Coating specifications are where facade budgets quietly drift. Two suppliers quote “PVDF, AAMA compliant” and deliver films that behave very differently after eight years of UV. The standards behind those claims — AAMA 2605 in North America, EN 12206 in Europe — are similar in intent and different in detail. Knowing where they diverge is what lets you compare quotations properly.
Two standards, two regions, one coating family
Both standards apply to factory-applied organic coatings on aluminium extrusions and panels, and both are used to qualify the same product family: 70% PVDF (KYNAR 500 or HYLAR 5000) liquid coatings, usually applied as a primer plus one or two colour coats.
The difference is where they are used and what they assume about climate. AAMA 2605 grew out of the Florida exposure tradition and is written around severe UV and humidity. EN 12206 is the European harmonised test standard under the Construction Products Regulation, written to support CE marking and Declaration of Performance.
What AAMA 2605 tests
AAMA 2605 is the most demanding of the three AAMA coating specifications (2603, 2604, 2605). It requires ten years of South Florida exposure — 45° south, direct sun, high humidity — plus a list of laboratory tests on the same production sample.
- Colour change of no more than 5 ΔE units after ten years, and no more than 2 ΔE on the control panel.
- Gloss retention of at least 50% after ten years for most colours.
- Chalk resistance rated 8 or better on a 10-point scale.
- Adhesion by dry and wet tape, plus a boiling water immersion test.
- Chemical resistance to mortar, hydrochloric acid, detergents and MEK.
- Abrasion resistance and impact resistance of the cured film.
What EN 12206 tests
EN 12206-1 covers organic coatings on aluminium for architectural applications. It defines performance classes rather than a single pass mark, so a specification has to state which class it requires — a detail that is frequently left out and quietly filled in by the supplier.
- Artificial weathering to EN ISO 16474-2 (xenon arc) with a defined gloss and colour retention threshold.
- Natural weathering exposure, with the duration set by the agreed class.
- Adhesion by cross-cut and indentation tests.
- Impact resistance by falling-weight test.
- Resistance to acid, mortar and detergents, plus humidity and salt-spray exposure.
Side-by-side comparison
The table below summarises the practical differences for a specifier. It is a simplification of two long documents, but it covers the questions that decide a facade specification.
| Topic | AAMA 2605 | EN 12206 |
|---|---|---|
| Geography | North America | Europe / CE marking |
| Structure | Single performance level | Classes chosen by the specifier |
| Weathering basis | 10 years, South Florida, 45° south | Artificial xenon-arc + natural exposure by class |
| Colour retention | ΔE ≤ 5 after 10 years | Class-dependent threshold |
| Gloss retention | ≥ 50% after 10 years | Class-dependent threshold |
| Chalking | Rating ≥ 8 | Assessed, threshold by class |
| Typical film build | 25–35 µm (2–3 coats) | 25–40 µm depending on system |
| Warranty benchmark | 20–30 years | 10–20 years, per project |
A coating can meet both standards. Most 70% PVDF systems from major resin suppliers are tested to AAMA 2605 and can be supplied with EN 12206 test data on request.
The ten-year South Florida test, explained
AAMA 2605 is unusual because a large part of its evidence is real weather rather than a laboratory lamp. Test panels are exposed at 45° to the south in Florida for ten years, then measured for colour change, gloss loss and chalking.
This is why the standard is expensive to claim honestly: nobody can shortcut ten years. Suppliers either hold historical exposure data for a specific coating system, or they do not. When a quotation says “AAMA 2605 compliant” without naming the coating system and the test report, that is the question to ask next.
Which specification should you use?
- North American projects: specify AAMA 2605 and name the resin percentage (70% PVDF) and the coating manufacturer.
- European projects: specify EN 12206-1 and state the class, plus the film build and the colour retention requirement.
- Gulf and Middle East projects: AAMA 2605 is the usual reference, but add salt-spray and a higher film build; UV and salt are both severe.
- Australian projects: AAMA 2605 is commonly referenced alongside AS 3715 for metal finishes; confirm the warranty wording with the coater.
Writing the coating clause
A specification that cannot be misread names four things: the standard, the resin content, the film build, and the colour tolerance after a stated exposure period. Anything less leaves room for a 50% PVDF “equivalent” to be offered at a lower price.
- Name the standard and the edition, not just the number.
- Require 70% PVDF resin by weight and name the resin supplier.
- State the film build in microns, measured on the finished part.
- Require a spray-out panel for colour approval before production.
- Require the batch test certificate with each shipment.
Summary
AAMA 2605 and EN 12206 are both credible ways to buy a coating, but they answer different questions: one is a single high bar proven over ten years of real weather, the other is a class-based European system that supports CE marking. Specify the one your market recognises, then close the gaps — resin content, film build, colour tolerance — that neither standard fills in for you.