951 Flux-Pen® Datasheet by Kester Solder

ID- :52 kester E.I
®
951 FLUX-PEN®
Low-Solids No-Clean Flux-Pen®
Product Description
Kester 951 Flux-Pen® is a halogen-free, non-rosin Flux-Pen® that is specifically designed for rework of conventional and
surface mount circuit board assemblies. The extremely low solids content (2.0%) and nature of the activator system re-
sults in practically no residue left on the assembly after soldering. There are no residues to interfere with electrical testing.
951 Flux-Pen® exhibits improved soldering performance to minimize solder bridges (shorts) during rework operations. This
flux is suitable for automotive, computer, telecommunications and other applications where reliability considerations are
critical. The surface insulation resistance on soldered boards is higher than that provided by typical organic water-soluble
fluxes. 951 Flux-Pen® contains a corrosion inhibitor such that no corrosion products are formed when bare copper surfac-
es are exposed to humid environments.
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
SIR, IPC (typical): Pass
Tested to J-STD-004, IPC-TM-650, Method 2.6.3
Blank 951
Day 1 2.3 ×1010 Ω 9.4 × 109 Ω
Day 4 1.3 ×1010 Ω 7.8 × 109 Ω
Day 7 9.8 ×109 Ω 6.3 × 109 Ω
Physical Properties
Specific Gravity: 0.814
Anton Paar DMA @ 25°C
RoHS Compliance
This product meets the requirements of the Restriction of Hazardous Substances (RoHS) Directive, 2011/65/EU for the
stated banned substances.
Percent Solids (theoretical): 2.0%
Performance Characteristics:
Improves soldering performance
Eliminates the need and expense of
cleaning
Non-corrosive tack-free residues
Compliant to GR-78-CORE
Classified as ORL0 per J-STD-004
Acid Number (typical): 14.3 mg
KOH/g flux
Tested by potentiometric titration
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
Technical Data SheetTechnical Data Sheet
IEI IIE IEI 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
951 Flux-Pen® is flammable. Store away from sources of ignition. Shelf life is 1 year from the date of manufacture when
handled properly and held at 10-25°C (50-77°F). The cap must be in place when not being used.
Cleaning
951 Flux-Pen® flux residues are non-conductive, non-corrosive and do not require removal in most applications.
Process Considerations
951 Flux-Pen® should only be applied to areas that will be fully heated by the soldering iron or other reflow tool. Care
should be taken to avoid flooding the assembly. The surface tension has been adjusted to help the flux form a thin film on
the board surface allowing rapid solvent evaporation.
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
Flux Application
951 Flux-Pen® is applied to circuit boards via Flux-Pen® for rework of printed wire assemblies.