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LENJEX Project Record
De-Flux Cleaning for a Vietnam PCB Manufacturer
An electronics manufacturer removed flux and ionic residues from soldered boards before conformal coating.
LocationBac Ninh, Vietnam
IndustryElectronics / PCB Assembly
EquipmentLJ-LAB30 laboratory ultrasonic cleaner
Commissioned2025
Project Context
Flux residues before coating
The contract assembler soldered boards with rosin flux and required a clean, dry surface before conformal coating.
Before LENJEX
Residue under components
Flux and ionic residues under components affected reliability and coating adhesion.
- Rosin flux under components
- Ionic residues
- Need for complete drying
- Mixed board and component compatibility
Cleaning Solution
Controlled de-flux wash and drying
The LJ-LAB30 used compatible de-flux chemistry with controlled energy, followed by complete drying before coating.
Board compatibility was confirmed with representative assemblies first.
Project Outcomes
Cleaning results and process improvements
Performance depends on the workpiece, contamination, chemistry, loading method and acceptance criteria.
- Result 01Flux and ionic residues removed before coating
- Result 02Boards dried completely under components
- Result 03Improved coating adhesion and reliability
- Result 04Repeatable process for mixed boards
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