What post-processing method is used to improve the chemical resistance of SLS printed parts?

The post-processing method commonly used to improve the chemical resistance of SLS (Selective Laser Sintering) printed parts is infiltration. Infiltration involves filling the porous structure of the SLS part with a secondary material, typically a resin, epoxy, or even a metal. This process seals the surface and internal voids, preventing chemicals from penetrating the part and degrading the base material. The choice of infiltrant depends on the desired chemical resistance properties and the specific application. For example, epoxy infiltration can significantly improve resistance to solvents and acids, while metal infiltration can enhance resistance to high temperatures and corrosive environments. Before infiltration, the SLS part typically undergoes cleaning to remove any loose powder. The infiltration process itself can involve vacuum impregnation or pressure impregnation to ensure the infiltrant thoroughly penetrates the part. After infiltration, a curing or solidification step is often required to harden the infiltrant and create a durable, chemically resistant barrier.