985M Low Solids, No Clean Flux Pen (PDF)

Low-Solids No-Clean Flux Pen ®
Product Description
Kester 985M is a low solids, halide-free, no clean
Flux Pen® that is specifically designed for rework
of conventional and surface mount circuit board
assemblies. 985M was developed for use with
both traditional tin-lead and lead-free solder
alloys. Kester 985M 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.
Performance Characteristics:
Improves soldering performance
Eliminates the need and expense of cleaning
Non-corrosive tack-free residues
Classified as ROL0 per J-STD-004
Compliant to Bellcore GR-78
Physical Properties
Specific Gravity: 0.805 ± 0.005
Antoine Paar DMA 35 @ 25°C
Percent Solids (theoretical): 3.60
Acid Number (typical): 20.0 mg KOH/g of flux
Tested by potentiometric titration
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
SIR, IPC (typical): Pass
Tested to J-STD-004, IPC-TM-650, Method
Day 1
Day 4
Day 7
1.3 ´ 10 W
9.7 ´ 109 W
8.2 ´ 109 W
7.3 ´ 109 W
1.1 ´ 1010 W
1.1 ´ 1010 W
985M Flux Pen®
Application Notes
Flux Application:
Kester 985M is applied to circuit boards via Flux Pen® for rework of printed wire assemblies.
Process Considerations:
Kester 985M 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.
Kester 985M flux residues are non-conductive, non-corrosive and do not require removal in most applications.
Storage and Shelf Life:
Kester 951 is flammable. Store away from sources of ignition. Shelf life is 2 years from date of manufacture
when handled properly and held at 10-25°C (50-77°F).
Health & Safety:
This product, during handling or use, may be hazardous to health or the environment. Read the Material
Safety Data Sheet and warning label before using this product.
World Headquarters: 800 W. Thorndale Avenue, Itasca, Illinois, 60143 USA
Phone: (+1) 847-297-1600 • Email: customerservice@kester.com • Website: www.kester.com
Asia Pacific Headquarters
500 Chai Chee Lane
Singapore 469024
(+65) 6449-1133
European Headquarters
Zum Plom 5
08541 Neuensalz
(+49) 3741 4233-0
Japanese Headquarters
20-11 Yokokawau 2-Chome
Tokyo 130-0003 Japan
(+81) 3-3624-5351
The data recommendations presented are based on tests, which we consider reliable. Because Kester has no control over the conditions of use, we disclaim any responsibility connected with the
use of any of our products or the information presented. We advise that all chemical products be used only by or under the direction of technically qualified personnel who are aware of the potential hazards involved and the necessity for reasonable care in their handling. The technical information contained herein is consistent with the properties of this material but should not be used in
the preparation of specifications as it is intended for reference only. For assistance in preparing specifications, please contact your local Kester office for details.
Rev: 27Apr2011