Incoloy 825 Blind Flanges
Incoloy 825 Blind Flanges are solid disk-like fittings, manufactured by Zeron Fastners, used to
completely seal off the ends of piping, valves, or pressure vessel openings. The primary function is
to isolate sections of a pipeline for maintenance, future extension, or for pressure testing the
system. The material, Incoloy 825 (UNS N08825), is a high-performance nickel-iron-chromium alloy with
additions of molybdenum, copper, and titanium. This exceptional composition provides outstanding
immunity to stress-corrosion cracking in chloride-rich environments and superior resistance to
reducing acids (like sulfuric and phosphoric acid). The Blind Flange is secured by bolting it to an
existing flange face, requiring high-strength bolting and a robust gasket seal to ensure absolute
isolation in severe service environments.
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