Corten, electro-colour and structured finishes for the building envelope

When a window system is installed, its aluminium structure enters into direct relationship with the building facade. From that point, the external finish is no longer a decorative choice: it becomes a constructive element that participates in the composition of the envelope, amplifying or tempering its character, engaging with light and with the surrounding materials. Selecting an aluminium finish with the same attention given to a cladding material is part of responsible design practice.

The PURASISTEMI aluminium finish range offers answers for very different contexts and sensibilities: from the raw materiality of Corten, to the refined depth of electro-colour, to structured surfaces that bring tactility and visual complexity to the external face of the system. Each finish is designed to integrate within the project rather than impose itself upon it.

Corten 360: evolving matter

Corten is one of the most iconic finishes in contemporary architecture. It evokes oxidation, time, presence — a dialogue with material that becomes even more intense when it meets the geometric precision of a slender profile. In the PURASISTEMI range, the Corten 360 finish brings this aesthetic to the aluminium structure, capturing the visual quality of weathering steel without its structural and maintenance implications.

The result is a window system that sits naturally alongside facades in brick, exposed concrete, natural stone or oxidised metal sheet, amplifying the material character of the envelope. Corten 360 works particularly well in projects where the window must actively participate in the facade composition, rather than resolving simply into a glazed void.

Electro-colour: depth and chromatic precision

Electro-colour finishes are the most widely specified option in the premium segment. The controlled anodising process that produces electro-colour creates surfaces of exceptional chromatic stability, with a visual depth that distinguishes them clearly from powder coating. The colour is not deposited on the surface: it is integral to the aluminium layer itself, with a durability that performs well under atmospheric exposure.

Five electro-colour finishes are available in the PURASISTEMI range, covering a spectrum from warm, bronzed tones to cooler industrial greys. The possibility of combining these finishes with different interior cover tonalities — in natural wood or lacquered surfaces — allows the construction of sophisticated bicolour solutions, where the exterior responds to the facade and the interior engages with the living environment.

Structured finishes and Grigio Micaceo

Structured finishes introduce a tactile dimension to the envelope. The surface is not smooth but worked, with a micro-texture that captures light differently according to angle of observation. This visual quality is particularly effective on slender profiles: the surface structure brings complexity to an element that, by its nature, tends towards formal reduction.

Grigio Micaceo is among the most requested structured finishes: a grey with subtle metallic reflections that evokes natural stone, integrating with ease into a wide range of architectural contexts — from contemporary new-build to prestigious renovation work. Like Corten 360 and the electro-colour options, Grigio Micaceo can be paired with different interior covers, building a chromatic system that adapts to the complexity of each project.

RAL customisation as a design resource

Beyond the standard range, PURASISTEMI aluminium finishes are available in any tone from the full RAL palette. This capability is a valuable resource in bespoke projects, where the window system must meet precise chromatic specifications established during architectural or interior design. This is not an additional personalisation service but a structural characteristic of the system: the ability to respond to specific requirements without compromising finish quality or the coherence of the final result.

In an architecture increasingly attentive to the relationship between material, surface and light, envelope finishes are an integral part of the design conversation. PURASISTEMI approaches this dimension with a range that holds together technical rigour and compositional freedom. Explore the available aluminium finishes at purasistemi.com.