Electropolishing & Mechanical Polishing

In addition to Astro Pak’s heritage in offering of Passivation & Precision chemical cleaning services, we offer Mechanical Polishing and Electropolishing. Our Electropolishing service provides optimal Ra (Roughness Average) finishes to your equipment, vessels, tanks and systems. The result is a microscopically flat, smooth and featureless surface which enhances cleanability and appearance of stainless steel.

Astro Pak uses proprietary and custom tooling to ensure proper contact with stainless steel surfaces, which result in uniform surface conditioning and adherence with ASME BPE standards.

The ability to provide Mechanical Polish and Electropolish services onsite enables Astro Pak to help customers with high-purity applications to maintain or improve upon the surface finish conditions on the interior or exterior of vessels with minimal downtime.  Moreover, this allows for critical surface areas to attain Optimal Ra finish to meet or exceed requirements. Expert polishing technicians produce microscopically flat and smooth electropolished surfaces that eliminate the appearance of grain from sanding operations. The Ra measure is confirmed using microscopic and profilometry testing as well as micro finish inspections provide verification of procedure adherence and process quality.

Our mobilization resources make immediate response possible to assist our customers with remediation efforts involving vessels large or small. Whether damaged by chemical attack or from mechanical (impact) incident, our specially trained, Confined Space Entry (CSE) crews can work 24/7 to get process vessels back up and running. We also provide mechanical polishing and electropolishing services in our shops located nationwide.

Immediate response for component, hardware, vessel remediation with minimum downtime is a specialty to our service group. Spot mechanical and electropolishing of welds, damaged areas and alteration zones can be performed. We also provide cGMP documentation packages for equipment maintenance records.

Let our experts resolve your surface treatment needs. As leaders in numerous market segments that require High Purity and Critical Precision Cleaning, several of our employees sit on committees and boards in such organizations as ISPE, ASME/BPE and others.

Trust the Experts

For nearly 60 years, Astro Pak has been perfecting the chemistry and cleaning process of Passivation. Our proprietary chemistry is a chemical treatment that enhances the ability of the treated surfaces to resist corrosion.

Astro Pak also delivers chemical cleaning & passivation services to installed systems: pre-operational, pre-commissioning of new construction, post modification, or for maintenance during shut-downs. Whether it is UltraPass®, nitric acid, or other chemistries, we process piping, fittings, vessels and other types of equipment. We also performs Gel Passivation to address surface discoloration, spot rouge, HAZ of welds, or corrosion on exterior surfaces.

We routinely respond to emergency situations for critical utilities, systems and equipment. When our job is complete, you will receive cGMP compliant documentation packages for your systems and equipment maintenance records.

Astro Pak commits to providing customers with the level of excellence they expect and deserve by:

  • Rapid Response
  • Highly Trained Personnel delivering superior consulting services
  • State of the Art Equipment Nationwide
  • Advanced Chemistry & Process Technology
  • Superior Documentation (Meeting cGMP Requirements)

Let our experienced and credentialed team of chemists, engineers, and other professionals on staff EXCEED your pipeline pigging expectations.

System & Equipment Experience

  • Process vessels and reactors from 2 liter to 30,000 gallon+
  • Fermenters
  • WFI, Buffer and Media prep and hold vessels
  • Autoclaves
  • Laboratory fixtures and equipment
  • Vessels, V-blenders and Powder Blenders
  • Stainless Tubing
  • All types of components such as Filling & Conveyor hardware
  • Pumps, spray balls, dip tubes, agitators and a host of other peripheral equipment
  • Heat exchangers
  • OEM and repairs
  •  Accela-Cota tablet coating machines
  • Fluid bed dryers


  • ASME BPE (BioProcessing Equipment Standard)
  • ASTM B912 Passivation of Stainless steel using Electropolishing
  • EFS 1 – 4 (Electropolish Finish Standards 1- 4)
  • ISO 15730
  • SEMI F19-0304 Specification for the Finish of the Wetted Surfaces of Electropolished 316L Stainless Steel Components
  • AMAT 0250-13605

Markets Served

  • Powder & Tablet Manufacturing
  • Marine
  • Nuclear
  • Petrochemical


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