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UL 746B Ed. 5-2018 (2026)

Standard for Polymeric Materials - Long Term Property Evaluations - Published Date: July 28, 2026

This revision of ANSI/UL 746B dated July 28, 2026 includes the following changes in requirements: – Revisions to Enhance the Clarity of Long-Term Thermal Aging Protocols so they are in Alignment with Tables 9.1 and 9.2 of UL 746A: 20.1.1, 20.2.1, 20.2.1A (new), 20.2.2, 20.2.2A (new), 20.2.3 – 20.2.7, 20.2.9 – 20.2.11, 20.2.13 – 20.2.14, 20.3.2, and Table 20.1. 1 Scope 1.1 These requirements cover long-term test procedures to be used for the evaluation of materials used for parts intended for specific applications in end products. 1.2 Together with the Standards mentioned in Supplementary Test Procedures, Section 3, these investigations provide data with respect to the physical, electrical, flammability, thermal, and other properties of the materials under consideration and are intended to provide guidance for the material manufacturer, the molder, the end-product manufacturer, safety engineers, and other interested parties.

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