Type III Hardcoat Anodizing

 FortWayneAnodizing Title Glow

FortWayneAnodizing Type III IMG


Hardcoat anodizing forms a thick (.001" to .003") aluminum oxide coating. This layer becomes an integral part of the metal. For example, a .002" coating will add .001" above the surface and will penetrate .001" into the metal, resulting in an extremely hard inert coating that significantly enhances the hardness and durability of aluminum.

The precise application of the Hardcoat process provides a uniform surface, even to complex parts, while significantly improving the properties of aluminum.

  • Corrosion Resistance …passes 1000 HR 5% salt spray test
  • Electrical Insulation …equivalent to glass or porcelain
  • Prevents Galvanic Reaction …can be used with steel, copper, brass, etc.
  • Hardness …C60-C70 Rockwell
  • High Operating Temperatures …up to 500°C
  • Durability …10 times greater than unanodized Aluminum
  • Excellent Lubricity …Hardcoated parts may run against each other without lubrication in many applications.
  • Conductivity …Voltage breakdown of 2000 to 3000 Volts/mil

FortWayneAnodizing Type III Chart IMG


 FortWayneAnodizing Title Glow

Process Description Usage Finish Properties
Type III Industrial Hardcoat Anodizing Electro Chemical Process that interacts with the metal surface forming a new, extremely hard metal surface. May be masked to manage coverage.
  • Aluminum
  • Aluminum Alloy
Color Spectrum:
  • Tan to Very Dark Grey to Black
Production Line Certification Maximum Part Size
Type III Industrial Hardcoat
  • MIL-A-8625, Type III Class I & II
  • AMS-2468, AMS 2469
  • MIL-STD-171b, 7.5
  • MIL-A-63576-A
  • (Hard Anodizing w/PTFE) Teflon®
  • Length: 13'6"
  • Width: 30"
  • Height: 48"
  • Weight: 1000#
Process Type Type III-Industrial Hardcoat
Process Method Electro Chemical &Temp Controlled
Primary Advantages
  • Corrosion Resistance
  • High Wear Resistance
  • Highly Machinable
  • Uniform Coverage
  • Non-Conductive
  • Extremely Hard Surface
  • Thermally Neutral (500° Operating Temperatures)
  • Very High Lubricity
  • May be combined with MetaBrite for Colorization
Fort Wayne Anodizing Production Capacity 3- Fully Automated Production Lines
Max Part Size 13'6 X 30 X 48
Max Weight 3,000 lbs.
Corrosive Resistance Excellent
Electrical Property Non-Conductive (1)
Galvanic Reaction None
Hardness Hard (500 to 530 VPN) (2)
Heat Resistance Operating Temp to 500°C
Lubricity High (Teflon® Coating)
Surface Resistance High (C-60/C-70 Rockwell)
Thermal Property Low Conductivity
Thickness .0025 Max. 50/50 Penetration
Uniformity Highly Uniform to Complex Shapes
Wear Resistance High (3)
Workability High
Tolerance Specs. +/- .0002î @ .002î
Uncolored Appearance Grey to Black

(1) Voltage breakdown of 2000 to 3000 Volts/mil
(2) This rating refers to the weight required for a Diamond Indenter to produce an indentation in the coating
(3) 10 X higher than unanodized Aluminum Alloy


Corrosive Resistance: The inert nature on an anodized coating provides excellent corrosion resistance. Hardcoat will pass the 1,000 hour 5% salt spray test (@ 2mil) (ASTM B 117). Corrosion resistance of more than 1,000 hours is available with additional sealing operations on Hardcoated parts.

Electrical Properties: Aluminum Oxide is an excellent electrical insulator. Hardcoated aluminum /alloys can be used as electrical insulators. With its high temperature properties it maintains a similar insulating factor as glass and porcelain. (2000V-3000V per mil)

Prevents Galvanic Reaction: Hardcoat aluminum /alloy can be used with a wide variety of other metals such as steel, brass or bronze due to insulation properties.

Hardness Properties: C60-C70 Rockwell

Heat Resistance: The inert nature of the Hardcoat shows no effect after short exposure to temperatures as high as 2000°C and permits operating temperatures of 500°C. (It is recommended that parts subject to open flame have greater thicknesses.)

Lubricity: In many instances a Hardcoated part can run against another Hardcoated part without lubrication. Ice does not form on Hardcoated surfaces. Hardcoated surfaces impregnated with Teflon® (PTFE) have an even lower coefficient of friction.

Thermal Properties: Hard anodized coatings have very low thermal conductivity and expansion. Ideal for internal combustion engine pistons and when dyed black, excellent for use in solar collectors with no need for additional paint.

Uniformity: The Hardcoat process follows the contour of the part with a uniform build up allowing for very close tolerances and effective coating on unusually shaped parts.

Wear Resistance: 10X greater than unanodized aluminum. Standard Tabor Testing has shown Hardcoat aluminum in 2X greater than Cyanide Case Hardened Steel.

Workability: Parts may be machined, ground, dyed, painted or sealed. High tolerances may be achieved with alloy consistency.

Color and Finish: Natural finish is determined by the Aluminum alloy and range from tan to dark grey or black. Your cast part may also be given our MetaBrite® treatment for a brighter more polished appearance



Cutting edge Hardcoat Anodizing technology, sophisticated engineering and an experienced team of technicians assure you get the best hardcoat results for your part. Our fully automated Hardcoat line allows for both short runs and production runs as well as the capacity to Hardcoat parts as long as 13'6” and up to 5,000 pounds. Our equipment and anodizing team allows us to meet each Hardcoat job with highest degree of accuracy and quality. Here is why…

Fully Automated System

  • Highest Yield: Significantly reduces component handling with the lowest error rates.
  • Fastest Turnaround: Ready for just-in-time delivery schedules. Your specifications are pre-programmed, saved and double-checked for accuracy before production begins.
  • Highest Consistency: FWA can recall your order to meet your exact specifications, next week or next year!
  • Most Flexibility to Meet Your Needs: Totally independent lines, each with their own rectifier and temperature control system. We can run multiple processes simultaneously. Meeting your specifications and delivery schedules every time.
  • Highest Precision: FWA specializes in restrictive anodizing. Parts can be masked by applying “wet” masking material, plastic or rubber plugs and tape. This process allows you to specify exactly what area of your part is to be anodized.
  • Most Reliable: State of the art systems, operated by a quality team, result in high quality production; efficient and cost effective.