by Tom Minnon, LEED® AP, CDT, Eastern Region Sales Manager for Tubelite Inc.
Specifying Anodized Finishes
The Aluminum Association has developed a system of designation for anodized finishes on aluminum. Specific finishes of the various types are designated by a letter followed by a two-digit numeral. Each designation may be combined into a single composite designation to identify a sequence of operations covering all of the important steps leading to a final complex finish.
Almost all finishes used on aluminum may be subdivided into three major categories: mechanical finishes, chemical finishes and coatings.
Descriptions of the most commonly utilized finishes are as follows:
* Mechanical: (M)
M10 – Unspecified as fabricated
* Chemical (C)
C21- Fine matte (eco-friendly etch process)
C22 – Medium matte etch (caustic etch process)
* Anodic Coatings (A)
Architectural Class II (0.4-0.7 mils thick)
A31 – Clear
A32 – Integral Color
A34 – Electrolytically deposited color (two-step)
Architectural Class I (0.7 mil and thicker anodic coating)
A41 – Clear
A44 – Electrolytically deposited color (two-step)
All composite designations are preceded by the letters “AA” to identify them as an Aluminum Association designation.
* Example 1: Aluminum Association (plus) Mechanical Finish (plus) Chemical Etching (plus) Anodic Coating translates to:
Class II Clear Anodized Finish AA‑M10‑C21‑A31 complying with AAMA 611
* Example 2: An Architectural Class I medium bronze [ Read More… ]