Chemical Composition Of Printing Powders

Printing powders are composed of binding resins, carbon black, charge control agents, and external additives; while black is the most common color, other colors are produced by adding various pigments. There is a wide variety of printing powders, ranging from metal powders (such as stainless steel, aluminum alloys, and titanium alloys) and polymer powders (such as nylon PA12 and TPU elastomers) to ceramic powders. Powders made from different materials exhibit vastly different performance characteristics. For instance, metal printing powders require high purity and low oxygen content to prevent the formation of pores or cracks during high-temperature laser sintering, whereas polymer printing powders prioritize thermal stability and melt flow index to suit specific printing temperature ranges. According to industry standards, industrial-grade printing powders typically require a purity level exceeding 95%, and their tap density must be controlled within a specific range (e.g., 2.0–3.5 g/cm³) to ensure stability and repeatability during the printing process.