Kapco Technologies - Soldering Fluxes through Chemistry

Kapco Technologies has produced the No Wash 85 soldering flux, a revolutionary breakthrough in No Clean technology. No Wash 85 has shown superior soldering properties and fewer visible residues on many types of assemblies. Optimum soldering of the challenging designs and substrates used in printed circuit board assemblies for the computer industry are readily achieved. An independent laboratory has shown that No Wash 85 complies with all of the requirements of the latest standard for high quality soldering assemblies.

Most of the solvents and solids of this unique flux chemical composition should evaporate during the normal wave soldering processes. Properly soldered assemblies will achieve SIR values beyond the established requirements. Washing is not necessary since any residual micro-contaminants are non-corrosive and halide-free. No Wash 85 creates less visible residue, fewer fumes and higher SIR values than comparable chemical soldering fluxes.

No Wash 85 will work within a wide range of soldering parameters. The dynamic relationship between pre-heat and conveyor speed are critical to the success of any flux. A combination of too much pre-heat or too slow of a conveyor speed will result in an over-heated board, re-oxidation of fluxed surfaces and poor soldering. Conversely, an under-heated board will not sufficiently evaporate flux solvents, leading to any combination of defects including blow-holes, solder balls or excess residues. If solder balls or spitting is seen during soldering, pre-heat temperature should be increased to eliminate the problem.

The specific gravity of No Wash 85 can be measured using standard chemistry research laboratory techniques and should be maintained between 0.805-0.825. This recommended range may be adjusted based on operator experience and soldering performance. Note that at increased specific gravity levels more chemical residues will be apparent due to a higher solids content for a given parameter setup. These products have proven a valuable resource to help meet the increasing demands of the electronics and computer industries.

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