technical case study
The Visual Science of Stainless Steel in Architecture
Key Factors That Determine the Visual Appearance of Stainless Steel 1. Surface Texture / Roughness (Ra, Rz, Rq) Surface roughness is one of the primary determinants of appearance because it controls how light interacts with the metal. Smooth surfaces result in higher reflectivity and a brighter appearance. Rougher surfaces diffuse reflected light and create a matte effect. The reflectivity and overall appearance of stainless steel are directly linked to surface texture. Roughness metrics such as Ra, Rz, and Rq describe the height and distribution of microscopic peaks and valleys. Even surfaces with the same Ra value can look different due to variations in the spacing and shape of surface features.Surface finish influences far more than just visual appeal. It significantly affects: • Corrosion resistance - Smoother surfaces are more resistant to corrosion due to fewer imperfections where contaminants and moisture can accumulate.
Stainless steel is widely used in architecture for its durability, corrosion resistance, and modern aesthetic. Yet its visual appearance often causes confusion and frustration. End users are frequently surprised by how different the same stainless steel surface can look under varying lighting conditions. The contrast between direct sunlight and indoor incandescent lighting, can significantly alter perceived colour, brightness, and uniformity. This becomes particularly problematic in large outdoor installations such as cladding, signage, and facades, where adjacent panels may appear mismatched despite being manufactured to the same specification. As a result, Sassda regularly receives enquiries in this regard. To understand and manage these concerns, it is important to recognise the key factors that influence the visual appearance of stainless steel.
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Issue 1 – 2026
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