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| ISO 175 | |
|---|---|
| Title | ISO 175 |
| Status | Published |
| Domain | Materials testing |
| Organization | International Organization for Standardization |
| First published | 1970s |
ISO 175
ISO 175 is an international standard specifying procedures for assessing the effects of artificial weathering on plastics, polymers, and related materials. It provides controlled methods to expose specimens to simulated environmental agents and to evaluate changes in appearance, physical properties, and performance. The standard is referenced in technical literature, regulatory frameworks, and industry protocols across multiple sectors.
ISO 175 defines artificial weathering test methods used by laboratories, manufacturers, and regulators to simulate exposure to ultraviolet radiation, heat, moisture, and pollutants for materials such as plastics and elastomers. Organizations and institutions including the International Organization for Standardization, the European Committee for Standardization, the American Society for Testing and Materials, and national metrology institutes reference these methods when comparing durability, lifetime prediction, and failure analysis. Laboratories in industrial hubs like Stuttgart, Sheffield, Detroit, and Tokyo commonly implement ISO 175 alongside complementary protocols from bodies such as the International Electrotechnical Commission, the Food and Drug Administration, and the United Nations Economic Commission for Europe.
The standard aims to provide reproducible test conditions so that manufacturers, certification bodies, and research centres can compare materials and formulations under accelerated environmental stress. Stakeholders include producers of consumer goods, automotive suppliers, aerospace contractors, and construction firms, which often coordinate with agencies such as the European Commission, the United States Environmental Protection Agency, and national standards agencies to ensure compliance and to support product declarations. Academic institutions and research laboratories at universities like MIT, Imperial College London, Kyoto University, and ETH Zurich use the standard in materials research and polymer degradation studies.
ISO 175 specifies apparatus configurations, irradiation sources, cycle definitions, specimen preparation, and evaluation techniques. Test chambers may use xenon arc, fluorescent UV lamps, or other controlled light sources similar to those described by the National Institute of Standards and Technology, the National Physical Laboratory, and the Deutsches Institut für Normung. Procedures reference measurement instruments and calibration practices from organizations such as the International Bureau of Weights and Measures, the International Electrotechnical Commission, and the Organisation for Economic Co-operation and Development for chemical testing and interlaboratory comparisons.
The standard includes criteria for classifying material performance after exposure, providing rating scales for changes in color, gloss, cracking, and mechanical properties. Classification schemes are used by certification entities like Underwriters Laboratories, TÜV Rheinland, and Lloyd's Register for product approval and by procurement authorities in municipal governments and multinational corporations. Ratings inform service-life modeling performed by engineering consultancies and research centres involved with the World Bank, the European Investment Bank, and national infrastructure agencies.
ISO 175 applies to a broad range of thermoplastics, thermosets, elastomers, and composite materials used in sectors such as automotive, aerospace, electronics, packaging, and construction. Manufacturers like Bosch, Siemens, Toyota, Boeing, and Samsung integrate these tests into quality assurance, while suppliers and trade associations such as PlasticsEurope, the Society of Automotive Engineers, and the International Air Transport Association reference results for material selection and certification. Laboratories accredited by bodies such as the International Laboratory Accreditation Cooperation, the American Association for Laboratory Accreditation, and national accreditation schemes perform testing to ensure traceability and comparability.
Since its inception, the standard has evolved through revisions reflecting advances in exposure apparatus, photochemical understanding, and consensus work among national member bodies including Standards Australia, the British Standards Institution, the Bureau of Indian Standards, and the Standards Council of Canada. Working groups comprising experts from industry firms, universities, and research institutes such as CNRS, Fraunhofer Society, and the National Research Council Canada have contributed updates. Revisions have aligned ISO 175 with parallel standards and technical reports from the International Electrotechnical Commission, the ASTM Committee on Plastics, and the European Committee for Standardization.
ISO 175 is harmonized with related international and regional norms and is cited in conformity assessment schemes administered by the European Commission, the World Trade Organization notifications, and bilateral technical cooperation agreements. Adoption is widespread across regulatory regimes, procurement specifications, and voluntary certification programmes managed by organizations like the International Chamber of Commerce, the World Economic Forum, and regional standards bodies including ASEAN, MERCOSUR, and the African Union. The standard remains a key reference for interlaboratory studies, round-robin testing coordinated by national metrology institutes, and harmonization efforts among global standards organizations.
Category:Standards