ASTM G113 is the ASTM standard terminology for natural and artificial weathering tests of nonmetallic materials. It provides consistent language for describing exposure methods, test conditions, and related terms used in weathering evaluation. This matters because clear terminology helps laboratories, manufacturers, and specifiers communicate accurately when comparing durability data, setting test programs, or reviewing material performance after exposure to outdoor or simulated weathering environments.

ASTM G113 standard overview

The official title, Standard Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials, shows that ASTM G113 is a terminology document rather than a test method. Its purpose is to define the language used around weathering testing so users can apply terms consistently across technical documents and quality systems. In practice, that supports clearer interpretation of results, better alignment between parties, and more reliable reporting when evaluating how nonmetallic materials respond to environmental exposure.

Where is ASTM G113 used?

ASTM G113 is commonly used wherever weathering test terminology must be understood and applied consistently. It is relevant in laboratories, product development settings, and procurement or compliance workflows that involve natural or artificial weathering evaluation of nonmetallic materials. The standard is especially useful when teams prepare test reports, compare exposure data, or specify weathering-related requirements for materials, coatings, plastics, and other nonmetallic products.

Practical importance of ASTM G113

In practice, ASTM G113 helps reduce ambiguity in weathering-related communication and supports consistent use of technical terms across testing and documentation. That can improve comparability between laboratories, strengthen specification writing, and support more dependable product evaluation. For organizations managing compliance, quality control, or purchasing decisions, the standard helps ensure that weathering terminology is interpreted in a uniform way, lowering the risk of miscommunication and rework.

• Terminology for weathering test language
• Natural and artificial exposure context
• Nonmetallic material evaluation
• Consistent reporting and communication
• Support for technical and quality workflows