Platinum powder is in the form of particles and spheres. The solid density is 1.0 to 4.0 g/cm3. The average particle size is 1.1 to 1.7 μm. The specific surface area is 5 to 15 m 2 /g.
Platinum is a chemical element. Its single substance is commonly called platinum. It belongs to the platinum element. Its chemical symbol Pt is one of the precious metals. Softer, with good ductility, thermal conductivity and electrical conductivity. Sponge platinum is a gray sponge-like substance with a large specific surface area and strong absorption capacity for gases (especially hydrogen, oxygen and carbon monoxide). Platinum powdered platinum is black and absorbs a large amount of hydrogen.
Platinum is chemically inert and stable in air and humid environments. When heated below 450 °C, it forms a platinum dioxide film on the surface and reacts with sulfur, phosphorus and halogen at high temperatures.
Platinum is insoluble in hydrochloric acid, sulfuric acid, nitric acid and alkaline solutions, but soluble in aqua regia and molten alkali. Dissolving sponge platinum with aqua regia to obtain chloroplatinic acid solution, adjusting acidity, adding dispersant, heating and stirring, adding reducing agent (hydrazine hydrate, etc.), standing cooling, washing and drying to obtain ultrafine platinum with an average particle size of 0.5 μm. powder. Conductive paste for making single or multi-layer hybrid integrated circuits with high reliability and high resolution.