Base materials

For wetted parts, stainless steel SS316 is the most common material. Depending on the aggressivity of the mixed media, 904, duplex grades or titanium are often applied. The surface roughness of wetted parts varies from cold/ hot rolled steel, pickling, sand or glass blasting up to Ra 0.2 to 0.8 grinded or polished depending of cleanability requirements. Normally, carbon steel and cast iron are applied for non-wetted parts, but in special conditions stainless steel can be applied.

Materials are selected based on corrosion, the abrasion of the mixed media and the reactor gas space. Mechanical properties in relation to the required agitation forces also play a role when selecting materials. Wetted parts have been FDA approved for compliance with current GMP