SMT007 Magazine

SMT-Aug2018

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34 SMT007 MAGAZINE I AUGUST 2018 that meets the requirements of J-STD-004B for a no-clean flux. The flux is classified ROM1 and contains 7.0% solids content. RMA Fluxes Flux 14 is a flux that was originally classified under the requirements of MIL-F-14256 as flux type RMA and contains 25% total solids. It is classified as ROL1 under J-STD-004B criteria. Flux 15 meets the requirements of J-STD- 002 and J-STD-003 solderability test flux #2. It is classified ROL1 under J-STD-004B and contains 25% total solids. Results SIR and Localized Cleanliness Testing Results All fluxes passed the qualitative portion of SIR testing (no evidence of corrosion or elec- trochemical migration on any coupons after environmental conditioning under bias). The following discussion focuses on the quanti- tative output of the SIR and cleanliness test- ing and comparison of that data to the applied limits for each test. The full plotted values for SIR vs. time and localized cleanliness testing current vs. time are provided in Appendix A. Alcohol-based Rosin-free Fluxes Flux 4 is a rosin-free alcohol-based flux originally developed when tin- lead wave soldering was the norm and the original revision of J-STD-004 was the current release. The flux is classified as ORL0 and contains 2.2% solids content. Flux 5 is a rosin-free alcohol-based flux originally characterized under the requirements of J-STD-004A. The flux is classified as ORL0 and contains 2.2% solids content. Alcohol-based Fluxes with Rosin, OR-class (Low Rosin) Flux 6 is a rosin-bearing alcohol- based flux that meets the require- ments of J-STD-004B for a no-clean flux. The flux is classified ORL0 and contains 3.6% solids content. Flux 7 is a rosin-bearing alcohol-based flux that meets the requirements of J-STD-004B for a no-clean flux. The flux is classified ORL0 and contains 4.3% solids content. Flux 8 is a rosin-bearing alcohol-based flux that meets the requirements of J-STD-004B for a no-clean flux. The flux is classified ORL0 and contains 3.6% solids content. Flux 9 is a rosin-bearing alcohol-based flux that meets the requirements of J-STD-004B for a no-clean flux. The flux is classified ORL0 and contains 6.0% solids content. Alcohol-based Fluxes with Rosin, RO-class (High Rosin) Flux 10 is a halogen-free rosin-bearing alco- hol-based flux that meets the requirements of J-STD-004B for a no-clean flux. The flux is clas- sified ROL0 and contains 4.0% solids content. Flux 11 is a rosin-bearing alcohol-based flux that meets the requirements of J-STD-004B for a no-clean flux. The flux is classified ROL0 and contains 4.1% solids content. Flux 12 is a rosin-bearing alcohol-based flux that meets the requirements of J-STD-004B for a no-clean flux. The flux is classified ROL0 and contains 6.0% solids content. Flux 13 is a rosin-bearing alcohol-based flux Table 1: Summary of fluxes tested.

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