Fengfan CAS 49625-94-7 ZPS Sodium 3 Benzothiazol 2 Ylthio 1 Propanesulfonate Copper plating

Product Overview

This product — sodium 3-(benzothiazol-2-ylthio)-1-propanesulfonate, CAS 49625-94-7 — is a water-soluble organic sulfonate supplied as a light yellow powder. It is an intermediate, not a ready-made bath: plating shops and additive formulators buy it to build a brightener system or to top one up, and it serves a metal plating process from two quite different directions — as a brightening component in acid copper, and as a stabilizer in baths that deposit precious metals without an external current.

Two duties, one product

On the copper side it is a brightening component, added to an acid copper bath where it works together with the polyethers and wetting agents that carry the deposit and keep the surface film even. On the precious-metal side it has nothing to do with appearance: it holds the bath back from decomposing on its own, which is one of the most common ways a precious-metal bath fails. Baths used for the electroless plating of gold and other precious metals are the classic case. One product covering both duties is convenient for shops that run copper and precious-metal work side by side, and it avoids keeping two similar-looking containers apart in the store.

How it is dosed

The powder is weighed in small amounts and added as a stock solution, the way brightener components are normally handled in the process of electroplating, rather than charged as a bulk bath salt at make-up. The full chemical and physical data are listed in the table below. Two things are worth settling before the first production batch: the addition level for your particular bath, and whether the carrier and wetting agents you already run are the ones this product is meant to work with.

Specifications

Brightener Role in Acid Copper

• Bright, ductile copper — run together with polyethers and wetting agents, it turns a dull, brittle copper layer into a bright one that still has give. Ductility is the part that matters on parts that are bent, crimped or thermally cycled after plating; a bright but brittle deposit fails at the first forming operation.
• Where it sits in the brightener system — an acid copper bath is a balance of a carrier, usually a polyether, a wetting side, usually a non-ionic surface active agent, and the brightening component. This product is the brightening component: it is the one you adjust when the deposit needs more shine or more give, while the carrier and the wetting agent stay where they are.
• Maintained, not charged once — brightness is something you keep, not something you add at make-up and forget. Additions follow consumption, then a panel check, then an adjustment. Shops that treat the brightener as a fixed charge usually spend the following weeks chasing dull deposits.
• Made for shops already running copper — barrel or rack, decorative or functional, the product is a powder that goes into a stock solution and is dosed in small amounts, so it slots into an existing addition routine instead of replacing it.
• Read the panel, not the label — in a metal plating process the panel tells you more than the container does. Burning at the high-current edges points at the carrier; dullness in the recesses points at the brightener-to-carrier balance. Keeping those two symptoms apart saves a lot of additive and a lot of arguing.
• What it is not — it is not a bulk copper salt, not a pH adjuster, and not a stand-alone brightener that works without a carrier; in electroless plating its role is stabilization, not brightness. Treating it as any of those three gives a poor result and blames the product for it.

Stabilizer for Precious-Metal Deposition

Wild deposition, and why a stabilizer exists

In the chemical deposition of precious metals the bath is willing to plate out on almost anything it touches. Wild deposition is what happens when it does: metal forms on the tank wall, on the filter housing, on pump parts and on particles suspended in the solution instead of on the work. The bath loses metal to the wrong surfaces, the solution clouds, roughness appears on the parts, and in the worst case the bath has to be dropped. A stabilizer is the component that holds the bath just below that threshold, so deposition stays on the parts. Running an electroless plating process without one is a bath waiting for an excuse.

A narrow window, set per bath

A stabilizer is dosed in small amounts and its working range is narrow: too little and the bath decomposes, too much and deposition slows or stops altogether. That is why the addition is set against the specific bath — metal concentration, temperature, pH and bath loading — and confirmed on test parts before production is released. The same drum can be right for one bath and wrong for a second bath at twice the loading, so the number has to come from your own line rather than from a neighbour's process sheet.

A note on precious-metal baths

Baths used for gold plating and other precious metals are the case this duty was written for: the metal is expensive, the bath volume is small, and one decomposition event costs more than the chemistry. Confirm the addition with us before the first make-up — tell us the bath type, the metal, the operating temperature and the loading, and we will give you a starting point to test rather than a figure to trust.

Bath Make-Up and Dosing

1. Confirm the addition level before anything is weighed. Send us the bath type, the carrier and wetting agent you run, the operating temperature and the current density range, and we will give you a starting figure for your own bath rather than one copied from another line.
2. Make a stock solution in clean water. Powder goes into water first, not straight into the tank: a stock solution doses evenly and keeps undissolved particles off the bottom of the bath. In the process of electroplating, a brightener that never fully dissolved is a brightener that never worked.
3. Add under normal agitation and filtration, in small increments. Hold the wetting side steady while you adjust the brightener — if the surface active agent changes at the same time, you will not know which change produced the result.
4. Re-check pH and temperature after the addition. The product's own solution is acidic, so a larger addition can shift a small bath; check the value your process sheet calls for and correct it before plating resumes.
5. Plate a test panel across the current density range. A panel takes minutes and shows the bright range, the dull edges and the burning in one look, which makes it the fastest control step in a plating process.
6. Log the batch number and the addition, and adjust the next addition from the log rather than from the datasheet. What the bath actually consumed is the only figure that describes your line.

Storage and Shelf Life

• Keep the container closed — the powder takes moisture from the air. A container left open cakes at the surface, and a caked powder then weighs out unevenly and dissolves slowly, which shows up as inconsistent brightness rather than as an obvious fault.
• Cool, dry and out of direct sunlight — a storeroom, not the line side.
• Store away from the tanks — a shop that runs a metal plating process is a warm, humid, acid-laden place, and none of that suits a water-soluble powder. Keep the container off the floor and out of the splash zone.
• Mix only what you need — a stock solution made for the next few days of additions stays clean and easy to dose; a container of solution standing for weeks invites contamination and drift.
• Segregate and label — keep it away from food, feed and strong oxidisers, and keep the product name and batch number on the container at all times.
• Rotate stock — use the oldest batch first and write the receipt date next to the batch number, so nothing sits forgotten at the back of the store.

Ordering and Delivery

1. Tell us about the bath: whether you are running acid copper or a precious-metal deposition bath, the carrier and wetting agents already in the tank, and the problem you are solving. That is what we use to confirm the grade and the starting addition.
2. Confirm the quantity. Minimum order quantity varies by chemical and is confirmed with our sales team per order. If you want to run a trial first, ask your sales contact about sample availability.
3. Packing: 10 kg/box; 25 kg or 50 kg/bag; 20 kg/25 kg/30 kg/200 kg/drum; 1,000 kg/IBC drum.
4. Payment: 100% T/T in advance.
5. Lead time: 2 weeks.
6. Shipping: per the terms agreed in the current contract.
7. Documents: an inspection certificate is issued after delivery stating the batch number and warranty period.
8. If this component is not the right fit, ask for the wider range — zinc brighteners, nickel intermediates, aluminum anodizing chemicals and surface treatment equipment — and we will point you to the product that belongs in your bath instead.

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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