The typical specimen mounting for many standard tests involves a 45° south-facing angle with a solid plywood backing.
The standard is the definitive Standard Practice for Natural Weathering of Materials , providing critical framework parameters for the direct outdoor atmospheric environmental exposure testing of nonmetallic materials . Rather than relying entirely on simulated laboratory weathering equipment like fluorescent UV or xenon arc chambers, this standard outlines the exact protocols needed to evaluate how real-world variables—such as solar ultraviolet (UV) radiation, ambient temperature fluxes, relative humidity, and moisture cycles—degrade polymers, plastics, paints, and coatings over time.
Meeting ASTM G7 standards is often a contractual requirement in industries like automotive, aerospace, building construction, and marine manufacturing. Key Methodologies Described in ASTM G7
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Specimens should be prepared according to the material manufacturer's instructions. Factors to consider include:
This is a common point of confusion. The key difference lies in the : The typical specimen mounting for many standard tests
Standard Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials
This standard practice provides guidelines for outdoor exposure testing of paints, coatings, and cured products to evaluate their durability and performance under various environmental conditions. The practice covers the selection of test sites, specimen preparation, exposure procedures, and evaluation of test results.
The precision and bias of the test results should be evaluated by repeating the test on multiple specimens and analyzing the data statistically. Meeting ASTM G7 standards is often a contractual
To achieve consistent data, ASTM G7 categorizes exposure methods based on the intended real-world application of the material. 1. Exposure Angles and Orientation
The material behind the test specimen changes its thermal profile:
To legally execute this test or design compliant hardware, engineers must reference the official standard document.
The structural integrity of the exposure racks is heavily regulated. Racks must be constructed from inert materials—typically anodized aluminum or stainless steel—to prevent corrosion from staining or chemically altering the test specimens. 3. Exposure Angles and Orientation