WF-9940 Wave Solder Flux is Indium Corporation’s most active low-solids rosin-containing no-clean wave solder flux. WF-9940 was developed to meet the requirements of J-STD-004 as an ROL1, effectively soldering through-hole and mixed-technology assemblies. It performs well with both SnPb and Pb-free solders. WF-9940 is very heat-stable and well suited for selective soldering applications. Even with the high degree of activation, WF-9940 passes all common reliability requirements. It is non-corrosive and does not contribute to detrimental circuit board insulation resistance degradation or electrochemical migration.
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