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Photographic Activity Test (PAT) is anISO standard test detailed in ISO 18916:2025 (E), updated in 2025.[1] Previous versions of the standard were numbered ISO 14523:1999(E).[1]
The test evaluates materials for archival quality and their use inphotographic enclosures. Many different types of materials can be tested including:paper, boards,plastic,adhesives,pens,stickers,labels,paints andinks. The test involves incubating samples and detectors in a high-temperature, high-humidityaccelerated aging environment.
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