Powder Coating Grades: AAMA 2603, 2604 and 2605

AAMA 2603, 2604 and 2605 are three grades of one idea: a coating on aluminum is left outdoors in South Florida and measured, and the higher the number, the longer the exposure and the stricter the pass marks. They are voluntary specifications for organic coatings on aluminum extrusions and panels, now published by FGIA (the Fenestration and Glazing Industry Alliance, which took over AAMA's standards). Powder coating is an organic coating, so the same grades are used to specify powder-coated aluminum planters and panels.

The three grades in plain words

• AAMA 2603, the entry grade: one year of South Florida exposure, with basic limits on colour change and chalking. It suits interiors and sheltered outdoor spots. Standard polyester powders commonly meet it.
• AAMA 2604, high performance: five years of exposure, tighter limits on colour change, chalking and gloss loss, and stricter humidity and salt-spray tests. Super-durable polyester powders are commonly qualified to it, and it is a frequent choice for exterior architectural aluminum.
• AAMA 2605, superior performance: ten years of exposure, the strictest limits on colour change, chalking, gloss retention and film erosion, and the longest humidity and salt-spray tests. Powders that meet it are usually fluoropolymer based. It is named where appearance has to hold for a long time or recoating is hard: coastal sites, high-rise facades, curtain wall.

The exact test methods and limits are set in each edition of the specification, so read the edition your project names.

Test years are not service life

One, five and ten years are the length of an exposure test, not how long a finish will last on your site and not a warranty. A panel coated to AAMA 2605 can still fail early if the metal was badly cleaned before coating, the powder was under-cured, or salt and water sit against it. A warranty is a separate written promise with its own term, exclusions and claim steps; ours is on the warranty page.

A coating is a system

The powder is only one layer of the result. Performance also depends on:

• cleaning and pretreatment of the aluminum before coating;
• film thickness and a full oven cure;
• edges, welds, drain holes and inside corners, where coatings are thinnest;
• handling, packing and installation damage;
• the site: sun, salt, irrigation water, fertilizer and standing water.

Which grade for planters and panels?

Match the grade to the exposure and to how long the owner needs the colour to hold:

• Sheltered courtyards, atria and covered patios: an AAMA 2603-level coating may be enough.
• Typical exterior commercial sites: AAMA 2604 is the usual middle ground.
• Coastal, high-exposure or facade-matched work: ask about AAMA 2605, and expect a higher price and a narrower colour range.

Some colours, metallics and textures are made only at certain grades, so settle the colour and the grade together.

Our planters and panels

We do not assign a coating grade by product category or by photo. The coating grade for your project is confirmed on the quote, together with the finish and colour. Stock planters come in Semi-Gloss Black and Semi-Gloss White; made-to-order planters add Fine-Texture Black, Textured Silver Vein and Custom RAL colour. If your specification names AAMA 2604 or 2605, include that section with your enquiry: Send your plans.

What to ask for when a specification names a grade

1. The standard and edition, for example AAMA 2605 and its year.
2. The coating product: manufacturer, product line and colour code, with its current data sheet.
3. Evidence for that product: test results or a qualification showing the named product meets the grade.
4. The applicator, and any approval the coating manufacturer requires for its warranty.
5. Pretreatment and cure: the process used and how it is checked.
6. A colour standard: a physical sample or reference both sides agree on.
7. Warranty terms in writing: term, what is covered, exclusions and who stands behind it.

Comparing quotes fairly

When two quotes describe finishes differently, line them up: named product, grade, pretreatment, colour, texture, samples, touch-up method and warranty. A cheaper finish may leave out a step that another quote includes, and a pricier one proves nothing without the documents.

To price a coated planter or panel for your site: Get a project quote.