This AATCC test method (TM 192-2009) outlines procedures for determining the weather resistance of textile materials, including fibers, yarns, and fabrics. It utilizes sunshine-arc lamp exposure under two main options: with wetting (Option A) to simulate rain and humidity, or without wetting (Option B) for dry exposure. The method evaluates degradation, such as color change or strength loss, by exposing test specimens alongside a comparison standard under controlled conditions. While designed for accelerated testing, the document stresses that the correlation between this test and actual in-use exposure must be mathematically determined and agreed upon by contractual parties. Key sections cover specimen preparation, apparatus calibration, detailed exposure procedures, and evaluation criteria based on retained strength or colorfastness.

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