No Clean Fluxes 395 Alcohol Based

BOW ELECTRONIC SOLDER
TECHNICAL BULLETIN
BOW #358
ALCOHOL BASED, NO CLEAN FLUX

Description :

BOW #358 is a specifically formulated low-solids flux free of any halides, resin or rosin. It was formulated for soldering high quality electronic printed circuit boards, such as, through-hole, mixed technology and surface mount assemblies while eliminating the need for a post-solder cleaning operation. It can be applied by foam or spray systems.

Benefits :

Eliminates the need for cleaning soldered boards.
May be conformal coated without post cleaning.
Can be used with lead free solder.

Application :

Wave Soldering
Bow #358 can be applied by foam, spray, or wave application. The optimum
Topside PCB preheat temperature recommendation is 200-240° F/ 93-115°C. Too low a preheat setting is indicated by post-solder residues on PCBs that look like water stains.
For optimum soldering results, use the following guidelines:
1. Make certain that PCB surfaces are fee of any oil, grease, or other impurities.
2. Maintain a consistent foam head by narrowing the flux chimney, or using dual     flux stones.
3. Add fresh flux to maintain proper flux level in flux tank.
4. Replace the flux daily unless a sealed, self-contained system is used; such as     in a spray fluxing system.
5. Regularly clean the fluxing equipment. Never leave foaming stone in flux when
    pressure is not applied.
6. Clean fluxing stone in BOW 121T flux thinner.
7. When foam fluxing, flux properties can be maintained by monitoring the specific
    gravity. However, control by checking the acid value is recommended as the
    most accurate measure.
8. Add BOW 121T flux thinner when needed.

Physical Properties :	#358
Specific Gravity @ 25°C	0.8075 ± 0.005
Pounds/Gallon	6.735
Color	Slight amber, clear
Halide Content	None
Acid Value	25-31
pH	3.45 ± 0.25
Percent Solids	3.0 ± 0.25
Flash Point (TCC)	15°C/ 56°F

Safety Precautions :

BOW #358 is a flammable product and should be handled with care and the normal precautions taken when working with chemical products. When soldering with BOW #358, adequate exhaust ventilation should be provided.
Avoid contact with eyes, skin, and mucous membranes. It is recommended that one wear NIOSH approvedsafety equipment when working with chemicals. Store in plastic containers away from heat, flame or sparks.
Refer to Material Safety Data Sheet (MSDS) for additional information
Store flux in an area with controlled temperature between 18°C/64°F - 25°C/77°F.

Surface Insulation Resistance :

Test to IPC-SF-818 Conditions

7 days @ 85°C/85 % Relative Humidity
Test pattern: IPC-B25 test pattern, 0.0125 in. space, and 0.0125 in. wide lines.
Environment: 35°C, 90% Relative Humidity
Bias Voltage: 45-50 Volts DC, Test Voltage: 10

Average Test Results :
Specific Gravity @ 25°C	0.8075 ± 0.005
Pounds/Gallon	6.735
Color	Slight amber, clear
Halide Content	None

Electromigration Test Conditions :

Test Pattern : IPC-B-25 test pattern, 0.0125 in. space, and 0.0125 in. wide lines.
Environment : 85°C, 85% Relative Humidity
Bias Voltage : 100 Volts DC, Test Voltage: 100 Volts DC
Conditional Potential : 0, Initial Reading: 96 hours conditioning, Final Reading: 500 hours

Test Results :
Board	Initial Reading	Final Reading
Control	5.25 X 1011 Ohms	5.85 X 1011 Ohms
Pattern Up	Up 5.92 X 1011 Ohms	7.22 X 1011 Ohms
Pattern Down	6.95 X 1011 Ohms	8.25 X 1011 Ohms

Visual Examination :

No evidence of dendritic growth or corrosion when viewed under magnification level of 10X.