Direct Answer
Electronics and semiconductor cleaning is a residue-control decision, not a product choice. Selection turns on three variables: the residue — rosin or no-clean flux, solder paste, ionic contamination, dicing and handling residue; the substrate — copper traces and leadframes, plated finishes, solder mask, packaged devices, stencils and screen frames; and the cleaning route — ultrasonic immersion, spray-in-air, or immersion with mechanical agitation. We shortlist a formulation against those three variables, then confirm it on your own boards and residues.
Good fit when:
- A defined residue and a defined acceptance criterion, such as before conformal coating, bonding or final electrical test
- Copper, plated or solder-masked surfaces where over-aggressive chemistry causes tarnish, etching or discolouration
- Flux systems that vary by product — we match chemistry to the flux actually used on your line, not to a generic assumption
- Projects able to supply assembled boards or component samples for a cleaning trial
Do not assume:
- That the strongest chemistry is the correct one — copper and solder mask usually set the limit, not the residue
- That one formulation suits no-clean flux, water-soluble flux, solder paste and stencil cleaning alike
- That residue visible to the eye is the residue that fails electrical test or coating adhesion
- That a cleanliness or ionic-contamination result can be guaranteed from a formulation description
Solution Overview
Electronics assemblies rarely fail on visible dirt. They fail on residue: flux trapped under components and in via walls, solder paste carry-over, ionic contamination left by the soldering process, and handling or dicing debris on sensitive surfaces. What remains after cleaning drives coating adhesion, bond strength, contact resistance, electrochemical migration risk and final test yield.
This makes cleaning a process-control problem rather than a purchasing decision. A chemistry that is comfortably safe for a steel housing may tarnish a bare copper trace, lift solder mask, or leave a conductive film across a fine-pitch area. A bath that performs in an ultrasonic tank may foam out of a spray-in-air machine, or the reverse.
Cleanova Chem supplies industrial cleaning chemistry for electronics and semiconductor manufacturing, matched to your flux system, substrate sensitivity and cleaning equipment. Recommendations are supported by sample testing on your own boards and components, with English technical documentation and packaging arrangements for export markets.
Formulation Strategy and Process Matching
Key Selection Factors
- Residue type. Rosin flux, no-clean flux, water-soluble organic acid flux, solder paste, wave-solder dross, reflow residue, stencil paste and handling soils each respond to different chemistry families. Mixed residues typically need a staged or two-bath approach rather than one stronger product.
- Substrate sensitivity. Bare copper and leadframes, ENIG and other plated finishes, immersion silver, solder mask, anodized aluminium housings and exposed plastic connectors each tolerate different alkalinity, contact time and temperature. Tarnish, mask lift and plating discolouration are usually process errors rather than product faults.
- Feature geometry. Fine-pitch footprints, micro-vias, blind vias, under-component gaps and connector cavities retain flux that a simple immersion step will not release. Where geometry traps soil, mechanical energy and rinse design matter as much as the chemistry.
- Cleaning route and equipment. Ultrasonic immersion, spray-in-air and agitated immersion lines impose different foam, drainage and rinse requirements on the same formulation.
- Downstream step. The acceptance criterion — conformal coating, underfill and bonding, wire bonding, electrical test or incoming inspection — sets how clean is clean enough, and therefore how far the process needs to be pushed.
Chemistry Families
- Mildly alkaline aqueous chemistry — general flux, particulate and handling-soil removal on assemblies where copper and solder mask limit alkalinity.
- Neutral and near-neutral aqueous chemistry — where bare copper, aluminium housings or mixed-material assemblies are present and corrosion or tarnish risk must stay low.
- Dedicated flux and solder-residue removers — formulated for rosin, no-clean and solder paste residues on boards, leadframes and stencils, matched to the flux chemistry on your line.
- Copper anti-tarnish chemistry — oxide and tarnish film removal with controlled passivation, for copper surfaces and leadframes between process steps.
- Solvent-based and emulsion chemistry — heavy paste, adhesive and certain carbonaceous soils where aqueous chemistry is less effective.
The appropriate family is a shortlist, not a conclusion. The final choice is confirmed against your boards, your residues and your equipment.
Recommended Cleaning Process
- Residue and substrate review. You describe the flux system or residue and the materials in contact with it, and send assembled boards or component samples where possible.
- Chemistry shortlisting. We propose one or two candidate formulations and explain the reasoning for each — including why a stronger product is being ruled out.
- Sample test on your boards. Cleaning performance is trialled against your actual residue, footprint and components, not a laboratory substitute.
- Process parameter setting. Concentration, temperature, contact time, mechanical energy, rinse stages and drying method are defined for your equipment.
- Compatibility and ionic cleanliness review. Effect on copper, plating, solder mask and connectors, plus rinse water quality, residue carry-over, disposal and bath-life considerations, is reviewed before scale-up.
- Production supply. Once the process is fixed, we support repeat orders with a consistent formulation and documentation in English.
This sequence is a decision framework, not a universal cleaning recipe. Final chemistry and parameters are confirmed by sample testing and remain specific to your boards, residues and equipment.
Key Applications
Semiconductor packaging and chip assembly
Flux, solder paste and post-soldering residue removal on assembled packages, leadframes, discrete devices, power modules and flip-chip assemblies, where copper corrosion and oxidation must be controlled during and after cleaning.
PCB and electronics assembly
Rosin and no-clean flux removal, solder residue and handling-soil cleaning on rigid and metal-core boards, matched to the flux chemistry actually used on your reflow and wave-solder lines, and to the coating or test step that follows.
Solder paste stencils and screen frames
Solder paste and flux removal from stencils, screen frames and mesh, where aperture cleanliness determines paste release and print quality on the next run.
Copper, leadframe and connector surfaces
Oxide-film and tarnish removal with controlled passivation on copper surfaces, leadframes and connectors, to keep surfaces solderable and conductive between process steps.
Recommended Formulations for Electronics & Semiconductor Manufacturing
Based on our formulation library, the following grades cover the majority of electronics and semiconductor cleaning duties. The operating windows below are indicative starting points from our supplier’s product documentation — final parameters are fixed during sample testing on your boards and equipment.
| Grade / Series | Target Contaminants | Substrate Suitability | Operating Concentration | Wash Mechanics |
|---|---|---|---|---|
| Cleanova W1023 Chip & Semiconductor Cleaner | Flux, solder paste residue, dust, fingerprints | Copper leadframe, package substrates, assembled boards | 5–10 % in water · 50–60 °C | Ultrasonic immersion |
| Cleanova W102 Flux & PCB Cleaner | Rosin and no-clean flux, solder residue | Rigid and metal-core PCB assemblies | 30–100 ml/L · 55–65 °C | Ultrasonic / immersion |
| Cleanova W411 Flux Remover | Flux and rosin residue on electronics assemblies | Electronics assemblies and metal frames | 30–100 ml/L · 55–65 °C | Ultrasonic / immersion |
| Cleanova W462 Photovoltaic & Semiconductor Cleaner | Solder and process residue on semiconductor and PV components | Semiconductor and photovoltaic components | 30–100 ml/L · 55–65 °C | Ultrasonic / immersion |
| Cleanova W419 Stencil & Screen Frame Cleaner | Solder paste, flux and mesh residue | Stainless stencils, screen frames and mesh | 30–100 ml/L · ambient | Ultrasonic / immersion |
| Cleanova W1020M Copper Anti-Tarnish Cleaner | Oxide film, tarnish, oil film and carbon deposits | Copper surfaces, leadframes, connectors | 20–80 ml/L · ambient | Ultrasonic / immersion |
Information Required for Formulation Recommendation
- Substrate material and surface condition
- Flux system or residue type and how it was applied
- Cleaning method and existing equipment
- Required cleanliness level or the next process step
- Constraints on temperature, rinse water and materials compatibility
- Order volume expectation and destination country
Frequently Asked Questions
Can your chemistry remove flux residue from assembled boards without damaging components?
Yes, within limits. Flux and solder-paste removal on assembled boards is a normal duty, but the acceptable chemistry depends on what else is on the board — bare copper traces, plated finishes, solder mask, connectors, plastics and conformal coatings all restrict alkalinity, temperature or contact time. The formulation is selected against those restrictions and then confirmed on your actual boards and flux, since rosin, no-clean and water-soluble flux chemistry behave differently.
Do you clean no-clean flux, or only traditional rosin flux?
Both, but they are different problems. No-clean flux leaves less visible residue yet can still affect conformal coating adhesion and long-term reliability, and it is often harder to dissolve than rosin. We match the formulation to the specific flux system your line uses, which is why we ask for the flux type and, where possible, a sample of an assembled board.
Will the cleaner attack copper traces or solder mask?
Copper and solder mask are usually the limiting materials rather than the residue. The recommendation therefore moves toward neutral or mildly alkaline chemistry with controlled temperature and contact time, and passivation considerations where bare copper is exposed. Compatibility is confirmed by trialling the candidate formulation against your own boards before production.
Can you clean solder paste stencils and screen frames?
Yes. Stencil and screen-frame cleaning is a distinct duty from board cleaning, because paste release and print quality depend on fully clear apertures and mesh. We select chemistry for solder paste and flux removal on stainless stencils and frames, and review the rinse and drying stages with you, since those stages usually determine the result.
What information do you need before recommending a formulation?
The substrate material and surface condition, the flux system or residue type and how it was applied, your cleaning method and equipment, the required cleanliness level or the next process step, and any constraints on temperature, rinse water or materials compatibility. Photographs of the assemblies and of the current process help considerably.
Do you provide technical documentation in English, and can you guarantee a cleaning result?
Technical documents and product information are prepared in English for export customers, alongside labels and packaging suited to the destination market. A cleanliness or ionic-contamination result cannot be guaranteed from a formulation description alone — performance depends on your boards, residues, equipment and process parameters, which is why we confirm recommendations through sample testing rather than promising an outcome in advance.
