RF741 Series Datasheet by Kester Solder

ID- :52 kester E.I
Product Description
Kester RF741 is a high-viscosity, no-clean flux designed for electronic component rework and repair applications. RF741
has a gel-like consistency and is easily applied by syringe dispensing. RF741 can be precisely dispensed onto a specific
area that needs flux. After being dispensed, RF741 stays in place until soldering occurs. Traditional problems experienced
with controlling the application of low solids no-clean liquid fluxes are eliminated. RF741 has excellent performance in
applications requiring a flux having good thermal stability such as surface mount component repair. RF741 is the ideal
choice for QFP or BGA semi-automated rework operations. In addition, RF741 is well suited for use with through-hole
repair operations where solder fountain or controlled solder reservoir is being used for selective component removal and
repair. Residues that remain on surfaces after soldering are almost colorless, leaving a very cosmetically appealing repair.
The residue has high electrical resistance and can be left on the assembly after soldering. Residues are compatible with
all no-clean fluxes in the Kester product line. RF741 can be used in combinations with Kester no-clean cored wire solders
and no-clean solder pastes, as well as no-clean liquid fluxes without any compatibility risks.
Reliability Properties
Copper Mirror Corrosion: Low
Tested to J-STD-004, IPC-TM-650, Method
2.3.32
Corrosion Test: Low
Tested to J-STD-004, IPC-TM-650, Method
2.6.15
Silver Chromate: Pass
Tested to J-STD-004, IPC-TM-650, Method
2.3.33
Chloride and Bromides: None
Detected
Tested to J-STD-004, IPC-TM-650, Method
2.3.35
Fluorides by Spot Test: Pass
Tested to J-STD-004, IPC-TM-650, Method
2.3.35.1
Surface Insulation Resistivity (SIR):
Pass
Tested to J-STD-004, IPC-TM-650, Method
2.6.3.3
Blank RF741
Day 1 2.5*1010 Ω 4.0 × 108 Ω
Day 4 1.5*1010 Ω 1.6 × 109 Ω
Day 7 1.4*1010 Ω 4.0*109 Ω
Physical Properties
Viscosity (typical): 180 poise
Malcom Viscometer @ 10rpm and 25°C
Acid Number (typical): 75.0 mg KOH/g of flux
Tested to J-STD-004, IPC-TM-650, Method 2.3.13
RoHS Compliance
This product meets the requirements of the Restriction of Hazardous Substances (RoHS) Directive, 2015/863 for the
stated banned substances.
Performance Characteristics:
■ Compatible with most no-clean
chemistries
■ Leaves bright/shiny solder joints
after reflow
■ Classified as ROL0 per J-STD-004 ■ Compliant to Bellcore GR-78
RF741 Rework Flux
No-Clean Electronic-Grade
®
Technical Data Sheet
Global Headquarters: 800 West Thorndale Avenue, Itasca, IL USA 60143 ■ Phone: +1 800.2.KESTER ■ Fax: +1 630.616.4044
Asia-Pacific Headquarters: 61 Ubi Avenue 1 #06-01 UB Point, Singapore 408941 ■ Phone: +65 6.449.1133 ■ Fax: +65 6.242.9036
European Headquarters: Ganghofer Strasse 45, 82216 Gernlinden, Germany ■ Phone: +49 (0) 8142 4785 0 ■ Fax: +49 (0) 8142 4785 61
Asia Manufacturing: Hengqiao Road, Wujiang Economic Development Zone ■ Suzhou, Jiangsu Province, China 215200 ■ Phone: +86 512.82060807 ■ Fax: +86 512.8206 0808
■ Website: www.kester.com ■
kester
Health and Safety
This product, during handling or use, may be hazardous to your health or the environment. Read the Safety Data Sheet
and warning label before using this product.
Storage, Handling and Shelf Life
Shelf life is 1 year from the date of manufacture when stored between 0-10°C (32-50°F).
Cleaning
RF741 is a no-clean chemistry. The residues do not need to be removed for typical applications. If residue removal is
required, call Kester Technical Support.
®
Application Notes
Global Headquarters: 800 West Thorndale Avenue, Itasca, IL USA 60143 ■ Phone: +1 800.2.KESTER ■ Fax: +1 630.616.4044
Asia-Pacific Headquarters: 61 Ubi Avenue 1 #06-01 UB Point, Singapore 408941 ■ Phone: +65 6.449.1133 ■ Fax: +65 6.242.9036
European Headquarters: Ganghofer Strasse 45, 82216 Gernlinden, Germany ■ Phone: +49 (0) 8142 4785 0 ■ Fax: +49 (0) 8142 4785 61
Asia Manufacturing: Hengqiao Road, Wujiang Economic Development Zone ■ Suzhou, Jiangsu Province, China 215200 ■ Phone: +86 512.82060807 ■ Fax: +86 512.8206 0808
■ Website: www.kester.com ■