WF-7742 VOC-Free Wave Solder Flux (5 Gallon)
VOC-Free Wave Solder Flux
VOC-free fluxes use water as the dominant solvent. In addition to limiting the amount of volatile organic compounds (VOC) into the atmosphere, sometimes associated with global warming, VOC-free fluxes are also non-flammable. The disadvantage of VOC-free/water-based fluxes is that they require more pre-heat to drive off the water than similar alcohol-based fluxes. In addition, assemblers must be careful to ensure that the top side of the circuit board is dry, otherwise, it could lead to reliability issues in the form of electromigration.
WF-7742 VOC-Free Wave Solder Flux
WF-7742 is a VOC-free, no-clean flux specifically developed for Pb-free wave soldering of surface mount, mixed-technology, and through-hole electronic assemblies.
WF-7742 is a water-based, nonflammable formulation that dramatically reduces VOC emissions and eliminates special storage requirements. A wide process window provides excellent solderability on difficult-to-solder assemblies and reduces solder balling.
Physical Properties
| Test | Result |
| Color | Clear |
| Specific Gravity @25°C (77°F) | 1.014 |
| Specific Gravity @15.5°C (60°F) | 1.014 |
| Acid Value | 36 |
| Solids Content | 5.76 |
| Flash Point (°F TCC) | None |
| J-STD-004A Flux Type | ORL0 |
| Shelf Life | 18 months from date of manufacture |
Safety
WF-7742 is a nonflammable material. Standard handling precautions should be observed when handling this material.
Process Recommendations
WF-7742 should be applied by atomizing or ultrasonic spray for best results. Topside board temperatures can range from 110–135°C depending on equipment capability and assembly requirements. Contact with the solder wave can be as long as 5 seconds. Preheat temperature should be adjusted to ensure complete water removal before contact with the solder wave.
A thin uniform flux deposition of 1,000–1,500 micrograms per square inch of flux solids should be applied as a starting point.
Because WF-7742 is water-based, it does not require frequent acid value monitoring. If thinning is required, deionized water should be used.
WF-7742 may freeze if exposed to temperatures below 0°C (32°F). If the flux becomes frozen, bring to room temperature until thawed and agitate. The material is not affected by freezing.