Call 401.597.5000


Coating Description

Revolutionary aluminum Hard Coat where the anodic coating molecules are phase changed into partially crystalline structures for maximum chemical and corrosion resistance.

Process Description

Low Voltage Hard Coat Rectification using MICRALOX® Hard Coat process. Process is controlled by Current Density.

Amorphous oxide coating is partially phase changed into crystalline structures through a patent protected post process.

The coating is fully RoHS and Cytotoxic compliant.


MICRALOX® Hard Coat is used for applications where:

  • High chemical resistance is required, such as applications requiring regular cleaning with detergents. MICRALOX® can withstand hundreds of Steris, Sterrad, and Autoclave cycles. Further, MICRALOX® maintains its integrity at pH 13 for 2 hrs or pH 0.9 for 48 hours.
  • Exceptional corrosion resistance – exceeding 15,000 hours salt-water spray.
  • Acts like a noble metal between Stainless Steel and Titanium in a galvanic corrosion chart – up to 300 hours in accelerated testing – equivalent to 8 months in normal sea life cycle. - Dielectric barrier usually > 1000 Volt DC.
  • For applications requiring a hard but clear coating to prevent darkening and/or where printing and dying vibrant colors are required.
  • For SANFORD PRINT – embedded printing in the oxide.

Applicable Certifications

  • Mil-A-8625 Type III, Class 1 & 2
  • MIL-STD 171 7.5.1
  • MIL-STD 171 7.5.2
  • AMS 2468 & 2469
  • BS 5599
  • BS EN 2536
  • ASTM B 580 Type A
  • BAC 5821
  • PS 13208
  • PS 13201
  • PS 13021.1
  • HP 4-79

Note that each specification has specific processing requirements.

For more information go to www.MICRALOX®.com

Video go to

Press: http://www.MICRALOX®.com/news/newspress-releases/


  • Can MICRALOX® Aluminum Hard Coat Be Colored?
    • MICRALOX® Aluminum Hard Coat have excellent colorability and dyability equal to clear anodizing.
    • Allows for all colors and color shades and maximum design benefits.
  • What Seals Can Be Used for MICRALOX® Aluminum Hard Coat?
    • MICRALOX® is a sealed anodic coating using proprietary methods.
  • What Is the Coating Thickness for MICRALOX® Aluminum Hard Coat?
    • 2 Mils / 50 μm is the recommended coating thickness for maximum chemical resistance. Note that the coating both penetrates the surface and builds from the surface in roughly 50% proportions.
  • What Is the Penetration vs. Build Up for MICRALOX® Aluminum Hard Coat?
    • Half of the coating is penetration. Half is Build Up.
  • What Are the Applicable Coating Thickness Tolerances for MICRALOX®Aluminum Hard Coat?
    • While an engineered solution can provide tighter tolerances, the general rule of thumb is + / - 20% coating thickness or 0.4 mils on a .002” coating.
  • How Are Parts Racked for MICRALOX® Aluminum Hard Coat?
    • The rectification normally requires > 30 Amps per square foot current density, but due to AC component cross section of rack should be increased by 50%. This in turn requires a rack that can hold the current density, and hold the part securely to prevent arching. Typically conventional hard coat will result in a more visible rack mark than rack marks after Type II anodizing, where half the current density is used.
  • What is the maximum coating thickness for MICRALOX® Aluminum High Voltage Hard Coat?
    • MICRALOX® Hard Coats allow for coating thickness up to 3 mils due to elimination of polarization at the cathode and anode and the ensuing build up of oxygen and hydrogen.
  • Can Aluminum Cast Materials receive MICRALOX®?
    • No. The uniformity of the anodic coating on a cast part is generally not sufficient to produce a MICRALOX® coating.
  • Can parts processed using MICRALOX® Hard Coat process receive a high gloss or highly matt finish?
    • Primary factors resulting in a high gloss or high matt finish for a hard coat are not directly related to the aluminum hard coat process. The mechanical finish (mechanical polishing or mechanical bead sanding / blasting) determines macro smoothness or roughness of the substrate. The hard coat anodizing process has secondary factors such as chemical polishing steps and or surface etching. The only factor directly related to the hard coat anodizing process is coating thickness where imperfections in the substrate are “grown” and are thus dependent on coating thickness. To specify gloss and/or matt finish, please conduct an engineering review prior to parts being run.
  • Are MICRALOX® coatings as hard as Type III Aluminum Hard Coat ?
    • Coating hardness is similar for dyed and hydro-thermally sealed parts using either process.
One Shorr Court Woonsocket, RI 02895
Tel - (401) 597-5000 • Fax - (401) 597-5485
Website Design by Grant Marketing