• 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 2.3.35.1

• SIR, IPC (typical): Pass
  Tested to

• J-STD-004, IPC-TM-650, Method 2.6.3.3

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.

Cleaning:
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.