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ALPHA 615 SERIES Super RMA Flux

GENERAL DESCRIPTION

Alpha 615 flux meets MIL-F-14256 requirements for flux type RMA, making it suitable for all Military work requiring conformance to DOD-STD-2000.  Alpha 615 also meets the IPC-SF-818 standard for type LR3NC, the lowest flux residue corrositivity category and the highest surface insulation resistance rating.

The standard solids content for 615 is 37%.  Where use of a lower solids flux is appropriate, such as when wave soldering surface mount boards, 615-25 (25% solids) and 615-15 (15% solids) are available.

FEATURES & BENEFITS

ACTIVITY

Alpha 615 is the most effective soldering flux yet developed for achieving excellent soldering yields with complex Military assemblies, while clearly passing all requirements for an RMA, non-conductive, non-corrosive flux.

Wetting balance and solder spread tests are widely used quantitative measures for comparing flux activity.  The faster the speed of solder wetting, as measured by the wetting balance, and the greater the area of solder spread, i.e. spread factor percent, the more efficient the flux is for promoting solder wetting.  The superior activity of 615 can be seen from the following test data:

Alpha

615

Kester

185

Almit RF35M

Spread Factor1

91.7%

90.2%

86.8%

Wetting Speed2

0.41 seconds

0.47 seconds

0.64 seconds

1Test conducted using oxidized copper and 60Sn/40Pb
   flowed at 500°F  for 15 seconds.

2Test conducted using oxidized copper, 60Sn/40Pb at 500°F,

   5 mm immersion depth and 10 second cycle time. Wetting
   speed measured as time for wetting to reach equilibrium.

Alpha 615 has also demonstrated the ability to prevent solder icicle formation, when tested according to the method developed by Philips-Eindhoven, Netherlands, “Determination of the Flux Efficiency to Prevent Formation of Icicles (and Bridges).”

USE

Alpha 615 is designed for wave soldering printed circuit assemblies that must use an RMA flux meeting military specifications.  While formulated to have excellent foaming properties, wave and spray fluxing can also be used.

All three solids levels of 615 flux should be maintained by periodic measurement of flux specific gravity (corrected to 77°F) and kept to within +0.015 and -0.005 of the nominal values.

While topside preheat temperatures of 180-200°F are sufficient for 615 flux activation, higher preheat conditions may be required for assemblies that have significant heat sinking characteristics, or when attempting to minimize the temperature gradient that ceramic chip components see between preheat and the solder wave.

Under conditions of extreme preheat, most RMA fluxes become extremely difficult to clean after soldering, especially with mild fluorocarbon-blend solvents.  Alpha 615 flux residues clean very well with either mild fluorocarbon-blend solvents or aqueous saponifier (Alpha 2110).

PACKAGING

Alpha 615 series fluxes are available in 1, 5 and 55 gallon containers.

HEALTH & SAFETY

Alpha 615 is flammable.  Keep away from heat, sparks and open flames.  Observe standard precautions for handling and use, such as in well-ventilated areas and avoidance of prolonged or repeated contact with skin.

TECHNICAL SPECIFICATIONS

Physical Properties

Typical Values

615

615-25

615-15

Appearance

Clear, amber liquid

Specific Gravity @ 77°F ± .005

.0878

0.845

0.818

Solids Content, % wt/wt

37

25

15

Water Extract Resistivity, ohm-cm,

per MIL-F-14256, typical

17,000

190,000

225,000

Chlorides and Bromides, per MIL-F-14256

(Silver Chromate Paper)

Pass

Pass

Pass

Copper Mirror, per MIL-F-14256

Pass

Pass

Pass

Corrosion, per IPC-SF-818

No Corrosion

No

 Corrosion

No Corrosion

Surface Insulation Resistance:

35°C/90% RH, comb-down, uncleaned, per Bellcore TR-TSY-000078

> 1.0 x 1011ohms

85°C/85% RH, comb-down, uncleaned, per IPC-SF-818, Class 3

>1.0 x 109ohms

Flash Point (T.C.C.)

53°F

Recommended Alpha Thinner

438