China sliding window combined shipment

What a combined shipment actually means for sliding windows

When a buyer in the Middle East, Australia, or Europe talks about a China sliding window combined shipment, the phrase usually hides two different deals. The first is combining several product lines from one factory, say sliding windows plus sliding doors plus a sunroom, into a single container under one set of documents. The second is less-than-container-load consolidation, where your cartons share a container with cargo from other importers because your order is too small to fill a box on its own. Both reduce cost, but they change your paperwork, your timing, and your risk in different ways. A china top sliding storm windows factory can support either model, but the questions you ask the factory and the forwarder are not the same.

Two deals that share the same name

The container math to do before you book

Sea freight for consolidated cargo is normally charged on a weight-or-measurement basis: you pay for the cubic meters you occupy, unless your goods are heavy enough that the weight figure wins. A standard 20-foot container is commonly cited at about 28 to 33 cubic meters of usable volume; a 40-foot high cube about 65 to 68 cubic meters. For glazed aluminum windows the limiting factor is often weight, not volume, because glass is dense.

As a planning estimate only, using the common rule of about 2.5 kg per square meter per millimeter of glass thickness: a 1.5 m by 2.5 m sliding sash glazed with 6 mm plus 24A plus 6 mm insulated glass has roughly 3.75 square meters of glass area and about 12 mm of total glass thickness, giving a glass mass near 112 kg before the aluminum frame and hardware are added. Confirm the real figure with your factory, because the aluminum section, the insulating glass build-up, and the hardware change the number. The point is that a few large glazed sashes can hit the chargeable weight ceiling while the container is still half empty.

Why sliding windows are a special case for consolidation

• Long rigid cartons. Sash heights can reach about 2.5 to 3.0 m, so cartons are awkward to mix with small boxes and must be loaded along the container length, not stacked across it.
• Glass weight dominates the chargeable figure, so a partly full container can still be charged by weight.
• Mixed orders combine naturally. A buyer who sources sliding windows, sliding doors, and a sunroom from one manufacturer is already holding several lines that belong in one container.
• Fragile edges. Glass corners and profile faces need edge protectors and separation from abrasive or heavy cargo in a shared box.

How a combined shipment moves, step by step

1. Factory delivers cartons to the forwarder container freight station, or the forwarder collects from the factory gate.
2. Cargo is received, measured, and held in the consolidation warehouse until the cut-off.
3. For supplier-side combine, all your lines are packed together; for LCL, your cartons are loaded beside unrelated cargo.
4. Export clearance is filed in China against the packing list and commercial invoice.
5. The consolidated container sails on the forwarder schedule.
6. At destination the box is deconsolidated, each consignment cleared, and delivered.

Choosing supplier-side combine versus shared LCL

If you already buy from a china mesh sliding window supplier who also builds sliding doors and sunrooms, the supplier-side combine is usually the cleaner path because one factory controls the carton sizes and the load plan. If your order is a few cartons only, shared LCL is the realistic option.

Packing sliding windows for a shared container

• Corner guards on every profile end and a full perimeter of EPE foam inside the carton.
• Glass faces labeled fragile, this-way-up, and kept clear of cartons that could press on the edge.
• Hardware and small fittings in a separate carton so they are not lost inside a long sash box.
• No chemical, food, or wet cargo beside the glass; incompatible goods are a real claim risk.

Documents and customs honesty

A combined shipment still needs an accurate packing list and commercial invoice, with aluminum windows and doors usually declared under the HS heading for aluminum frames and doors. ｄｅｃｌａｒｅ glass and hardware on their own lines when your destination requires it, and never understate values to save duty, because that moves the risk onto you at the border. If you work with an aluminum sliding window supplier who ships through your nominated forwarder, ask the factory for the carton dimensions, gross weight, and CBM per line so your broker can file clean entries.

What to put in your booking request

When not to combine

• A hard deadline, because consolidation and deconsolidation add days you cannot compress.
• Fragile glass mixed with rough or wet cargo you cannot separate.
• One line is hazardous and cannot legally sit in a general container.
• You already have enough volume for a full container, where the per-unit cost is usually lower.

Where a manufacturer like ALPES fits

ALPES is a system window and door manufacturer with production centers in Foshan and Zhaoqing, Guangdong, exporting to the Middle East, Australia, and Europe. A combined shipment works best when you order sliding windows, sliding doors, and a sunroom from one factory and load them together. Be clear on the division of labor: the factory builds, packs, and delivers cartons to your nominated forwarder's warehouse; the factory does not issue the bill of lading or act as your customs broker. Ask the factory for per-line carton data and a packing list, then let your forwarder do the consolidation and the paperwork. The combination decision is yours; the factory supplies the goods that make it worthwhile.

Frequently asked questions

Is combined shipment cheaper than a full container?

Usually for small volume, because you pay only for the space you use. Once your cargo approaches a full box, the per-unit cost of a full container tends to win, so ask for both quotes.

Why might I be charged by weight instead of volume?

Glazed sashes are heavy. If the weight figure exceeds the volume figure under the carrier weight-or-measurement rule, the heavier number sets the freight.

Can I mix windows and doors from one factory in one shipment?

Yes, and that is the supplier-side combine. One factory controlling carton sizes makes the load plan cleaner than mixing random cartons.

Is my glass safe in a shared container?

It is safer with proper corner guards, edge foam, and separation from abrasive cargo, but shared containers are handled more often than a dedicated box, so packing quality matters more.

Who files the export customs in China?

Your forwarder or the consolidator, using the invoice and packing list you provide. The factory supplies the carton data; the forwarder files the entry.

Does ALPES arrange the ocean freight?

No. ALPES manufactures and packs, then delivers to your forwarder. You or your forwarder books the vessel and handles customs at both ends.

Short version

• Combined shipment means either one supplier's lines in one box, or your cartons sharing a box with others.
• For glazed sliding windows, weight often sets the freight, not volume.
• One factory covering windows plus doors plus sunroom is the cleanest combine.
• Get per-line carton dims, weight, and CBM from the factory before you book.
• Do not combine when you are urgent, hazardous, or already full-container volume.