Almost every supplier profile in this industry says the same thing: experienced in export. The phrase is easy to print and hard to check, which is exactly why it fails buyers. A container of aluminium windows that arrives late, fails a local inspection, or cannot be serviced five years later is not a product problem alone. It is a supplier capability problem that started months earlier, at the moment nobody asked for proof.
The practical way to handle this is to stop treating export experience as an adjective and start treating it as a list of verifiable requirements. Each requirement below has three parts: what to ask, what a genuine answer looks like, and what a red flag looks like. That structure works whether you are buying a single villa package or a multi-building development.
The first distinction to settle is factory versus trading intermediary. Neither is illegal, but they carry different risks, and the difference shows up in documents long before it shows up in the product.
Certificates are necessary and insufficient. What matters is whether the supplier understands which standard governs your project and can produce a test report whose scope actually covers the series you are buying.
Equally important is drawing capability. Before mass production you should receive shop drawings showing sections, drainage paths, anchoring details, and interface with the building structure, signed and dated. A factory without in-house engineering will send you a catalogue page and call it a drawing.
Experienced exporters are comfortable being specific. They state alloy temper, wall thickness, thermal break material, hardware brand, and test results, because those are the numbers their production is built around. Below is the kind of table a buyer should be able to fill in from a supplier's technical sheet, using ALPES published figures as the worked example.
| Specification | What to request | ALPES published value |
|---|---|---|
| Aluminium alloy and temper | Mill certificate with grade stated | 6060-T66 |
| Profile wall thickness | Measured value on delivered sections | 1.8 to 2.5 mm by series; locally reinforced to 3.0 mm on SL126 |
| Thermal break | Material grade and strip width | PA66GF25, multi-chamber, 34 to 44 mm strips on C116 |
| Thermal transmittance | Whole-window K value, not centre-of-glass | K 1.3 on AW90, 1.6 on C120, 1.7 on C116 |
| Hardware system | Brand named in contract, cycle test record | ROTO, Winkhaus, Wehag, CMECH; CMECH tested to 30,000 cycles |
| Corrosion and strength | Test report number and duration | 240-hour salt spray, 5,000 N shear resistance on AW90 |
If a quotation will not commit to these six lines in writing, the price is not comparable to one that does. That is the single most useful thing a buyer can learn about this category.
Export experience shows up most clearly in how a factory handles the awkward parts of a project: very large openings, coastal exposure, and local preferences for how a window should open.
This is also where a custom casement window order gets decided: frame width, mullion width, glass sash thickness, mesh type, and handle position all have to be reconciled against the opening schedule before tooling starts, not after.
Aluminium windows are bulky, heavy, and vulnerable at the corners and the finish. Most disputes in this category are not about performance; they are about what the crate looked like when it was opened.
Among china sliding door manufacturers, the ones with genuine export history will also warn you about panel height limits, glass weight per crate, and whether your destination port handles over-height containers.
Production scale matters once your order is two containers rather than two crates. ALPES runs a 100,000 square metre operation across two production centres in Foshan and Zhaoqing, which is a meaningful signal for buyers whose projects cannot absorb a missed shipping window.
The more revealing question, though, is what the factory says no to. Ask for the monthly output available to your series, the standard lead time after deposit, the step that normally becomes the bottleneck, and what happens if you add a second container mid-production. A supplier that names its constraints is easier to plan around than one that agrees to everything.
Windows are mechanical assemblies. Hinges, handles, and rollers wear, and seals age. The export-ready supplier plans for that instead of treating delivery as the end of the relationship.
It is worth being blunt about this, because buyers who discover it late tend to blame the factory for things no factory controls. Local code approval is usually obtained by a local engineer or laboratory in your country, using the manufacturer's documentation as input rather than as a substitute. Installation is almost always performed by a local crew, so workmanship defects are rarely the exporter's. Time differences slow down any issue that genuinely needs a live conversation. And small sample shipments cost disproportionately more per square metre than container orders, which discourages proper testing if you plan badly.
None of these are arguments against sourcing from China. They are arguments for budgeting time and local expertise alongside the product cost, which is what an experienced exporter will tell you in the first meeting.
| Check | Pass condition |
|---|---|
| Manufacturing licence | Factory address and production scope in the registered business scope |
| Export record | Customs declarations or bills of lading shipped under the factory name |
| Market standards | Test report to your destination standard, scope covering your exact series |
| Shop drawings | Signed sectional drawings with anchoring and drainage detail |
| Material traceability | Alloy temper, wall thickness, and thermal break grade written into the contract |
| Hardware commitment | Brand and model named, with cycle test reference |
| Oversize engineering | Pulley rating and reinforcement stated for your largest panel |
| Packing method | Photos of the real packing line plus a loading plan before booking |
| Capacity and lead time | Monthly output for your series and the named bottleneck step |
| Third-party inspection | Pre-shipment inspection welcomed, not negotiated away |
| Spare parts | Parts kit with SKUs shipped with the main order |
| Claim procedure | Written warranty with response time and required evidence |
ALPES is a system window and door manufacturer with a 100,000 square metre production base split between Foshan and Zhaoqing in Guangdong, exporting to multiple countries and showing completed villa and residential projects in Saudi Arabia, Dubai, the wider Middle East, and Australia. The product range covers thermal break casement windows, sliding windows, tilt and turn windows, and heavy-duty sliding doors, built on 6060-T66 profiles with PA66GF25 thermal breaks and ROTO, Winkhaus, Wehag, and CMECH hardware.
If you are comparing suppliers, the fastest route is to send the scorecard above and see who answers it without hesitation. The exercise costs one email and tells you more than a week of browsing catalogues.
Years alone are a weak filter. Prioritise shipments to your own region, because that is where the supplier has already solved your standards, packing, and documentation problems. A factory with a shorter history but three completed projects in your market is often the safer choice.
Yes, and you should. Ask for a full-size section sample rather than a small corner cut, so you can judge corner joints, gasket compression, hardware feel, and finish consistency. For large projects, send a sample unit to an independent laboratory for thermal and water testing before mass production.
Many can provide test reports and declarations, but you must confirm the report scope covers your exact series, glass build-up, and hardware. A generic certificate covering a different profile family does not support your compliance file.
Responsibility depends on the agreed Incoterm and your marine insurance, which is why packing quality and the loading plan matter so much. Photograph crates before unloading and file claims immediately with supporting images.
Confirm the maximum single sash size, the roller load rating, and the corrosion protection for a marine environment before you finalise the elevation. ALPES SL155 handles a single sash up to 2800 by 2600 mm on a 400 kg pulley system, and SL126 reaches about 2.5 by 3.0 m with local reinforcement to 3.0 mm.
If the order justifies the trip, yes. If not, a live video walkthrough during working hours, combined with a third-party pre-shipment inspection and a tested sample, covers most of the same ground at a fraction of the cost.
