement, the light through different particles number pigment and different particle sizes aluminum powder, the reflected light hue and the metal light also have endless changes. This characteristic of aluminum powder has been widely used in coatings inside for hammer paint or metallic paint. Aluminum powder’s floating characteristics, one of the major types of pigments aluminum powder and aluminum powder paste is floating type, it is characterized by scaly floating on the film surface. Source:http://www.mhcmp.com
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