CircuitWorks Tacky Flux: Use and Working Conditions

This article is based on an original publication by Chemtronics.

Used regularly in a range of electronics assembly applications, tacky fluxes are typically similar to honey in their consistency and are often used in ball attach applications, BGA reballing or hand soldering.

A mildly activated rosin (RMA) no-clean formula, No-Clean Tacky Flux from CircuitWorks features a unique blend of stabilizers and activators designed to extend shelf life and product stability. The resulting flux offers a stable post-solder residue that can remain on the board without cleaning.

Performance Characteristics

Combining a stable platform with robust activity, CircuitWorks No-Clean Tacky Flux shares characteristics of both traditional RMA paste flux and synthetic low-residue tacky flux. While a typical RMA flux generally lacks stability and consistency, synthetic low-residue tacky fluxes are stable but not sufficiently active to accommodate a full range of soldering applications. CircuitWorks No-Clean Tacky Flux offers the perfect middle-of-the- road alternative.

Screen printed or manually applied with a dispenser or syringe, CircuitWorks No-Clean Tacky Flux can also be applied by spreading it to cover the desired soldering area. It's the perfect solution for applications including: BGA ball attachment/detachment, repair and rework of PCB components, and specialty soldering requirements, such as components that cannot be attached using traditional methods.

With a typical soldering temperature range of 480-650°F or 240-343°C, CircuitWorks has the capacity to perform at even higher temperatures depending on application, and can be used with heat sources including a soldering iron, reflow oven or other reflow tools.

Flux Residues

With its brown, translucent residue, CircuitWorks No-Clean Tacky Flux is both halide and halogen-free, leaving a stable post-solder reside which is pin-testable and does not require removal or cleaning.


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