Fengfan Alkylphenol Polyoxyethylene OS-8 is a non-ionic emulsifier made for potassium chloride zinc plating. Chemically it is a polyether compound, supplied as a colorless to yellowish viscous liquid with a solid content of at least 80% and a pH of 5.0 to 8.0 in 1% water solution. It is a surface active agent, not a metal salt and not a brightener, and it is bought as one defined component of a bath make-up rather than as a ready-blended package whose composition shifts from drum to drum.
In a working potassium chloride zinc bath the grade is added alongside the high-temperature carrier. That is where it earns its place among the acid zinc plating chemicals on an electroplating line: the carrier and the brightener are held in dispersion through the electrolyte instead of separating, so the organic package stays available at the surface across the whole plating cycle rather than floating out or plating onto the tank wall.
The same dispersing behaviour carries into electroless plating, which is why plants that run a zinc line and a nickel line can hold one drum instead of two. It is a small addition that never appears in the deposit, but its absence shows up in the finish long before it shows up on an analysis sheet.
| Product | Fengfan Alkylphenol Polyoxyethylene OS-8 |
| Chemical name | Polyether compound |
| Chemical type | Alkylphenol polyoxyethylene |
| Ionic character | Non-ionic |
| Physical form | Colorless to yellowish viscous liquid |
| Solid content (%) | ≥80.0 |
| pH value (1% in water) | 5.0~8.0 |
| Function in the bath | Emulsifier for the carrier and brightener in acid zinc electroplating baths |
| Main bath system | Potassium chloride zinc plating |
| Typical dosage | 1–2 g/L |
| Addition practice | Charged together with the high-temperature carrier |
| Also used in | Electroless nickel plating process for aluminum, copper and steel |
| Packing | 200 kg per drum |
The grade is also used in electroless nickel plating, and not only as a zinc additive. In that bath the emulsifier keeps the organic constituents evenly distributed through the solution, which is what allows nickel to build at a consistent rate over the whole part instead of thickening on edges and starving recesses.
On aluminum the effect matters more than on steel. The natural oxide film makes an even start harder to achieve, and a bath whose organics are properly dispersed produces a smooth, uniform coating that holds its appearance after finishing. The visible result is a consistent deposit thickness across the part and a level surface, rather than a coating that has to be polished back into shape.
If you already run an electroless nickel plating process next to a zinc line, this is the kind of grade worth holding in common stock: one emulsifier, one dosage logic, two baths.
Non-ionic chemistry is the reason this emulsifier survives a potassium chloride bath. Those electrolytes carry a heavy load of chloride and zinc, and their composition shifts as the bath is worked and topped up. A non-ionic surface active agent does not depend on ionic strength to stay in solution, so it keeps the carrier dispersed at the beginning of the bath's life and at the end of it, which is exactly where ionic emulsifiers tend to drift.
The same property makes the grade portable between processes. It does not need one particular electrolyte to function, so it can be used in an acid zinc bath, carried into electroless plating, or used wherever a carrier has to be held in suspension in a metal plating process. In practice you choose the emulsifier for the carrier system it has to hold, and the ionic character decides whether it will still be working after a week of production.
That portability also simplifies stock. One grade covers more than one bath type, the dosage logic does not change when you move it, and a plant running several lines is not chasing a different emulsifier for each of them. Confirm the fit against your own carrier and brightener system before you commit a full tank.
| Item | What it covers |
|---|---|
| Safety data sheet (SDS) | Composition, handling, storage, transport and first-aid information; ask your sales contact for the current version |
| Release check | Solid content and pH verified against the values in the specification above before the batch is released |
| Batch traceability | Batch number printed on the drum and recorded against the delivery, so a query can be traced to one production lot |
| Production standard | Manufactured under our enterprise standard, with clean production verification, safety production standardisation and 6S site management |
| Regulatory statements | Confirmed per order — tell us which regulation your inward approval needs and we will state what the current batch documentation supports |
| Technical data | Properties, dosage and application notes for your process file, available on request |
Fengfan International Trade is the export arm of Wuhan Fengfan Electrochemical Technology, a surface finishing company founded in 1984. Four decades in one industry shapes how a question gets answered here: we ask about the electrolyte, the substrate and the defect before we talk about drums.
The range covers the process rather than a single step — brighteners and intermediates for alkaline and acid zinc, zinc-nickel alloys, copper, bright and electroless nickel, tin, silver, gold and palladium-nickel, passivation and chromium mist control, the aluminum anodizing line, electrophoretic coatings, nano protective agents, and the surfactants and chemical intermediates behind them. That breadth is why a plating shop can kit a new line from one supplier instead of five.
Why buyers choose us over another supplier comes down to three things. The products are made under an enterprise standard with clean production verification and 6S site management, so a grade behaves the same from drum to drum. The technical answers come from people who work with these baths rather than from a catalogue. And the direction of the range is towards formulations that do the same job with less burden on the workplace and the effluent — non-ionic emulsifiers, cyanide-free processes, trivalent passivation. If your bath is not standard, tell us the parameters and we will say plainly whether this grade is the right fit or whether another intermediate in the range suits you better.
OS-8 significantly improves the adhesion of the electroplated layer, building a stronger bond between the plating and the base metal underneath. That same treatment supports corrosion resistance, which makes it a practical choice for parts that will be exposed to harsh environments over their service life.
OS-8 is formulated to be non-toxic and to work within environmental standards, so it stays safer for the people handling it and for the environment around the line. Ask for the compliance documentation that applies to your market so you can confirm the exact standards and requirements it meets before you order.
Choosing the right match is where most sourcing decisions stall. As a trading supplier, we keep one point of contact from first enquiry to after-sales: tell us what you are making and the conditions you work under, and we shortlist the closest matches from our supplier network, compare specifications and arrange samples before you commit to a bulk order. If something does not behave as expected, we work with the supplying partner on the cause and a practical fix, and stay with the case until it is settled. Email, WeChat or WhatsApp enquiries get a reply within 24 hours.
It holds the high-temperature carrier in dispersion. In a potassium chloride zinc bath the carrier and the brightener have to stay evenly distributed through the electrolyte for the plating cycle to behave predictably; without an emulsifier they can separate, and brightness control drifts with them. The emulsifier itself leaves nothing in the deposit — it is there to keep the rest of the package working.
An emulsifier. The carrier and the brightener are separate components of the package and this grade does not replace either of them. It is a non-ionic surface active agent whose single job is to keep the carrier dispersed so the carrier and brightener can do their own work at the surface.
The recommended use is together with the high-temperature carrier, which is where the strong emulsification effect in acid zinc comes from. If your line runs a different carrier system, send us the bath composition and the carrier you use, and we will tell you whether this grade fits it or whether another intermediate in the range is the better match.
Yes. It is also used in electroless nickel plating, where the same dispersing behaviour keeps the bath's organic constituents evenly distributed and supports a consistent deposit thickness across the part. The aluminum case is where buyers notice it most: electroless nickel plating on aluminum is harder to start evenly because of the natural oxide film, and a properly dispersed bath gives a smoother, more uniform finish. The same behaviour applies in electroless plating more generally, and in any metal plating process where a carrier has to be held in suspension.
It is the pH of a 1% solution of the product in water, not the pH of your plating bath. It tells you what to expect when the drum is opened and how the material behaves when it is diluted into the make-up, and it is one of the values to check if a batch ever looks different from the previous one.
Most of what arrives in the drum is active material rather than water or solvent, so the 1–2 g/L addition refers to a concentrated product. Weigh the addition rather than estimating it by eye, and if you want to confirm the batch, the solid content and pH on the specification are the two figures to check first.
Check the emulsifier addition and the state of the carrier first. A starved emulsion shows up as uneven brightness and leveling across the part before it shows up in the bath analysis, because the carrier is no longer reaching the surface evenly. If the carrier is fully dispersed and the addition matches the bath volume, then move on to the brightener and the rest of the package.
