The IPC-4202B document provides comprehensive data to help users more easily determine both material capability and compatibility for flexible base dielectric materials for the manufacture of flexible printed boards. It includes flexible base material specification sheets that have been updated with the newest properties for the specification material types. It establishes the most current classification system, qualification and quality conformance requirements, including high-frequency dielectric properties. A new specification sheet for an adhesive fluorocarbon film has been added as it became available to the marketplace. Number of pages 23. Released March 2017. Supersedes: IPC-4202A – April 2010

IPC-4202B, Flexible Base Dielectrics for Use in Flexible Printed Boards

The IPC-4202B standard establishes the classification system, the qualification and quality conformance requirements for flexible base dielectric materials to be used for the fabrication of flexible printed boards. This specification supersedes IPC-4202 which, in turn superseded IPC-FC-231C and the requirements herein meet or exceed the requirements for Class 3 in this superseded document. Note that conformance to Class 3 met or exceeded conformance to Classes 1 and 2. IPC-4202 no longer utilizes the 3-class system. Classification System The system described in 1.1.1 through identifies flexible base dielectrics.

Nonspecific Designation A nonspecific designation is intended for use by designers on master drawings to designate their material choice. At the end of this standard is a series of material specification sheets identified by specification sheet numbers. Each sheet outlines engineering and performance data for a flexible base dielectric, indicating base material type and method of reinforcement.

Example of nonspecific designation: IPC-4202/1, Where ‘‘1’’ refers to the specification sheet detailing unsupported polyimide flexible base dielectrics.

If further material specification details (such as dielectric thickness) are required, they should be highlighted in cross sectional views or notes on the master drawing.

Specific Designation The specific designation should be in the form shown in the following example, and is intended for use on material purchase orders by fabricators (see 6.1). The specific designation should not be used by designers on master drawings to indicate their material selection. Master drawings shall indicate the material design by designers on master drawings to indicate their material selection, as the designation is lengthy and requires fabricator level knowledge in making the detailed selections.

Preview the IPC-4202B table of contents .pdf file.

Developed by the Flexible Circuits Base Materials Subcommittee (D-13) of the Flexible Circuits Committee (D-10) of IPC. Users of this publication are encouraged to participate in the development of future revisions.