Unlike accelerated laboratory weathering, which relies on artificial lamps, natural weathering uses the complex, synergistic interaction of real sunshine, moisture, and temperature cycles. Scope and Limitations
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Standard Practice for Conducting Atmospheric Corrosion Tests on Metals (ASTM G7 is not for metals). astm g7 pdf
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A manufacturer of architectural coatings uses ASTM G7 to compare three formulations. Specimens are mounted on a 45° south-facing rack in Florida (high UV, humidity) and Arizona (high UV, dry heat). Every 3 months, color change (ASTM D2244) and gloss loss (ASTM D523) are measured. Results guide formulation improvements before market launch. The official PDF of is a copyrighted document
Natural solar radiation includes a dynamic mix of ultraviolet (UV), visible, and infrared (IR) light that changes throughout the day and seasons.
The ASTM G7 standard is not just an academic exercise. It is used daily in industry to certify products. Specimens are mounted on a 45° south-facing rack
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G7/G7M Standard Practice for Natural Weathering of Materials
ASTM G7 is a standard practice that details the procedures to be followed for the direct exposure of materials to the environment. It is often referred to as a natural weathering test because it involves placing material samples on outdoor exposure racks, which are typically tilted at an angle toward the equator to maximize sunlight exposure.
ASTM G7 is a testing standard managed by ASTM International. It provides guidelines for exposing nonmetallic materials—such as plastics, paints, coatings, and rubber—to natural outdoor elements.