An office chair has maybe 25 to 40 parts, and no factory makes all of them. Gas cylinders, casters and some mechanisms come from specialist suppliers — we would be foolish to tool up for a part a dedicated cylinder plant makes by the million. The real question for a buyer is where the line between "we make it" and "we buy it" sits, because that line decides how fast we can move and how much of your order rides on someone else's schedule.
What we keep inside the fence
We pour and cut our own foam, weld our own steel frames, and run injection molding for plastic parts like armrest shells and base components. That is the part of vertical integration that earns its keep. Foam is a good example: a molded seat cushion can be poured to the exact contour of the seat pan, which gives a cleaner edge and consistent firmness without the extra cutting and gluing that slabstock needs. Slabstock — big buns of foam cut to shape — is cheaper and scales easily, so we use it where a simple cut works and reserve molding for contoured seats. Either way, the spec that matters is density in kg/m³, and because we pour it ourselves we control that number rather than discovering it in a cut test.
Welding and injection in-house matter for the same reason: we set the schedule. When the frame shop is ours, a design change or a rush does not mean renegotiating with an outside welder who has three other customers ahead of you.
What we buy, and why that is not a weakness
Cylinders, casters, fabric and many mechanisms we source. The trade-off here is real and worth stating: buying in means you depend on that supplier's lead time and their bad weeks, but it also means those parts come from plants that do nothing else and do it to a stamp you can check. A reputable gas lift carries a TÜV or SGS class mark on the steel; we would rather buy that and show you the mark than make a mediocre one in-house. The risk we manage is single-sourcing — for a large program with a firm date, we keep qualified second sources on the critical bought-in parts so one supplier's fire or shutdown does not stop your container.
Why this shows up on your quote and your calendar
Vertical integration mostly buys you two things: shorter and more predictable lead time, and price stability. When foam, frames and plastics are made on-site, a steel-price wobble or a foam shortage moves our cost, but it does not add the weeks an outside supplier's queue would. For a buyer placing repeat orders, that predictability is often worth more than a slightly lower unit price from a pure assembler who is exposed to every sub-supplier's delays.
Quality control follows the made-in line
Vertical integration changes how we can check quality, not just how fast we move. When the foam is poured in-house, we can pull a sample off our own line and cut it to confirm density before a single seat is upholstered — we are not waiting for an outside supplier's certificate of analysis and hoping it matches the drums that actually arrived. Same with welds: an in-house frame shop lets us spot-check weld penetration and joint geometry on our own schedule, before the frame disappears under foam and fabric where no inspector can reach it. The parts we buy in get checked on receipt instead, which is a different discipline — incoming inspection against a spec and a stamp. Both work; the point is that integration moves the checkpoint earlier, and earlier checks are cheaper to act on.
How injection molding economics reward volume
Injection molding is the clearest example of why we are built for big orders. A mold is a fixed cost — tooling for an armrest or a base can run from a few thousand dollars for a simple cavity to tens of thousands for a complex multi-cavity tool. That cost is then spread across every part the mold produces. The arithmetic is brutal and simple: a tool amortized over 500,000 parts adds cents per unit; the same tool over 5,000 parts adds dollars. So a custom molded part that is uneconomic for a small run becomes cheap at volume, and because we own the presses we can keep a tool in rotation rather than paying an outside molder a setup fee every time. For an ODM buyer wanting their own armrest or base shape, this is where scale turns into a real price advantage rather than a slogan.
The honest counterpoint: a fully integrated plant has high fixed cost, so for tiny one-off orders a small assembler can sometimes undercut us. We are built for volume, and that is the buyer we serve best. We build to BIFMA / EN test methods with third-party testing arranged per order. If you want to see where the made-in line sits on a specific model, our OEM / ODM page walks through it, the product range shows what comes off these lines, and the export desk will map the bill of materials for your spec.