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84th Edition, January 1984

Complete Document

Qualification and Performance of Electrical Insulating Compound for Printed Board Assemblies

Includes all amendments and changes through Reaffirmation Notice , April 1990

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Description / Abstract:

This standard has been designed and constructed with the intent of obtaining the maximum information about the confidence in the electrical insulating compound (conformal coating) material under evaluation with a minimum of test redundancy. This standard covers
  • The evaluation and conformance of conformal coating material properties (Table 1, Column A).
  • The qualification of the conformal coating using the standard IPC-B-25 printed wiring test board system (Table 1, Column B).
  • The qualification assessment of the conformal coating using the IPC-B-25 pattern with a production board substrate (Table 1, Column C).
  • The quality conformance of the conformal coating using a production printed board assembly or a test board/coupon that has seen the same production processing as the assembly (Table l , Column D).

For the purpose of this specification the term conformal coating is used herein when referring to a type of protective coating for use on printed-board assemblies. The coating is intended to provide protection from moisture, contamination and provide electrical insulation; not as a sole source of mechanical support. The term standard board system is used when referring to the industry (military accepted electrical standard IPC-B-25 printed board) coated with the conformal coating and the term production printed board assembly is used when referring to a production printed board assembly coated with the conformai coating.

Purpose. This standard enables a vendor to qualify his conformal coating and express the qualifications it possesses when tested on a standard board system according to the test methods and conditions contained in this document. It also enables a printed board assembler and/or user to jointly qualify a production board assembly and monitor quality conformance using the test methods and conditions contained in this document based on end use and environment reliability requirements.