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J-STD-004

Revision B, December 2008

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Requirements for Soldering Fluxes

Includes all amendments and changes through Amendment 1, November 2011


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Description / Abstract:

This standard prescribes general requirements for the classification and characterization of fluxes for high quality solder interconnections. This standard may be used for quality control and procurement purposes.

Purpose The purpose of this standard is to classify and characterize tin/lead and lead-free soldering flux materials for use in electronic metallurgical interconnections for printed circuit board assembly. Soldering flux materials include the following: liquid flux, paste flux, solder paste, solder cream as well as flux-coated and flux-cored solder wires and preforms. It is not the intent of this standard to exclude any acceptable flux or soldering material; however, these materials must produce the desired electrical and metallurgical interconnection.

The requirements for fluxes are defined in general terms for standard classification. Appendix B has additional information that will help users understand some of the requirements of this standard. In practice, where more stringent requirements are necessary or other manufacturing processes are used, the user shall define these as additional requirements.