Short answer: Yes. Aluminum composite panels (ACP or ACM) are designed to be formed into curves, angles, and complex shapes. At Wiedehopf, bending is part of our in-house manufacturing and fabrication process. We groove, bend, and finish ACM panels in our Toronto facility using precision CNC routers and specialized equipment. The finished, pre-formed panels are then delivered to installers and contractors, who simply hang them on the pre-prepared substructure.
This shop-controlled process delivers tighter tolerances, better quality, and faster installation while protecting the panel’s finish and fire-rating performance.
How Aluminum Composite Panels Are Structured
ACP consists of two thin aluminum skins bonded to a core (polyethylene, fire-retardant mineral, or A2/A1 cores). The core gives the panel its lightweight rigidity, while the aluminum skins provide strength and a beautiful finish. The way you bend the panel depends on the core type and thickness (most common: 3 mm, 4 mm, and 6 mm).
Most Common Bending Method: V-Grooving (Routing)
The fastest, cleanest, and most widely used method in professional fabrication shops is V-grooving (also called routing or milling). A specialized router bit cuts a precise V-shaped groove into the back of the panel, leaving a thin layer of core and the front aluminum skin intact. The panel is then folded along the groove.
Official ALPOLIC Milling Parameters (2026)
Each type of ALPOLIC panel has its own recommended milling geometry. Here are the exact specifications:
| Panel | b (mm) | h (mm) | Core left (mm) | Bending radius r (mm) | Milling tool |
|---|---|---|---|---|---|
| ALPOLIC™/fr | 3–4 | 0.7–0.9 | 0.2–0.4 | 2–3 | Carbide/Diamond |
| ALPOLIC™ A2 | 3–4 | 0.65–0.75 | 0.15–0.25 | 1.5–2 | Diamond |
| ALPOLIC™ A1 | 3–4 | 0.55–0.65 | 0.05–0.15 | 1.5–2 | Diamond |
Key tips from ALPOLIC:
- Always check the final bending radius after folding with a radius gauge.
- For 90° inside corners, the groove geometry must be followed precisely.
- If the bend is made in the opposite direction (e.g., inside corner), a real anodised finish may not be possible.
Other Professional Bending Methods
While V-grooving is the go-to for sharp 90° folds, other methods are used for gentler curves or specific applications:
- Press brake / folding machine – Ideal for straight, sharp bends.
- Roll bending machine – Used for large-radius curves and cylindrical shapes.
All of these processes happen in our Wiedehopf fabrication shop before the panels ever reach the job site.
Structural Performance After Bending
Properly fabricated and bent ALPOLIC panels maintain excellent bending strength and stiffness, making them suitable for exterior cladding even under high wind loads.
Key mechanical properties (ALPOLIC PE and FR cores):
At Wiedehopf, we reference these exact values during fabrication to ensure every bent panel meets or exceeds project wind-load requirements.
Why Shop Fabrication Beats On-Site Bending
- Precision equipment and climate-controlled conditions
- Consistent results across hundreds of panels
- Protection of the factory-applied finish
- Faster and safer installation for contractors
Installers receive ready-to-hang panels with all bends, returns, stiffeners, and attachment systems already complete.
Ready to Get Your Panels Fabricated & Bent?
Whether you need simple 90° returns, complex curved façades, or custom design, Wiedehopf’s in-house fabrication team can handle it. We work directly with premium ALPOLIC materials and deliver across the Greater Toronto Area and beyond.
Contact us today for a quote on your next aluminum composite panel project.
