For over 50 years, Astro Pak has been perfecting the chemistry and cleaning process of Passivation. Our proprietary chemistry, UltraPass® is a chemical treatment for stainless steel and other metals that enhances the ability of the treated surfaces to resist corrosion. This passive layer, which is sometimes called the passive film, is responsible for providing corrosion resistance at the surface of the metal. It is a very thin layer of highly stable metal atoms that do not easily corrode or rust.

In addition to our expertise in circulating chemistry through facility equipment, tanks and distribution systems, we also have a Gel Passivation process to address surface discoloration, spot rouging, HAZ of welds, or corrosion on any  exterior surfaces.

We provide expertise in delivering chemical cleaning services to installed systems: pre-operational, pre-commissioning of new construction, post modification, or for maintenance and shut-downs. We also offer passivation with nitric acid and other chemicals when needed. In addition, Astro Pak can process piping, fittings, vessels or other types of equipment in one of our shops located nationwide.

Astro Pak routinely responds to emergency outages for critical utilities, systems and equipment. When our job is completed, you will receive cGMP documentation packages for your systems and equipment maintenance records.

Systems & Equipment Experience

  • Process and Storage Vessels and Tanks
  • Product and Distribution Piping
  • Water for Injection (WFI) Tanks and Stills
  • Bioreactors, Fermenters, Lyophilizes
  • Clean Steam Generators and Clean Steam Systems
  • Sterilizers and Autoclaves
  • Reverse Osmosis, DI, Pure Water
  • Clean in Place (CIP)
  • Boilers
  • Heat Exchangers
  • Tubing and Hoses
  • Spools, Flanges, Gaskets
  • Valves (Relief, Ball, Butterfly, Needle, Gate)
  • Gauges (Pressure, Flow meter, Hydraulic, Cryogenic)
  • Fittings, Fasteners
  • Components and Hardware
  • Transducers and Sensors
  • Any stainless steel parts, equipment or systems


  • ASTM A380
  • ASTM A967
  • ASME BPE 2012 Bioprocessing Equipment
  • SEMATECH Passivation requirements
  • AMS 2700
  • ASTM F86
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