Technical Data Sheet
245 Flux-Cored Wire
No-Clean Cored Wire for Lead-bearing and Lead-free Alloys
Product Description
Kester 245 was developed to complement low residue liquid fluxes being used by the electronics industry. The chemistry
is based on some of the same principles that have been safely used for years in mildly activated rosin fluxes. The use of
245 results in visually acceptable assemblies without cleaning, yet soldering quality and efficiency is comparable to that
obtained with mildly activated rosin flux. 245 was formerly classified as Type LR per MIL-F-14256. 245 is Bellcore GR-78
compliant.
Performance Characteristics:
Highly reliable post-soldering Compatible with leaded and lead Compliant to Bellcore GR-78
residue free alloys
Minimal residue Classified as ROL0 per J-STD-004
RoHS Compliance
This product meets the requirements of the Restriction of Hazardous Substances (RoHS) Directive, 2011/65/EU for the
stated banned substances. (Applies only if this core flux is combined with a lead-free alloy)
Reliability Properties
Spread Test (typical): Surface Insulation Resistivity (SIR)
Copper Mirror Corrosion: Low
Tested to J-STD-004, IPC-TM-650, Method
Tested to J-STD-004, IPC-TM-650, Method 40C/90%RH, IPC (typical): Pass
2.4.46
Tested to J-STD-004B, IPC-TM-650, Method
2.3.32
2.6.3.7
Area of
Corrosion Test: Low 2
Spread mm
Tested to J-STD-004, IPC-TM-650, Method
2 Surface Insulation Resistance (SIR),
(in )
2.6.15
IPC (typical): Pass
Plastic Rosin Core 194 (0.30) Tested to J-STD-004, IPC-TM-650, Method
Fluorides by Spot Test: Pass
2.6.3.3
Tested to J-STD-004, IPC-TM-650, Method 285 Mildly Activated Rosin 335 (0.52)
Test Conditions: 85C, 85% RH, 7 days, 100V
2.3.35.1
245 No-Clean 348 (0.54)
Blank 245
Chloride and Bromides: None
10 8
Day 1 1.33*10 1.56*10
Silver Chromate: Pass
Detected
Tested to J-STD-004, IPC-TM-650, Method
Tested to J-STD-004, IPC-TM-650, Method 9 9
Day 4 8.78*10 1.48*10
2.3.33
2.3.35
9 9
Day 7 7.53*10 2.76*10
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
Application Notes
Availability
245 cored wire is available in a wide variety of alloys, wire diameters, flux percentages and roll sizes in both leaded and
lead free alloys. Please refer to www.kester.com for wire diameters, flux percentages and roll sizes that are available.
Note: Core size 50, 58 and 66 = 1.1%, 2.2% and 3.3% flux core.
Process Considerations
Solder iron tip temperatures are most commonly between 315-343C (600-650F) for Sn63Pb37 and Sn62Pb36Ag02
alloys, and 371-400C (700-750F) for lead-free alloys. Heat both the land area and component lead to be soldered with
the iron prior to touching the land with the cored wire. Do not apply the wire directly to the soldering iron tip. If needed,
Kester 951 or 952-D6 no clean flux may be used as a compatible liquid flux to aid in reworking soldered joints. Kester 951
and 952-D6 are available in Flux-Pens for optimum board cleanliness.
Cleaning
The 245 flux residues are non-corrosive, non-conductive and do not require removal in most applications. IPA will
not clean the residues off the surface of the circuit board after the soldering process. A saponifier or cleaning agent
specifically designed to clean a no-clean flux is required to clean the residues. Please contact Kester Technical Support
for further information.
Storage and Warranty Period
Storage must be in a dry, non-corrosive environment between 10-40C (50-104F). The surface may lose its shine and
appear a dull shade of grey. This is a surface phenomenon and is not detrimental to product functionality. Flux-cored
solder wire has a limited warranty period determined by the alloy used in the wire. For alloys containing more than 70%
lead, the warranty period is 2 years from the date of manufacture. Other alloys have a warranty period of 3 years from the
date of manufacture.
Health and Safety
This product, during handling or use, may be hazardous to your health or the environment. Read the Safety Data Sheet
(SDS) and warning label before using this product.
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