AluOldCopper is an architectural anodizing finish developed by Alumet to offer the visual qualities of aged copper within the stable and low-maintenance framework of anodized aluminium. The tone is a muted, warm brown with subtle metallic variation, designed to complement both contemporary and traditional material palettes.

This finish is achieved through Alumet’s electrolytic anodizing process, which forms an oxide layer integrated into the aluminium surface. Colour is introduced using metal salt deposition within the anodic layer, eliminating the need for organic dyes or surface coatings. The result is a highly UV-stable, weather-resistant surface with uniform colouring across panels, while preserving the depth and texture inherent to the anodizing process.

Material and Technical Properties

• Base material: Architectural-grade aluminium, suitable for exterior use
• Finish type: Electrolytically coloured anodizing (non-coated)
• Surface properties: Matte–satin, low-gloss, light-diffusing
• Corrosion resistance: Excellent (ISO 7599, class 20–25 μm depending on specification)
• UV stability: High; inorganic pigmentation avoids fading
• Maintenance: Non-reactive, requires only basic cleaning
• Fire classification: Non-combustible material (Euroclass A1, aluminium substrate)

The finish is resistant to mechanical wear, atmospheric corrosion, and does not develop surface patina over time. In contrast to natural copper, AluOldCopper does not oxidize, discolour adjacent materials, or change appearance due to environmental exposure.

Application and Specification Context
AluOldCopper is intended for architectural projects where a reference to copper aesthetics is desired, but where long-term colour stability, lightweight construction, and reduced maintenance requirements are critical. The finish is commonly specified for:

• Façade cladding and rainscreen systems
• Sunscreens, brise-soleils, and louvres
• Interior wall and ceiling panels
• Architectural detailing and trim elements

Its neutral, warm tone allows it to be combined effectively with materials such as stone, glass, and untreated wood, particularly in contexts where natural material compatibility is a design priority.

Sustainability
AluOldCopper is produced using a chromium-free anodizing process. Aluminium substrates can be sourced with high recycled content upon request. The product is fully recyclable at end-of-life, supporting circular material use in architectural projects