ACP Thickness Guide for Difference Applications

When specifying Aluminium Composite Panels (ACP) for a project, thickness is often overlooked as a minor detail, with more attention typically given to colour, finish, or overall design intent.

In reality, however, thickness plays a critical role in determining a panel’s structural performance, durability, and long-term safety. It directly affects factors such as rigidity, resistance to wind load, impact strength, and the panel’s ability to maintain its form over time without warping or deflection.

This becomes especially important when comparing signage, roofing and façade applications, where each condition exposes the material to different types of stress. By carefully considering thickness at the specification stage, designers can ensure that the selected ACP system not only meets aesthetic expectations but also performs reliably throughout the building’s lifecycle.

Why Thickness Matters

Although the difference between a 3mm and 4mm ACP panel may appear minimal, it significantly affects the panel’s rigidity, impact resistance, and ability to withstand environmental stress. In practical terms, a thicker panel offers better structural stability, reduced flexing, and improved resistance to wind loads and external pressure.

For architects and designers, understanding these differences is essential when selecting the right product for the right application.

ACP for Signage and Roofing: Lightweight and Practical

For signage applications, a 3mm ACP such as the UNI-R series offers a balanced combination of lightweight properties and sufficient rigidity, making it ideal for shopfront signage, billboards, and interior branding elements.

Its lighter weight also allows for easier installation on various support structures without adding excessive load.

At the same time, the panel maintains adequate durability for everyday exposure, making it a practical and cost-effective choice for indoor, outdoor and semi-outdoor signage solutions.

For roofing applications, such as canopies, residential porch roofs, covered walkways, or decorative roof features, lightweight materials are generally preferred.

The UNI-S series, with a thickness of 4mm, is specifically designed for such applications. It offers sufficient strength while maintaining ease of installation and reduced structural load. A light panel helps simplify support structures and improves overall installation efficiency.

In many cases, 4mm panels with thinner aluminium skins (e.g., 0.4mm) are already adequate for roofing, depending on design intent and span requirements. For projects where aesthetics is a priority, designers may also explore decorative finishes such as woodgrain from MBond WS-MB Wood series, which combines visual appeal with functional performance.

ACP for Facade: Strength and Stability

Façade applications, particularly for mid- to high-rise buildings, require a higher level of structural integrity. Buildings above five storeys or exceeding 18 metres in height are exposed to stronger wind pressure, thermal expansion, and continuous environmental stress.

This is where panel thickness becomes critical. Thinner panels are more prone to:

Oil canning (visible waviness on flat surfaces)
Deflection under wind load
Reduced fixing strength at anchoring points
Long-term deformation due to temperature fluctuations

To address these challenges, façade systems typically require ACP panels with a minimum thickness of 4mm, along with thicker aluminium skins (commonly 0.5mm).

The MBC series is engineered for such applications. With a 4mm panel thickness and stronger aluminium composition, it provides the rigidity and durability required for vertical installations on high-rise structures.

Material Composition: A Key Differentiator

Beyond thickness, the aluminium alloy used in the panel also affects performance.

UNI-R, UNI-S and Wood series.

Uses A1100 aluminium alloy, which offers good workability and is suitable for roofing applications where extreme structural strength is not the primary concern.

MBC series.

Uses A3003 aluminium alloy, known for higher strength and better resistance to mechanical stress, making it more suitable for façade systems.

This difference ensures that each product is optimised for its intended application rather than being a one-size-fits-all solution.

Compliance with Malaysian Standards

In Malaysia, façade design must comply with strict safety and quality requirements set by regulatory bodies like SIRIM, BOMBA, and CIDB. For buildings exceeding 18 metres, ACP panels must typically meet minimum thickness and fire performance standards.

A 4mm ACP panel with 0.5mm aluminium skin is widely recognised as the baseline requirement for façade applications, aligning with industry expectations and compliance guidelines.

The MBC series is designed to meet these requirements and is further enhanced with PVDF (Polyvinylidene Fluoride) coating. This high-performance coating improves colour retention and protects the surface from:

Cracking
Chalking
Colour fading due to UV exposure

Conclusion

Selecting the correct ACP thickness is not just a technical decision. It directly impacts the safety, durability, and visual quality of a project.

For roofing, lighter panels like the 4mm with 0.4mm aluminium skin from UNI-S series provide a practical and efficient solution. For façades, especially in high-rise developments, 4mm panels with 0.5mm aluminium skin from the MBC series deliver the necessary strength and long-term performance.

MBond is a leading ACP manufacturer in Malaysia, meeting key safety and quality standards, including SIRIM MS2571:2017, BS8414 fire performance testing, Bomba compliance, and CIDB PPS certification.

With proper design planning, appropriate material selection, and professional installation, both roofing and façade systems can maintain their structural integrity and aesthetic appeal for years to come.

- MBond Manufacturer Sdn Bhd

Photo Credited to Unsplash

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