Stainless steel extrusions are used for these types of profiles due to the materials’ wear and corrosion resistance. In addition to being essentially rustproof, some grades of stainless steel are also immune to acids and/or other highly corrosive compounds, even in high concentrations.
Stainless steel, in general, is a very low maintenance material. It can be repeatedly steam-cleaned or sterilized without degrading, and does not require painting or other surface finishes. Stainless steel exhibits high electrical resistance, as well as low thermal conductivity.
However, due to its hardness, stainless steel is not easy to extrude. This dictates that wall thickness must be greater than those of extruded shapes made from most other alloys; it also necessitates larger corner radii in the product design.