The AAMA specifications grade coatings on aluminum windows, doors and curtain wall. 2603 is the basic tier with one year of Florida exposure, 2604 requires five years with limits on color change, chalking and gloss loss, and 2605 requires ten years and is usually met by fluoropolymer systems. Superdurable polyesters are the usual way to reach 2604 in powder.
Bid says 2605 on the curtain wall but AAMA 2604 is fine for the louvers, so we can run superdurable there.
Also heard as
- 2604
Related terms
Superdurable
Describing polyester powders built with weather-stable acids that hold gloss and color several times longer outdoors.
Chalking
A powdery residue on a weathered finish where sunlight has broken down the resin at the surface.
Delta E
A single number for how far a color is from its standard, read by a spectrophotometer.
Gloss
How mirror-like a finish is, read with a gloss meter at a fixed angle, usually 60 degrees.