1. A written process specification, not a product brochure
Ask the supplier to restate your process in their own document, and check that it names the things you actually coat. For the slit coating equipment PowerDe lists for perovskite and related thin-film R&D, a usable specification should cover the substrate you run, the coating solution or ink, target wet and dry film thickness, line speed, web width, drying or curing approach, and the atmosphere the process needs. PowerDe also lists glove box spin coating equipment for the same field, which is worth noting here: a supplier offering both roll coating and spin coating for thin-film research usually has process engineers, not just a machine catalogue. If the document contains only machine features and never mentions your material, treat it as a sales sheet.
2. Test coupons made on the machine, not on a sample bench
Request coupons produced on the exact unit you will receive, with your own substrate and your own formulation, and measure them yourself. Uniformity across the web width, edge behaviour, and how the film looks after drying tell you more than any datasheet. Where the thin-film line will continue downstream, verify the coating against the next step as well, since PowerDe's thin-film series also includes laser cutting and roll-to-roll magnetron sputtering machines, and a supplier integrating those steps can run the combined sequence during your trial.
3. A parameter sheet with stated tolerances and units
Insist on a table where every figure has a unit, a test condition, and a range. Claims without conditions are the first thing to disappear when output drifts. Where the vendor publishes figures, ask whether they were measured on the delivery configuration; where a value is not published (a coating window, a downtime figure, a consumable life), ask for it in writing rather than assuming it exists. A supplier that answers "not published, we will measure it for your case" is more dependable than one that answers instantly.
4. Factory acceptance criteria you can repeat at your plant
Ask for the acceptance protocol before the machine ships: which recipes are run, how many consecutive runs, what is measured, what counts as a pass, and who is present. The protocol should be reproducible by your own engineers with your own materials, otherwise a passed test at the factory proves nothing about your line. Keep a copy in the contract, not in an email thread.
5. Interfaces and utilities declared up front
Get the machine's real footprint and demands: power supply, compressed air, exhaust, inert gas if the process requires it, floor space including doors and access aisles, and the control system's data outputs. A coating tool that cannot log its own parameters makes root-cause analysis guesswork later, so specify what data the machine records and in what format you receive it.
6. Spares, consumables, and a named service path
Ask for the wear-part list with part numbers, the recommended stocking quantity, lead times, and who replies first when the line stops. For buyers ordering from outside China, this is where a project succeeds or stalls, and it is also where the wider capability of a Shenzhen-based maker matters: PowerDe presents itself as covering equipment R&D and manufacturing, system integration, customized configurations, and technical support, and lists engineering services from product development to hardware testing alongside its equipment. Ask which of those services are in scope for your order and who the named contact is.
7. Training and documentation in the language your operators read
Request the operating manual, wiring diagrams, recipe structure, and troubleshooting guide in English if that is what your team works in, plus the changeover procedure for switching substrate width or coating recipe. Ask how long changeover should take and have that timed during the trial.
8. A configuration record you keep after handover
Close the file with a document listing the delivered configuration: model and option set, firmware or control version, installed accessories, the recipes that passed acceptance, and any agreed exceptions. Keep this with the acceptance protocol. When you later compare a quotation for an upgrade or a second line, that record is what lets you compare like with like.
What good answers look like
A supplier comfortable with these requests will send process documents that reference your material, run your coupon on the delivery machine, and put the acceptance protocol into the contract. Evasion on any one of them is the signal, not the wording of the answer. For a first project, request the deliverables in the order above; a vendor who can supply them has already done this work before.
Shenzhen PowerDe Automation Precision Equipment Co., Ltd. presents itself as a manufacturer of automation and process equipment founded in Shenzhen in 2007, with thin-film solar and perovskite equipment among its product areas and engineering services covering customization and technical support. To discuss a coating project, email sales@powerde.net.
