YIVAHUBJiangmen Sanitary and Hardware: Casting, Plating and What Salt Spray Really Proves
2026-11-08 · YIVAHUB Team
In Jiangmen the product you see is a faucet. The product you are actually buying is a process chain: casting, machining, polishing, plating, assembly, test. Price and failure both live in that chain rather than in the design, and most specification arguments here turn out to be a question about one of its five steps.
The body material is the first question, and it decides which markets are open to you before anything else does. Brass is the standard and it is not one material: leaded brass machines easily and is cheap, while the low-lead and dezincification-resistant grades cost more and are what a potable-water market requires. Zinc alloy is the other common body material and is genuinely cheaper, but it cannot be sold as a drinking-water contact product in the markets that regulate that, and it corrodes in a way brass does not. So the cheapest body forecloses your market. Ask for the grade in writing, and if the answer is vague, that is the answer.
Machining tolerance is invisible and it decides whether the cartridge seals. The sealing faces and the thread are cut on a CNC, and the tolerance there determines whether the ceramic cartridge seals under pressure for a decade or weeps in year two. This is not something a buyer can inspect visually, which is why it belongs in the order as a stated tolerance and why the water test is the only practical proof. A supplier who can tell you the tolerance is a supplier who machines in-house.
Polishing is the labour step, and it is the reason two visually identical faucets cost different amounts. Hand polishing produces the deep, even lustre that sells a fixture at a premium, and it is slow and skill-dependent. Machine polishing is faster and flatter. The difference is visible side by side and nearly invisible in a catalogue photograph, so a quote materially cheaper than the others in the same shape is usually a quote for machine polishing. Decide which your price point needs before comparing quotes, or you are comparing two different products.
Plating thickness is the number that decides salt spray performance, and it should be specified in microns. A typical chrome finish is nickel followed by chrome, and the nickel layer is what does the corrosion work. A standard decorative spec might be five to ten microns of nickel under a fraction of a micron of chrome, passing a day or two of neutral salt spray. An export sanitary specification commonly asks for eight to twelve microns of nickel with a thicker chrome layer, and targets a hundred to two hundred hours. Premium programmes ask for more than that. The instruction to give a supplier is therefore not good quality plating but layer thickness in microns, plus the salt spray hours with the standard named.
Salt spray is the acceptance test of this belt, and it is worth knowing what it does and does not prove. The test is run to a named standard, neutral salt spray being the usual one, and the result is reported as hours to a defined failure criterion or as a rating on an assessment scale. It compares finishes under an accelerated condition. What it does not do is predict ten years in a bathroom, because it does not reproduce soap, cleaning chemicals or abrasion. Read the report for three things: the standard, the hours, and which surfaces were assessed, because a polished face and a cut edge behave differently and a report on the easy surface is not evidence about the difficult one.
The cartridge is the highest-value component in the product and the most common source of complaints. There are a few well-known cartridge makers and a long tail of copies, and the difference is measurable: the cycle rating, the number of open-close cycles the cartridge is tested to before it is allowed to leak. A cartridge rated to a few hundred thousand cycles is a different product from one rated to half a million, and the price difference is a small fraction of the faucet. Ask which cartridge is fitted and its cycle rating, and put both in the order, because a cartridge swap after the first shipment is the most common silent downgrade here.
Water-contact certification is the legal gate, and it is per model, which is why the body material matters so much. In the United States, plumbing products intended for drinking water must meet a lead content limit expressed as a weighted average across wetted surfaces, and are certified under the drinking water component standards, with an extra state-level layer for lead. In the European Union the drinking water framework applies, alongside the product standards for mechanical and thermostatic mixing valves. The United Kingdom works through its own water regulation approval scheme, Australia through its watermark scheme, and the Gulf states through their own conformity marks. Certification is granted per model, and a model family that shares one body and differs only in handle or finish can often be certified together, which is a design decision worth making deliberately.
Finish colour is a process, not a shade, and the durable colours are a different technology. Chrome and nickel are electroplated. Black, gold, gunmetal and rose-gold finishes are usually applied by physical vapour deposition, more abrasion-resistant and considerably more expensive, or by plating plus a lacquer, cheaper and less durable. Matte and brushed finishes add a further step and are harder to touch up. Specify the process rather than the colour name, because the same colour name from two suppliers can be two different technologies with a large difference in service life.
Ask whether plating is in-house, because that answer is your lead time. Polishing and plating are the capacity constraint in this belt, and they are the steps that cannot be expanded quickly. If plating is subcontracted, the factory does not control your schedule and its lead time is really somebody else's queue position. Ask how many plating lines it operates, whether they are rack or barrel lines, and whether the finish on your order is plated in-house. Then put the agreed lead time in the order in writing, because in peak season the plating queue is the number that slips.
Write the purchase order so that every step of the chain is named, and test every unit before it ships. Body material and grade. Cartridge make and cycle rating. Machining tolerance on the sealing faces. Plating thickness in microns with the salt spray standard and hours. Finish process. Certification route by market and model family. And a water test on every unit at a stated pressure with a handle cycle check, with the record travelling with the shipment. Those eight lines separate a container of faucets from a container of warranty claims.
Where this lands with us. For sanitary and hardware we fix the body material and the market first, because those decide whether the product is sellable at all, then specify plating in microns, cartridge by cycle rating and the salt spray requirement with the standard named. Send the product, the quantity and the destination, and the process chain and its test requirements come back with the quote.