The (often downloaded as the ASTM G7 PDF ) is the standard practice for the natural weathering of nonmetallic materials, such as plastics, coatings, and polymers. Formally titled the Standard Practice for Natural Weathering of Materials , this protocol provides the blueprint for direct outdoor exposure testing to evaluate how materials degrade under real-world environmental stresses. Core Purpose and Scope
The primary goal of ASTM G7 is to define commercial and customary practices for exposing materials directly to sunlight and the atmosphere. astm g7 pdf
: Unlike ASTM G24, which covers testing behind glass, G7 focuses on materials in direct contact with the elements. The (often downloaded as the ASTM G7 PDF
Inspect specimens at intervals of 30, 60, 90 days, etc. Remove any dirt gently with distilled water. Document changes using digital photography under standardized lighting. : Unlike ASTM G24, which covers testing behind