Solar Flux – No Clean-Flux-EO-S-009

No Clean Solar Flux – EO-S-009

Specially formulated for the solar industry, EO‑S‑009 is an alcohol‑based flux, halogen‑free, classified ORL0 according to IPC J‑STD‑004. Its solids content is low (approximately 1.8 %). The activators are designed for the high temperatures encountered during the soldering of photovoltaic modules. It is suitable for wave, selective and manual soldering, as well as for tabber & stringer processes.

• SOLAR FLUX-EO-S-009 is a professional no-clean flux engineered specifically for soldering processes in solar module manufacturing.
  It ensures excellent solder wetting, minimizes oxidation, and provides stable electrical connections without leaving harmful residues on photovoltaic cells.
• Solar / PV Cell Oriented DescriptionA flux for the solar industry (Solar Flux) formulated for soldering photovoltaic modules, tabber & stringer ribbons and cell interconnections, compatible with automated stringing/tabbing lines used for TOPCon, HJT, XBC or tandem cells.

Chemical insight
The dicarboxylic acids used effectively remove oxides without attacking sensitive cell materials. The resin additive ensures uniform wetting while keeping residues dry and non‑sticky.

What this means for you – concrete benefits for your process and quality (added value of EO‑S‑009)

• TOPCon cell protection: halogen‑free – no corrosion of contacts nor degradation of the tunnel oxide.
• No bridging: low solids content and non‑sticky residues, ideal for multi‑busbars.
• Reliable wetting: removes oxides even on stored ribbons.
• Encapsulation compatibility: transparent, non‑conductive residues, suitable for EVA and POE.
• Versatile process: can be used in spray application with standard settings and preheating.

• Solvent base: isopropyl alcohol
• Solids content: low (< 2 %)
• Activator system: dicarboxylic acids with resin additive
• Halogen‑free
• Classification: ORL0 / NO CLEAN

• Solar module production lines
• Tabber and stringer machines
• Tabbing ribbon soldering
• Photovoltaic cell interconnection

Appearance: colorless to slightly yellow transparent liquid, based on short-chain alcohols, with a solids content of approximately 1.8% (1.7–1.9%), density 0.790–0.796 g/ml at 20 °C, acid number 14–18 mg KOH/g.

• No-clean formulation (no post-cleaning required)
• Reduced oxidation during soldering
• Improved solder wetting and uniformity
• Safe for photovoltaic cell surfaces
• Ideal for high-speed mass production
• Excellent thermal and chemical stability

complex of carboxylic and di carboxylic acids with a special resin additive, 0% halogens, VOC ~98%, flashpoint 12 °C, shelf life 12 months when stored cool and dry, completely free from corrosive action for the long-term reliability of PV interconnections (glass glass modules, bifacial, etc.).

Versatile OPS compatible flux, delivering very good results in manual, wave or selective soldering, as well as for cable assembly / wire tinning, following the rule of minimal deposition to limit residues while ensuring optimal wetting of tinned copper ribbons and silver busbars.

• Higher electrical joint efficiency
• Reduced production defects
• Improved solar module quality
• Lower cleaning and maintenance costs