Wave Flux

Wave Flux

Indium Corporation offers a full line of competitive, state-of-the-art wave solder fluxes for electronics assembly. We are the first company to introduce halogen-free, Pb-free wave fluxes that perform as well as the more established halogen-containing tin-lead wave fluxes.

In addition, we provide bar solders in:

  • Sn63
  • Sn60
  • SAC305
  • SAC0307
  • Sn992
  • Sn995

Alcohol-based

The main advantage of alcohol-based fluxes is that they require less preheat to drive off the solvent prior to entering the wave. This allows assemblers to run smaller wave soldering machines at a higher throughput rate. It also reduces the concern about flux that has not been completely heated inadvertently transferring to the top side of the circuit board.

Fluxes that have high solids content, as well as higher amounts of halogen, tend to be more heat-stable and solder better with a variety of board types, sizes, and thicknesses. Fluxes with lower solids contents and no rosin tend to be easier to electronically probe-test and have less visually apparent residue. Halogen content is not necessarily an indicator of final circuit board reliability since halogen types vary and rosin in the flux will enhance an assembly's surface insulation resistance.

Alcohol No-Clean, Standard Products
Formula Acid # Solids % S.G.
25°C
J-STD-004 J-STD-004B Halogen Apply Thinner Description
WF-9940 18 3.6 0.795 ROL0 ROL1 <0.9% Spray 16-3000 Rosin Containing, Heat Stable, High activity
WF-9942 36 4.4 0.828 ORL0 ORL1 <0.3% Spray 16-3000 Low Rosin/Resin, Heat Stable, High activity
WF-9945 12.3 5.6 0.802 ROL0 ROL0 <50ppm Spray 16-3000 Rosin, Heat Stable, Halogen Free, high reliability
WF-9948 13.4 3.3 0.792 ROL0 ROL1 <900ppm Spray 16-3000 Lower Residue version of WF9940, improved PTH fill
WF-9955 26.25 4.71 0.796 ORL0 <500ppm Spray 16-3000 Halogen-free, no rosin, exhibits exceptional hole fill
WF-9958 28.50 4.99 0.798 ORM0 <500ppm Spray 16-3000 Halogen-free, no rosin, exhibits exceptional hole fill
3541 25 4.3 0.800 ORL0 ORL1 <0.5% Spray 16-3000 No-Clean, Resin Containing, Conformal Coat Comp
3590-T 16 1.9 0.801 ORL0 ORL0 <50ppm Spray 16-3000 Halogen Free, Very Low Solids
3592 22 3.0 0.820 ORL0 ORL1 <0.2% Spray 16-3000 Rosin/Resin Free Low Solids
NR10D 12 1.5 0.791 ORL0 ORL0 <50ppm Spray 16-3000 Rosin/Resin Free Very Low Solids

Fluxes are available in 1-gallon and 5-gallon containers, and 55-gallon drums.

VOC-free

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.

VOC-Free No-Clean, Standard Products
Formula Acid # Solids % S.G.
25°C
J-STD-
004
J-STD-
004B
Halogen Apply Thinner Description
1010 N/A 20.0 1.055 ORH1 ORH1 ~ 4.5% Spray N/A High Activity Water Wash VOC-Free
1072 25 5.0 1.017 ORL0 ORL1 < 0.35% Spray 16-1072 VOC Free high reliability, Solubilized Rosin
1075-EX30 30 2.9 1.014 ORL0 ORL1 < 0.5% Spray N/A VOC Free Very Low Solids
1075-EXR30 30 4.5 1.015 ORL0 ORL1 < 0.5% Spray N/A VOC Free Moderate Low Solids
1075-EXR40 40 5.0 1.019 ORL0 ORL1 < 0.5% Spray N/A VOC Free Low Solids
WF-7742 35 5.8 1.014 ORL0 ORL1 < 0.3% Spray N/A High Activity, VOC Free, Low Solids
WF-7745 39.5 4.2 1.013 ORL0 ORL0 < 50 ppm Spray N/A VOC Free Halogen Free, Higher reliability

Fluxes are available in 1-gallon and 5-gallon containers, and 55-gallon drums.

Water-wash

Before no-clean fluxes became the most commonly used materials in wave soldering, water wash fluxes had an extended run as the preferred material. The advantage of water wash fluxes is that they can be formulated to be very active so that they can solder virtually any assembly without a concern for reliability, since the residue will be removed after the soldering process. The disadvantage of water wash fluxes is that assemblers must have an additional piece of equipment, the water wash system, to remove the flux residue, and must deal with the effluent.

Neutral pH fluxes can generally be left on the circuit board for extended periods of time before washing, while the "low" pH fluxes generally solder somewhat better.

Water Washable, Standard Products
Formula pH Solids % S.G. J-STD-004 J-STD-004B Halogen Apply Thinner Description
1085 Low 12.4 0.860 ORH0 ORH0 < 50 ppm Spray 16-1085 Water Wash, Halogen Free, Lower Solids
1095-NF 6.8-7.2 19.5 0.838 ORH1 ORH1 < 4.5% Spray 16-1000 Water Wash, Neutral pH
1081 Low 28.4 0.957 ORH0 ORH0 < 50 ppm Spray 16-1081 Preferred, Heat Stable Water Wash Halide-Free
1010 Low 20.0 1.055 ORH1 ORH1 ~ 4.5% Spray N/A High Activity Water Wash VOC-Free

Fluxes are available in 1-gallon and 5-gallon containers, and 55-gallon drums.

Rosin-based

The original fluxes for electronics assembly were rosin-based. Prior to the IPC's J-STD-004(b), the defense electronics industry established specifications for fluxes. To this day, some contracts still exist that require fluxes that conform to the old Mil-Spec Mil-F-14256 or QQ-S-571 as a type R, RMA, or RA, even though these specifications have officially been folded into the J-Standard. Rosin-based fluxes were popular because not only is rosin a natural weak flux when molten, but it is also a good dielectric material when solid. Small amounts of residue left on the assembly generally will not harm the assembly unless it operates at high temperature and humidity.

Rosin Fluxes, Standard Products
Formula Acid # Solids % S.G.
25°C
J-STD-004 J-STD-004B Halogen Apply Thinner Description
2036 50 35% 0.869 ROL0 ROL0 <50ppm Foam 16-3000 Rosin Type "R", ROL0
2212 38 25% 0.859 ROL1 ROL1 <0.15% Foam 16-2212 Rosin Type "RMA", ROL1

Fluxes are available in 1-gallon and 5-gallon containers, and 55-gallon drums.