Brighteners improve deposit appearance and leveling in the plating bath. They do not degrease parts, sequester hardness, or control spray-washer foam. Specify named grades from brightener additives against metal system and current density—after cleaning and complexing briefs are locked under metal chemicals.
What Brightener Additives Must Do
Decorative and functional electroplating sell appearance and deposit quality as much as thickness. Brightener additives enhance brightness and luster, support leveling, improve throwing uniformity, and help reduce surface defects when the bath chemistry and surface preparation are already sound. That brief lives on brightener additives inside metal chemicals.
Indian plating lines often fail first on soil left after cleaning, or on hardness and metal-ion drag that cloud rinses—not on a missing millilitre of brightener. Fix the process chain in order: clean → rinse → activate → plate with brightener → rinse. Do not dose brightness into a dirty or poorly complexed bath and expect a catalogue panel.
Published Grades — EH-158, BNE-12, BNE-24
Use only grades listed on the product table. Suggested dosage on the page is typically 2–10 g/l; re-optimize for your acid, temperature, and current density.
| Grade | Description (as listed) | Listed function |
|---|---|---|
| EH-158 | POE-15 isooctanol | Basic brightener — acidic zinc, tin |
| BNE-12 | POE-12 beta naphthol | Basic brightener — acidic zinc |
| BNE-24 | POE-24 beta naphthol | Brightener in electroplating |
Appearance, activity %, pH of dilute solution, viscosity, and cloud point are on the product page—use them for incoming QC, not as a substitute for Hull-cell or production-panel screening.
Brighteners vs Cleaning Surfactants
Pre-plate spray and tunnel washers need low foam under shear. Conventional high-foam ethoxylates flood sumps; end-capped and EO/PO low-foamers wet and degrease without locking the washer. That is a cleaning brief—see spray-washer low-foam metal cleaning surfactants and low-foam surfactants. A brightener will not remove drawing oil; a low-foam cleaner will not level a zinc deposit.
Brighteners vs Complexing and Chelating Agents
Metal complexing agents control metal-ion activity and interference in process liquors. Chelating agents sequester hardness and dissolved metals that otherwise scale nozzles, dull rinses, or contaminate plating. Selection between HEDTA-type and glucoheptonate-type packages is covered in HEDTA vs glucoheptonate selection. Keep these RFQs distinct from EH-158 / BNE grade requests even when the same plant buys all three families.
Chassis Decision Map
| Brief signal | Start here | Do not assume |
|---|---|---|
| Acidic zinc / tin brightness or leveling | EH-158, BNE-12, BNE-24 per listed metal scope | That one grade covers every metal and acid type |
| Spray / tunnel washer foam or soil | Low-foam cleaning path | That brightener dose cleans the part |
| Hardness / metal-ion interference | Complexing / chelating path | That sequestering equals brightness |
| Dull deposit after poor rinse | Fix cleaning and rinse quality first | That more brightener hides soil |
How to Specify with Esteem
- Name electroplating / metal finishing brightener (not cleaner, not chelant).
- State metal system (e.g. acidic zinc, tin), temperature, and current density window.
- Rank brightness vs leveling vs throwing power; note impurity or drag-out issues.
- Confirm cleaning and complexing/chelating packages are already approved or list them as open.
- Request EH-158, BNE-12, and/or BNE-24 from brightener additives under metal chemicals—named samples only.
Related: metal complexing agents, chelating agents, spray-washer low-foam surfactants.
Contact Esteem for brightener screening, or custom synthesis when the brief needs a non-catalogue cut.