When you source sliding windows from a Chinese manufacturer for a villa or a whole-house project, the product you approve at the factory is not the product that arrives at your site. Between the two sits an ocean of handling, humidity, and vibration. Custom packaging is the bridge that decides whether your order lands intact or becomes a claims file. This guide explains what "custom packaging" actually means for sliding windows shipped from China, and how a system supplier like ALPES builds it around each unit.
A sliding window is a sandwich of three fragile things: a powder-coated aluminum frame, a sealed insulated glass unit, and precision hardware. On a 30- to 45-day sea voyage from Guangdong to the Middle East or Australia, that sandwich is stacked, lifted, rained on, and shaken. Weak packaging saves a few dollars at the factory and can cost a whole crate at the port. For ALPES, which runs a 100,000 m2 production base in Foshan and Zhaoqing and ships villa projects to Saudi Arabia, Dubai, and Australia, packaging is treated as part of the product, not wrapping put on at the end.
Custom does not mean decorative. It means the crate is built to the unit, not pulled off a shelf. Three variables drive the design: the profile thickness of the frame, the area and weight of the glass, and the destination climate. A slender 1.8 mm outward window and a 2.5 mm heavy-duty sliding door are packed differently because they fail differently. The same logic applies whether you order a sliding window or an alum sliding door from the same line.
A defensible export pack for aluminum sliding products stacks six layers. Each exists because a specific failure mode is common without it.
A metal sliding door and an aluminum sliding window share the same vulnerability: the moving sash is the heaviest, most fragile part. Sliding sashes carry real mass, so they are locked shut and held with temporary transport screws before the crate is closed. The glass, which can be a large insulated unit, gets EPE foam and impact guards, and a spare glass unit is packed in a separately marked crate. For a large opening such as a 72 x 60 sliding window (1829 mm x 1524 mm), the crate is dimensioned to that exact unit rather than a generic box, because the gap between glass and crate wall is where breakage happens.
Packaging follows the structural spec of the product. The table below maps common ALPES sliding families to the protection logic they imply. All use 6060-T66 aluminum with 1.8 to 2.5 mm walls and PA66GF25 multi-chamber thermal break, finished in Ice Cream White, Aurora Gray, Starry Sky Gray, Brown Coffee, or a custom match.
| Model | Key build | Packaging focus |
|---|---|---|
| TS130 side-press sliding window | 6060-T66 1.8 to 2.0 mm, 130 mm frame, ROTO side-pressure hardware, 200 kg pulleys, eight-point lock | Lock sash, protect eight-point lock, four-sided seal faces guarded |
| SL155 thermal-break sliding door | 6060-T66 2.2 to 2.5 mm, four-track 155 mm, 400 kg 20-wheel, single sash up to 2800 x 2600 mm | Crate to the 2.8 m panel, brace the 400 kg sash, eight-layer seal protected |
| SL112 / SL167 heavy-duty sliding door | 6060-T66 1.8 to 2.5 mm, 112 / 167 mm frame, 220 kg sash, 24A insulated glass | 45 mm high-ｄｒｏｐ bottom track guarded, 24A glass cushion-wrapped |
| SL126 / SL182 thermal-break sliding door | 6060-T66 2.0 mm, 126 / 182 mm frame, sash up to 2500 x 3000 mm, 27A glass, 8 mm low track | 27A glass braced, low-track edge shielded, 3.0 mm local reinforcement noted |
Crates are loaded vertically, the way the units are installed, with the heaviest at the bottom and voids filled with dunnage or airbags so nothing shifts on a rolling sea. A unique container seal number is recorded on the bill of lading for tamper evidence, and loading photos are taken before the door is closed. For whole-villa orders, a full container load (FCL) is safer than less-than-container load (LCL) because your goods are not opened and re-stacked at a consolidation warehouse.
Custom packaging includes the paper that travels with it. Each crate carries the order number and crate number, a packing list, and handling marks. The factory supplies the commercial invoice, packing list, bill of lading, certificate of origin, and the IPPC mark on the wood. Customs clearance itself, including duty classification under HS 7610 and local taxes, is handled by your broker at the destination, not by the factory. Ask for these documents in English before the container sails.
A complete shipment includes more than the fabricated units. Spare glass of each type, spare handles, hinges, rollers, and lock cylinders (commonly 2 to 5 percent of the hardware count), colour-matched touch-up pens, fixing screws, perimeter sealant, and setting blocks are packed so the installer is not blocked by a single broken part. This is where factory-direct supply pays back: a single sash can be replicated from the original order rather than replacing the whole opening.
Do not leave packaging as "export standard" in your order. Specify it. The table below turns vague promises into checkable clauses.
| Ask for | Good answer | Red flag |
|---|---|---|
| Wood crate standard | IPPC / ISPM 15 marked, fumigation-free | Unmarked raw timber, no IPPC stamp |
| Sash restraint | Locked shut, transport screws, marked for removal | "We just wrap it", no fixing |
| Glass protection | EPE foam, impact guards, spare unit included | Glass loose in crate, no spare |
| Moisture defence | Waterproof wrap plus desiccant for sea climate | Cardboard only, no moisture barrier |
| Traceability | Per-crate number, packing list, loading photos | Unmarked boxes, no list |
| Spares | Spare glass and 2 to 5 percent hardware | No spares offered at all |
Custom packaging for sliding windows from China is not a luxury line item; it is the last stage of manufacturing. When the crate is built to the unit, the hardware is separated, the glass is braced, and the documents travel with the box, your villa order arrives the way it left the factory. ALPES builds this discipline into every FCL shipment from its Guangdong base, and it is worth insisting on the same standard from any supplier you compare. Ask for the packing specification in writing before you sign.
