助焊筆RMA615

                    助焊筆RMA615
                    概述參數

                    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

                        ·      Maximum achievable RMA activity.  Very fast wetting flux.

                    ·      Very cleanable, even with high preheat.  No white residue.

                    ·      Excellent foaming properties.  Uniform, consistent flux coverage.


                     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

                     

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

                    2 Test 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 1011 ohms


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


                    >1.0 x 109 ohms


                    Flash Point (T.C.C.)


                    53°F


                    Recommended Alpha Thinner


                    438




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