Textiles; tests for colour fastness; part B03: colour fastness to weathering: outdoor exposure

This document establishes a technical framework for evaluating the color fastness of textile materials when exposed to natural outdoor climatic conditions. The procedure focuses on specific environmental factors such as solar radiation, temperature fluctuations, moisture, and atmospheric pollutants that commonly occur in open-air settings. By subjecting dyed or printed fabric samples to controlled exposure periods, the method provides a systematic approach to assess potential fading, color change, or degradation of the material's appearance. The test conditions are designed to simulate real-world environmental stresses without artificial acceleration, ensuring the results reflect actual service performance under outdoor usage scenarios. Various specimen mounting techniques and exposure durations are defined to accommodate different fabric types and intended applications. The outcome of this evaluation helps manufacturers and suppliers understand how their products maintain color integrity over time when used in exterior environments. This assessment is critical for industries requiring durable textile solutions where visual quality must be preserved despite prolonged exposure to natural elements.