44 Flux-Cored Wire
Activated Rosin Cored Wire for Lead-Free and Leaded Alloys
Product Description
Kester 44 Rosin Flux is an activated rosin formula for use in ux-cored solder wire. 44 has virtually dominated the eld
of activated rosin core solders for well over ve decades. An outstanding performance feature of this ux is the “instant-
action” wetting behavior. The high mobility and fast-spreading action of this ux results in more reliable production line
soldering. Under IPC J-STD-004, 44 is classied as ROM1. Despite the increased activity and soldering performance, 44
passes both 85°C/85% RH and 40°C/90% RH SIR test methods.
Reliability Properties
Copper Mirror Corrosion: Moderate
Tested to J-STD-004, IPC-TM-650, Method
2.3.32
Corrosion Test: Moderate
Tested to J-STD-004, IPC-TM-650, Method
2.6.15
Silver Chromate: Fail
Tested to J-STD-004, IPC-TM-650, Method
2.6.33
Chloride and Bromides: 0.44%
Tested to J-STD-004, IPC-TM-650, Method
2.6.35
Fluorides by Spot Test: Pass
Tested to J-STD-004, IPC-TM-650, Method
2.6.35.1
Surface Insulation Resistance (SIR)
40°C/90% RH, IPC (typical): Pass
Tested to J-STD-004B, IPC-TM-650, Method
2.6.3.7
Surface Insulation Resistance (SIR),
IPC (typical): Pass
Tested to J-STD-004, IPC-TM-650, Method
2.6.3.3
Test conditions: 85°C, 85% RH, 7 days, 100V
Blank 44
Day 1 7.46*10
9
Ω 2.2*10
8
Ω
Day 4 4.9*10
9
Ω 2.88*10
9
Ω
Day 7 7.7*10
9
Ω 7.14*10
9
Ω
RoHS Compliance
Kester does not determine any applicable Restriction of Hazardous Substances (RoHS) exemptions for our lead
containing products at the user level. (Applies only if this core ux is combined with a lead-free alloy)
Performance Characteristics:
■ High activity RA formulation
■ Passes both 85°C/85% RH and
40°C/90% RH IPC SIR testing
■ Excellent solderability to a wide
range of metalizations
■ Industry standard RA cored wire for
decades
■ Classied as ROM1 per J-STD-004
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 Sheet
