AAMA 2603 vs 2604 vs 2605 :Which Aluminium Window Finish Should Buyers Choose

When buying aluminium windows for an international construction project, buyers often specify the color first.

For example:

Black aluminium windows.

Or:

Grey powder-coated aluminium windows.

But color is only one part of the surface-finish specification.

For professional B2B procurement, buyers may also need to consider:

· Coating type

· Performance specification

· Pretreatment

· Exposure conditions

· Color retention

· Film integrity

· Weatherability

· Project requirements

· Warranty

This is where AAMA 2603, AAMA 2604 and AAMA 2605 can become relevant.

The three specifications define different performance levels for pigmented organic coatings applied to architectural aluminium extrusions and panels.

In 2026, the Fenestration and Glazing Industry Alliance (FGIA) released updated versions:

· AAMA 2603-26

· AAMA 2604-26

· AAMA 2605-26

FGIA describes them broadly as different levels of performance for architectural aluminium finishes.

For distributors, contractors and project buyers, the important question is not:“Which one is the best?”

It is:“Which finish specification matches the project's exposure, appearance requirements, service expectations and budget?”

What Are AAMA 2603, 2604 and 2605

AAMA 2603, 2604 and 2605 are voluntary specifications covering performance requirements and test procedures for pigmented organic coatings applied to aluminium extrusions and panels used in architectural products.

The three levels can be understood broadly as:

FGIA's 2026 update describes the three documents as a “good, better, best” category of aluminium finishes.

However, buyers should not interpret this as:

2603 = poor
2604 = good
2605 = only acceptable

That would be an oversimplification.

The appropriate specification depends on the project.

AAMA 2603 vs 2604 vs 2605: What Is the Difference

The most useful way for a buyer to understand the three specifications is to view them as different performance categories.

AAMA 2603

AAMA 2603 covers pigmented organic coatings for architectural aluminium products.

It can be considered for projects where the exposure and performance requirements are relatively moderate.

The buyer should still confirm:

· Project environment

· Expected service conditions

· Color requirements

· Maintenance expectations

· Project specification

AAMA 2603 should not simply be rejected because it is a lower performance category.

It may be appropriate for a specific project.

AAMA 2604

AAMA 2604 covers high-performance organic coatings.

It is intended for applications where greater performance is required compared with basic architectural coating specifications.

It may be considered for projects with:

· Higher exposure

· Greater weathering requirements

· Longer appearance expectations

· More demanding architectural specifications

AAMA 2605

AAMA 2605 covers superior-performing organic coatings.

It is generally considered when a project has more demanding requirements for long-term exterior performance and appearance.

Potential applications may include projects with:

· Strong UV exposure

· Demanding architectural specifications

· Long expected service life

· Higher appearance requirements

· More severe environmental exposure

However, buyers should still follow the project's actual specification rather than selecting 2605 simply because it has the highest number.

What Does “Higher Performance” Actually Mean

The difference between coating specifications is not simply about how the color looks on the day the window leaves the factory.

Architectural coatings need to maintain performance over time.

Depending on the specification, relevant performance considerations can include:

· Film integrity

· Weatherability

· Appearance

· Color retention

· Gloss retention

· Resistance to environmental exposure

This is important for international projects.

A window installed in an indoor or sheltered environment may face very different conditions from a window installed on a high-rise building in a strong-UV coastal region.

Therefore:Exposure should influence finish selection.

Does Coastal Exposure Mean You Must Use AAMA 2605

Not automatically.

This is an important point for professional content.

Coastal buildings may face:

· Salt exposure

· High humidity

· Strong UV radiation

· Wind

· Rain

· Temperature changes

These conditions can increase the importance of coating performance.

However, the correct finish specification should depend on:

· Actual exposure

· Project requirements

· Local standards

· Coating manufacturer's recommendations

· Architect specification

· Expected service conditions

· Warranty requirements

Therefore, instead of writing:

“All coastal buildings require AAMA 2605.”

A more accurate procurement statement is:Coastal and high-UV projects may justify a higher-performance coating specification, depending on the exposure and project requirements.

This is a much safer way for distributors to discuss coating standards with customers.

AAMA 2605 Is Not Simply Another Word for PVDF

This is another common misunderstanding.

Buyers sometimes assume:

AAMA 2605 = PVDF.

The relationship is more complicated.

AAMA 2603/2604/2605 describe performance specifications and test requirements for organic coatings.

“PVDF” refers to a type of coating chemistry/resin technology.

“Powder coating” refers to a coating application method and product form.

Therefore, buyers should not treat:

AAMA specification + resin chemistry + application method

as if they were exactly the same concept.

When a supplier says:

“AAMA 2605 coating”

the buyer should ask for the actual coating system and supporting documentation.

This can include:

· Coating manufacturer

· Coating product

· Resin type

· Application process

· Pretreatment

· Performance specification

· Color

· Warranty

Powder Coating vs PVDF: What Should Buyers Actually Compare

Instead of asking only:

Powder coating or PVDF?

Professional buyers should ask:

1. What coating system is being used?

Identify the actual coating product.

2. Which AAMA specification applies?

Confirm whether the coating is specified to meet:

· AAMA 2603

· AAMA 2604

· AAMA 2605

3. What environment will the window face?

Consider:

· UV

· Humidity

· Salt

· Rain

· Temperature

· Pollution

4. What appearance is required?

Confirm:

· Color

· Gloss

· Texture

· Metallic effect

· Surface appearance

5. What documentation is available?

Ask for:

· Technical data sheet

· Coating specification

· Test information

· Warranty information

This is much more useful than comparing coating names alone.

What Should Distributors Include in the Purchase Order?

A professional purchase order should not simply say:

Black powder coating.

It should be more specific.

For example:

The exact specification should be adapted to the project.

Why Color Samples Are Important

Color on a computer screen is not always an accurate representation of the finished aluminium surface.

The final appearance can be influenced by:

· Coating system

· Gloss

· Texture

· Lighting

· Aluminium substrate

· Application process

· Batch variation

For large projects, distributors should request an approved physical sample where appropriate.

The sample can become the visual reference for production.

This is especially useful for:

· Apartment projects

· Hotels

· Commercial buildings

· Large residential developments

· Projects with multiple window sizes

What About Aluminium Windows in Hot and Sunny Regions

For projects in the Middle East, Africa and other high-sun regions, buyers should pay close attention to exterior exposure.

High solar radiation can place greater demands on the coating system.

The buyer should discuss:

· UV exposure

· Color

· Gloss retention

· Surface appearance

· Project location

· Coating specification

· Warranty

However, finish selection should not be separated from the rest of the window specification.

For example, a project may require:

High-performance coating + appropriate glass + thermal break + suitable seals + correct hardware

The finish is only one part of the complete window system.

What About Coastal Aluminium Windows

Coastal exposure deserves special attention because salt and moisture can affect exterior building products.

For coastal projects, buyers should ask the supplier:

· What coating specification is proposed?

· What pretreatment is used?

· What exposure conditions are expected?

· Is the coating system suitable for the project environment?

· What maintenance is recommended?

· What warranty is available?

Do not select a coating only because another project used it.

The environmental exposure may be different.

A Practical Aluminium Finish Selection Process

For distributors, the following five-step process is simple and effective.

Step 1: Identify the project location

Determine:

· Climate

· UV exposure

· Coastal exposure

· Humidity

· Pollution

Step 2: Check the project specification

If the architect or developer has already specified an AAMA performance level, follow that requirement.

Step 3: Select the coating system

Confirm:

· Coating technology

· Resin type

· Supplier

· AAMA specification

Step 4: Approve color and surface

Confirm:

· Color

· Gloss

· Texture

· Physical sample

Step 5: Record everything

The final purchase specification should include the approved coating information.

This makes future repeat orders easier.

How Should Buyers Compare Two Aluminium Window Suppliers?

Imagine two suppliers provide these quotations.

Supplier A

Aluminium windows, black powder coating.

Supplier B

Aluminium windows, approved black architectural coating, specified performance level, approved physical color sample, coating system documented in the purchase specification.

Supplier B gives the buyer much more information.

The buyer can then ask:

· What coating is used?

· What performance specification applies?

· Who manufactures the coating?

· How is the aluminium pretreated?

· What sample was approved?

· What warranty is available?

This is the difference between buying a color and specifying a finish system.

Why Work With VIGORAWINDOWS

For overseas distributors and project buyers, aluminium window finish should be confirmed before production.

VIGORAWINDOWS supplies aluminium windows for international B2B projects and can coordinate product specifications including:

· Aluminium profile

· Window type

· Glass

· Hardware

· Surface finish

· Color

· Dimensions

· Project requirements

For larger orders, buyers should establish the approved finish and color before mass production.

This helps create a consistent product specification that can be used for future repeat orders.

The objective is not simply to choose the most expensive coating.

It is to choose a coating specification that matches the project's environment, appearance requirements, performance expectations and budget.

Frequently Asked Questions

What is AAMA 2603?

AAMA 2603 is a voluntary specification covering performance requirements and test procedures for pigmented organic coatings on aluminium extrusions and panels used in architectural products.

What is AAMA 2604?

AAMA 2604 is a voluntary specification for high-performance organic coatings on aluminium extrusions and panels.

What is AAMA 2605?

AAMA 2605 is a voluntary specification for superior-performing organic coatings on aluminium extrusions and panels.

Is AAMA 2605 always better for aluminium windows?

It represents a higher performance category, but that does not mean every project needs it. The correct specification depends on exposure, project requirements, appearance expectations and budget.

Is AAMA 2605 the same as PVDF?

No. AAMA 2605 is a performance specification, while PVDF describes a coating resin/technology. Buyers should request the complete coating system specification.