UL 796F:2021 pdf download.STANDARD FOR SAFETY-Flexible Materials Interconnect Constructions.
1.1 These requirements apply to flexible material printed wiring board constructions (FMIC’s) for use as components in flexible, flex-to-install, rigid, and multilayer rigid-flex composite applications with and without stiffener and adhesive materials in devices or appliances.
1.2 Together with the Standards mentioned in the Supplementary Test Procedures, Section 3, these requirements provide data with respect to the physical, electrical, flammability, thermal, and other properties of the FMIC under consideration and are intended to provide guidance to the fabricator, end product manufacturer, safety engineers and other interested parties.
1.3 Compliance with these requirements does not indicate the product is acceptable for use as a component of an end product without further investigation.
1.4 The singlelayer and multilayer flexible, flex-to-install, and multilayer rigid-flex composite constructions addressed by these requirements consist of conductors affixed to base material, with mid- board interconnections, and cover materials.
1.5 The suitability of additional stiffener and adhesive materials, not evaluated in accordance with Stiffener and adhesive (external bonding) materials, 8.10, the Stiffener bond strength test, 12.12, and Flammability tests, 12.15, are subject to the applicable end-use product construction and performance requirements. See Additional stiffener and adhesive (external bonding) materials, 13.12, for marking requirements for FMIC’s provided with additional stiffener and adhesive materials not investigated.
1.6 The requirements for rigid printed wiring boards are in the Standard for Printed Wiring Boards, UL 796.
2 Units of Measurement
2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or
approximate information.
3 Supplementary Test Procedures
3.1 These requirements are intended to be used in conjunction with the following requirements or standards:
a) The Standard for Polymeric Materials — Short Term Property Evaluations, UL 746A, the Standard for Polymeric Materials — Long Term Property Evaluations, UL 746B, the Standard for Polymeric Materials — Industrial Laminates, Filament Wound Tubing, Vulcanized Fibre, and Materials Used in Printed Wiring Boards, UL 746E, and the Standard for Polymeric Materials — Flexible Dielectric Film Materials for Use in Printed Wiring Boards and Flexible Materials Interconnect Constructions, UL 746F, contain programs for investigating polymeric materials and industrial laminates.
b) The Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, UL 94, contains methods for evaluating the flammability of polymeric materials that are intended to be used in electrical equipment.
C) The Standard for Printed Wiring Boards, UL 796, covers the minimum performance requirements for rigid printed wiring boards.UL 796F pdf download.