ZESTRON FA+ en

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When cleaning PCB assemblies, the primary goal is to remove contaminants from populated boards and hybrid circuits resulting from fluxes and improper handling. The use of engineered PCB cleaning solutions is essential to ensure flux residues are fully removed from the assemblies used in high-reliability applications and industries such as automotive, medical, aerospace, and military.

The targeted use of a cleaning agent substantially improves the integrity of subsequent processes such as bonding and conformal coating. Residues can cause improper adhesion of bonds that can lead to failures such as heel cracks or lift-offs. During the coating process, remaining residues can result in poor wetting and delamination that can cause assembly failures and ultimately lead to field failures.

These reliability risks are increased when using lead-free solder pastes as they contain more resins as well as aggressive activator systems and are soldered at higher temperatures.

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ZESTRON FA+ is a solvent-based cleaning agent designed to remove all types of flux residues from electronic assemblies, ceramic hybrids, power electronics (power modules, leadframe-based discrete components, Power LEDs), and packages (Flip Chips/CMOS). It is surfactant-free, easily rinsed and does not require explosion-proof precautions.

Advantages compared to other surfactant cleaners:

High bath loading capability results in long bath life
Does not require any specific explosion-proof environment
Due to the surfactant-free formulation, it is easily rinsed
Increases wire bonding/molding quality for power modules, leadframe-based discrete components and Power LEDs
Ensures a void-free underfill and improves the image resolution by removing all tacky fluxes from Flip Chips/CMOS
Has been EMPF Phase II tested and MIL approved
Listed on the ESA ‘list of declared materials’

Area of Specific Application

PCB and advance packaging defluxing

Process

Ultrasonic
Spray-under-immersion
Centrifugal cleaning

Contamination

Flux residues
Solder paste (unsoldered)
SMT or conductive adhesives

Technology

Solvent-based

Zestron FA-Plus Technical Data Sheet