Aluminum Composite Material

Aluminum Composite Panels for Rigid Signs

Aluminum composite material (ACM) uses thin aluminum faces bonded to a solid core. It provides a flat, lightweight panel for printed signs, wall panels, construction signs, displays, and other rigid graphics.

Material

Aluminum-Faced Composite

Common Thicknesses

3 mm · 6 mm

Environment

Indoor & Outdoor

Graphics

Direct Print · Vinyl · Mounting

Overview

What Is Aluminum Composite Material?

ACM combines aluminum faces with a core to create a rigid panel that weighs less than a comparable solid aluminum sheet.

DIBOND, one of the best-known ACM products in signage, uses two pre-painted .012-inch aluminum sheets bonded to a polyethylene core. The smooth faces work well for direct print, mounted graphics, and vinyl, while the panel can also be routed and formed for certain applications.

Building & Wall Panels Flat rigid panels for exterior and interior sign faces.

Construction Signs Useful where a stiff printed panel is preferred over corrugated plastic.

Display Graphics Good for mounted prints, branded panels, exhibits, and presentation graphics.

Custom Shapes Can be routed and cut for project-specific profiles.

Thickness

3 mm vs 6 mm ACM

Panel thickness affects stiffness and edge depth. The correct choice depends on panel size, support, mounting method, and exposure.

3 mm

Common Sign Gauge
A standard starting point for many flat printed and mounted sign panels.

Often suitable for wall signs, construction panels, displays, and medium-size rigid graphics.

6 mm

Thicker Panel
Provides more panel depth and stiffness.

Useful when the project size, mounting, or design calls for a thicker ACM panel.

Thickness alone does not determine performance.

Panel dimensions, support spacing, wind exposure, mounting hardware, and the specific ACM product all matter.

Material Comparison

ACM vs Solid Aluminum

ACM and solid aluminum can both carry printed or applied graphics, but their construction changes how they behave.

ACM

Solid Aluminum

Construction
Thin aluminum faces bonded to a core.

Construction
Metal throughout.

Weight
DIBOND is about half the weight of solid aluminum sheet.

Weight
Heavier at comparable panel size.

Common Fit
Larger flat printed panels and rigid graphics.

Common Fit
Parking, property, safety, and true metal-panel applications.

Printing & Fabrication

How ACM Can Be Printed and Fabricated

The coated faces on sign-grade ACM are made for graphics. Depending on the project, the panel can receive direct print, screen print, mounted prints, or vinyl graphics.

Direct Print Smooth coated faces are well suited to compatible flatbed printing.

Vinyl Graphics Printed or cut vinyl can be applied to the finished panel.

Routing & Cutting ACM can be routed and cut into custom shapes.

Forming Some ACM products can be routed and returned or formed for dimensional effects.

Signs vs Cladding

Sign Panels Are Not Building Cladding

The aluminum composite used for signs and the panels used to clad whole buildings look alike, but they are bought and approved very differently. Facade cladding falls under building code fire rules and is specified with fire retardant cores by architects and engineers.

A printed ACM sign mounted to a storefront or a tenant panel on a pylon is a sign, and it goes through the town’s sign permit rather than a cladding specification. If a project starts to look like covering a wall rather than putting a sign on it, that is the point to bring the architect in.

Mounting

How ACM Signs Are Mounted

ACM is light enough that most wall signs need no heavy structure, but the panel still moves with temperature and catches wind. The fixing method is chosen for the wall and the size of the panel.

Screws or Rivets Through oversized holes so the panel can expand. Simple and secure on brick, block and framing.

Standoffs Metal studs hold the panel off the wall for an office or lobby look.

Hidden Rails Aluminum rails or cleats on the back let a large panel hang flat with no visible fixings.

Post Brackets For property and directional signs on round or square posts.

Pan Signs

Routed and Folded ACM Panels

Because the core is thin, a V shaped groove routed in the back lets the aluminum skin fold cleanly into a return. That turns a flat sheet into a tray with finished edges, sometimes called a pan sign, without welding a metal box.

It is a neat way to give a storefront panel some depth and hide its edges. See our Dibond signs page for finished panel options.

Flat panel or folded tray?

A flat panel is the economical choice for most wall signs. Folding adds depth and a finished edge, which is worth it when the sign is seen up close or from the side.

Choosing the Material

When ACM Is the Better Choice

Consider another material when

FAQs

Aluminum Composite Questions

Is aluminum composite the same as Dibond?

Dibond is one well known brand of aluminum composite material. The term ACM covers the whole category of panels with thin aluminum skins bonded to a plastic core.

How long does an ACM sign last outdoors?

Many years. The panel resists corrosion and stays flat, so the printed graphics usually wear before the panel does.

Is 3 mm or 6 mm ACM better?

3 mm suits most wall signs and medium panels. 6 mm adds stiffness for larger panels or designs that need a thicker visible edge.

Can ACM be used for building facades?

Sign grade ACM is made for signs. Panels that clad a building are specified separately under building code fire rules and usually need fire retardant cores.

Why choose ACM over solid aluminum?

It is lighter and stays flatter at larger sizes, which makes big printed signs easier to handle and mount. Solid aluminum is still the standard for parking and regulatory signs.

On This Guide

Quick Facts

Material

Aluminum-Faced Composite

Common Thickness

3 mm · 6 mm

Environment

Indoor & Outdoor

Common Graphics

Vinyl · Print · Paint · Reflective

Common Uses

Wall Signs · Construction · Displays

Related Materials

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