904-L vs. 316-L Stainless: Which is Better for WFI?

Selection of construction materials is critical in the design, validation and operation of High Purity Water Systems. The materials should not be reactive, additive or absorptive, and they must be compatible with control methods (e.g. cleaning, sanitizing and passivating) and the chemicals used in those methods. Author Dan Klees compares 904-L with 316-L stainless steel construction materials and offers his conclusions.