Product Overview

Kester 951 is a halogen-free, rosin-free, low solid, low residue no-clean flux. The extremely low-solids (2.0%) and nature of the activator system results in practically no residue left on the assembly after soldering. Boards are dry and cosmetically clean as they exit the wave solder machine. There are no residues to interfere with electrical testing.

Kester 951 exhibits improved soldering performance to minimize solder bridges and excessive solder defects. The surface insulation resistance on soldered boards by Kester 951 is higher than that provided by typical water soluble fluxes. It contains a corrosion inhibitor such that no corrosion products are formed when bare copper surfaces are exposed to humid environments.

 

 

Product Features

  • Halogen free
  • Thermally stable activators for good hole-fill, low solder bridging and low solder balling
  • Very low level of non-tacky residue to improve pin testability and eliminate post-soldering cleaning
  • SIR IPC J-STD-004 compliant for long term electrical reliability
  • ORL0 per IPC J-STD-004
Technical Bulletin
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Documentation icon - Technical Bulletin

Kester 951 Technical Bulletin English

Low Residue, Low Solid, No-clean Flux

This rosin-free no-clean flux shows excellent solderability and is suitable for automotive, computer, telecommunications and other applications, where reliability considerations are critical. 

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Kester 951 solderability

Related Products

  • Low Residue
  • Low Solid
  • Pin Testable
  • Low Solder Balling
  • High Reliability

Product Type

Product Name

Halogen Free

Solid Content

Pin Testability

Best Used Assembly Type

Liquid Flux

ALPHA EF-6103

No

L

*****

I, II, III

Liquid Flux

ALPHA SLS-65C

YES

VL

*****

II, III

Liquid Flux

ALPHA EF-6000

No

VL

*****

II, III

Rework Flux

ALPHA NR205

YES

VL

*****

I, II, III

Cored Wire

ALPHA FT-2002

No

N/A

*****

N/A

Cored Wire Kester 268 YES N/A ***** N/A
Cored Wire ALPHA Telecore HF-850 YES N/A ***** N/A
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