Fengfan CAS 3918-73-8 Pyridinium Hydroxyl Propyl Sulphobetaine PPSOH (solid) C8H11NO4S

Product Overview

Pyridinium hydroxyl propyl sulphobetaine (PPS-OH) is a pyridinium betaine supplied as a white crystalline powder at ≥78% assay by UV. It is a strong leveling agent for electrolytic nickel, and it normally goes into a tank indirectly: formulators use it as one of the active raw materials in a brightener concentrate, and the concentrate is what a bright nickel plating line doses.

The job it does is leveling at high current density — the edges, the faces closest to the anode, the corners of a recess, the places where a deposit turns rough, burnt or nodular first. That is the part of a metal plating process where appearance is decided, and where a leveler earns its place in the formulation.

The solid grade carries no water. A kilogram delivers close to twice the active betaine of the 40% liquid version of the same chemistry, so freight weight and warehouse space per active unit come down. The trade is a make-up step: the powder has to be dissolved and blended before it can be dosed anywhere. Shops that already prepare their own brightener concentrates gain the most from that trade; a line that only buys ready-to-use liquids is usually better served by the liquid grade.

Specifications

Solid Form & Solution Make-Up

• Calculate on active content, not on drum weight. The assay is ≥78% by UV, close to twice the active betaine of the 40% liquid grade, so a formulation written around the liquid has to be recalculated rather than copied kilo for kilo.
• It dissolves to a clear 50% solution at 20 °C. That is the strength most formulators make up before blending; warm demineralised water and steady agitation shorten the time and keep powder from sitting undissolved at the bottom of the tank.
• Mildly acidic once dissolved. A 50% solution reads between pH 3.0 and 6.5. Note the figure on the batch sheet at make-up so the next lot is compared on the same basis instead of against memory.
• Free-flowing crystalline powder. White and granular, it scoops and weighs cleanly. Keep the drum closed between weighings so it stays that way through a long production week.
• Dust is the handling issue, not spillage. Treat it like any fine chemical powder at the weighing station: local extraction, a mask for the operator, and a lidded container between uses.
• You set the stock strength. Because the water is added at your site, a concentrate can be made stronger than a ready-made liquid allows; the practical limit is what stays stable in your own blending tank.
• What it does on an electro nickel plating line. Once in the bath the betaine works at the high current density end. The low current density areas belong to the other brightener components, so the balance of the whole package still decides the final appearance.
• It is a component, not a complete brightener. On its own it will not carry a bath; it is one part of a package that is formulated, trialled and topped up as a single system.

Leveling Behaviour in the Bath

Brightness and leveling are separate jobs, and this grade is bought for the second one. A brightener makes a deposit reflect light; a leveler changes the way the nickel fills the profile of the part, so polishing scratches, grinding marks and substrate roughness are progressively covered instead of being reproduced faithfully in metal. On a bright nickel plating line the difference shows up as fewer hours at the buffing wheel and a more even appearance from part to part.

The effect concentrates at high current density. In a nickel plating bath the additive sits at 25–250 ml/L, a deliberately wide band, because the right point inside it depends on the geometry being plated, the agitation and the rest of the brightener package. Start at the low end, look at the high current density band on a test panel, and raise the addition only while the improvement is still visible on that band.

Two practical notes come with the claim. First, a leveler does not replace the hardness of the deposit: where a part also carries a hard nickel top layer, the leveler gives that layer a uniform base to build on, and nothing more. Second, every polishing step taken out of the plating process is labour, consumable and reject risk removed from the route, which is usually where the case for the addition is actually made.

Applications

• Additive formulators. Companies that build their own brightener concentrates buy the betaine as an active raw material and blend it into a package they sell or run in-house.
• Decorative bright nickel plating on steel, brass and zinc die-cast. Handles, fittings, trim and housings where the high current density faces are the ones a customer sees first.
• Automotive trim and sanitary ware. Parts judged under grazing light, where roughness on a curved face is obvious even after polishing.
• Connector shells and electronic hardware. Nickel underplate where a level deposit keeps the following layer uniform across the rest of the metal plating process.
• Barrel loads of small parts. The same effect applies, though contact points and tumbling change where the high current density sits on the load.
• Shops that top a bright layer with wear-resistant nickel plating. A level underlayer gives the hard top coat an even foundation instead of following the substrate profile.
• A nickel plating company running several bath types. One raw material that fits more than one brightener formulation keeps the raw-material list and the stock count short.
• A new part being transferred onto an existing line. When the process of electroplating is being dialled in, the leveler is often the last component tuned after brightness is settled.

Building the Brightener Additive

1. Read the batch certificate before you weigh anything. The assay on the drum is what the calculation should use, so record the batch number and the figure on your blending sheet.
2. Convert the recipe to active content. If the formulation was written around a 40% liquid, multiply through instead of substituting weight for weight.
3. Dissolve to your chosen stock strength. Add the powder to stirred, preferably warm, demineralised water; 50% is a practical stock that stays clear at 20 °C.
4. Check the pH of the stock before blending. A 50% solution reads 3.0–6.5; if your concentrate sits at a different pH, change the order of addition rather than the ratio.
5. Blend, label and retain a sample. Mix into the brightener concentrate, mark the container with the raw-material batch number, and keep a retained sample for the trial.
6. Qualify on a panel before production. A Hull cell plate across the current density range is the standard way to see what a change will do to a metal plating process before it reaches the tank; compare the high current density band against the additive you run today.
7. Scale up and track consumption. Dose the additive at 25–250 ml/L, log the addition against area plated, and keep topping up from the same lot while the process settles.

Packing, Storage & Delivery

Technical Support & Model Matching

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.

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