1 Scope

Summary of Topics:

This new edition of ANSI/UL 746E dated September 14, 2020 includes the following changes:

• Clarify Stabilization Period Requirement• Update Characterization of Materials for IR Testing• Update Table 8.1 and Table 9.1 and Clause 9.3 to Show Actual Number of Samples Required for Flex Strength Testing• Clarify Requirements in Section 9.9• Change the Title and Text for Section 11• Relocate Sections 19 and 20 Flex Films and Metal Base Laminates to New Sections 12 and 13• Clarify Vulcanized Fibre Testing and Sample Requirements in Table 15.1• Clarify Testing and Sample Requirements for Filament Wound Tubing in Table 17.1• Clarify the Conformal Coating Sample Construction Requirements in Section 22.2.1• Clarify the Conformal Coating Sample Requirements in Tables 22.1, Section 22.5, and Section 22.6.1.5• Clarify Microsection Analysis Process Based on Changes to the Referenced IPC Test Method• Add Alternate Test Methods for Halogen Content Testing• Standardized Assembly Soldering Process Profiles• Clarify Clause 7.20 Reference to Epoxy Resin• Align PWB and PCB Definitions with Industry Use