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Aluminum Anodizing – TYPE 2

We meet tight tolerances using precision control systems to achieve accurate coating thickness of aluminum anodized parts. Our services include (MIL-A-8265) Type II and III, Class 1 and 2 at our state-of-the-art facility in Minnesota.

The most common aluminum anodizing creates a coating thickness of up to 1mil. We seal dyed components, which increases corrosion resistance and reduces fading.

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Regular Nadcap reviews and audits ensure compliance with AC7004 requirements for the aircraft, space, and defense industries.

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Post-Anodizing Dying

We apply colored dyes after aluminum anodizing. The parts undergo sealing to reduce color fading.

Colors shown are for general reference only. Other colors may be available upon request.



  • Corrosion resistance
  • Dielectric properties
  • Aesthetics
  • Better bonding
  • Non-contaminating (for medical instrumentation, etc.)
  • Masking ability

HardCoat Anodizing – TYPE 3

Our Type III hardcoat results in a coating up to 2 mils thick for greater durability. We meet tight tolerances for hard coat anodizing using our unique control systems to achieve accurate coating thickness of aluminum anodized parts. Our services include dying options.

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Yes. There are a few options when it comes to Anodize Masking such as Laser Marking, tapes, custom caps, and masking moldings.

See masking benefits here

Aluminum anodizing is a controlled electrochemical process that increases the thickness of the oxide layers that naturally exist on aluminum surfaces, improving corrosion resistance.

Arrow Finishing offers standard (MIL-PRF-8625 Type II) at our state-of-the-art facility in Blaine, Minnesota. We also provide hard coat anodizing (MIL-PRF-8625 Type III).

Type II is used for a wide range of applications ranging from computers to aerospace and has several advantages, including:

  • Corrosion resistance
  • Dielectric properties
  • Aesthetics
  • Better bonding
  • Non-contaminating (medical instrumentation, etc.)
  • Type II
    •  standard anodized aluminum has a coating up to 1 mil thick and is sealed to seal in the dye and close the pores after the anodizing process for improved corrosion resistance. It is the most common form of aluminum anodizing and is available in dyed and non-dyed options.
  • Type III 
    • Hard Coat Anodized Aluminum is a thicker, more durable coating up to 2 mils thick. It is also available in non-dyed and dyed options. For the best wear resistance and when adhesion is required on a non-dyed component, it is typically not sealed.

When anodizing aluminum parts with tight dimensions, it is important to understand that the coating will affect the final dimensions. In general, 50% of an anodized coating will penetrate the material’s surface, and 50% of the coating builds up on the surface. But, the change in final dimensions is determined by the thickness of the coating.

Class I coatings have a mil thickness of 0.7 (18 microns) or greater for aluminum anodizing. Class II coatings have a minimum mil thickness of 0.4 (10 microns). Class I coating is a high-performance anodic finish used primarily for exterior building products and other products that must withstand continuous outdoor exposure.

Arrow offers these popular colors:

  • Blue
  • Green
  • Purple
  • Gold
  • Orange
  • Olive drab green
  • Red
  • Gray
  • Black

We can produce custom colors upon request.


AC7108 REV I – NADCAP Audit Criteria for Chemical Processing

  • AC7108 Anodize; Hard Anodize and Sulfuric Anodize (Not for Metal Bond) – AC7108/8 must also be selected
  • AC7108 Chromate (non-hexavalent)
  • AC7108 Passivation
  • AC7108 Electropolish
  • AC7108 Standalone Cleaning
  • AC7108 Descaling
  • AC7108 Solution Analysis & Testing – AC7108/4 must also be selected
  • General Cleaning & Pre-Cleaning
  • Alkaline Cleaning
  • Chemical Cleaning
  • Titanium Cleaning
  • Emulsion Cleaning
  • Semi-Aqueous Cleaning
  • Solvent Cleaning
  • Ovens for Thermal Treatments – Heat Processing; Part Dying
  • Stripping of Coatings
  • Inorganic Coatings
  • Other Stripping

AC7108/4 REV C – NADCAP Audit Criteria for Solution Analysis and Testing in Support of Chemical Processing to AC7108

  • Solution Analysis (In Support of AC7108)
  • Testing Performed Internally (In Support of the Chemical Process Accreditation)
  • B05 – Salt Spray Testing (In Support of Chemical Process Accreditation)
  • B06 – Water Immersion / Humidity Testing (In Support of AC7108)
  • B09 – Taber Wear Testing (In Support of AC7108)
  • B10 – Adhesion Testing (In Support of AC7108)
  • B13 – Coating Weight Testing(In Support of AC7108)
  • B 14 – Conductivity Testing (In Support of AC7108)
  • B15 – Resistivity Testing (In Support of AC7108)
  • B16 – Coating Thickness Measurement (In Support of AC7108)
  • B23 – Other Testing (In Support of AC7108)

AC7108/8 – NADCAP Audit Criteria for Anodizing (Not for Metal Bond)

  • Anodized Aluminum, Hard Anodize
  • Anodize Aluminum, Sulfuric Acid
  • Dye
  • Seal

AC7108/11 – NADCAP Audit Criteria for Conversion Coating

  • Aluminum, Non-Hexavalent Chrome Alternatives

AC7108/12 REV A – NADCAP Audit Criteria for Standalone Cleaning, Descaling, Passivation, and Electropolishing

  • Passivation
  • Nickle Acetate
  • Nickle fluoride
  • Hot Water


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