No rust, no periodic repainting, and impacts that deform locally instead of breaching the hull. One material choice that answers both questions at once: how long the aid survives on station, and how often somebody has to go out to it.
Most of what a steel hull costs over its life is not the purchase order — it is every subsequent descaling, repaint, replacement and recovery. In salt spray, silty water or heavy-fouling conditions the protection cycle shortens, and sending a maintenance vessel out costs far more than the hull itself.
Ultra-high-molecular-weight polyethylene sidesteps that cycle at the material level: the hull does not corrode, colour is carried in the polymer rather than applied to the surface, and the molecular structure keeps the material tough at low temperature — a strike usually leaves a dent that partly recovers, not a hole that floods.
The result is longer intervals between visits and less work at each visit. For scattered stations with limited maintenance windows, that difference outweighs unit price.
No electrochemical corrosion, so no sacrificial anodes and no repainting cycle — in seawater, brackish transitions or water carrying industrial discharge alike. What is saved is the slipping and labour at every protection interval.
Low surface energy and a low friction coefficient make it harder for barnacles and algae to attach, and easier to remove what does. That directly protects freeboard and focal height.
High impact toughness retained at low temperature. Contact from a passing vessel or floating debris typically leaves a local dent that partly recovers, rather than a split plate that floods and sinks the hull.
Pigment is compounded into the material with UV stabiliser, so a scratch exposes the same colour rather than primer. It avoids the familiar situation of an aid that is still on station but no longer readable.
Lower mass than an equivalent steel hull, so lifting and transport need lighter equipment. Hull, topmark, lantern frame and ballast are separate modules, replaceable individually in the field.
Local damage can be heat-welded on site instead of returning the hull for coating, and end-of-life material can be recycled — increasingly a requirement in project specifications.
Standard channel buoys covering lateral, cardinal, isolated danger, safe water and special marks. Hull diameter and ballast are graded by depth and current.
A streamlined hull takes less load and heels less in strong current — suited to inland and canal reaches with high flow or large water-level variation, reducing dragging and lay-over.
For banks, shoals, embankments and bridge piers where a fixed structure can be founded. A non-metallic structure removes the descale-and-repaint visit every few years.
Spherical, conical, cylindrical and X-shaped topmarks plus dayboards and lantern frames. A common interface standard fits our own hulls and can also retrofit existing steel buoys.
Ballast blocks, mooring chain connectors, fender strips, inspection ladders and solar panel brackets. Hulls and fittings can be made to drawing where a project requires it.
The table below lists what has to be fixed during selection. Fields marked ⌛ must be completed from the company's actual range data — we do not publish unverified figures.
| Hull material | Ultra-high-molecular-weight polyethylene, pigment compounded through the wall, UV stabilised |
|---|---|
| Buoyancy filling | Closed-cell foam fill, retaining buoyancy after hull damage (fill material and density to be confirmed) |
| Hull sizes | To be completed: diameter / height / freeboard / displacement per size |
| Water depth range | To be completed: recommended depth range per size |
| Current limit | To be completed: recommended maximum current per size |
| Shapes and colours | Lateral, cardinal, isolated danger, safe water and special marks per the IALA Maritime Buoyage System |
| Topmarks | Spherical / conical / cylindrical / X-shaped, standard interface, individually replaceable |
| Lantern | Fits our own marine lanterns, or a mounting interface prepared for a project-specified model |
| Telemetry | Optional telemetry terminal reporting light character, battery voltage, position and off-station alarm |
| Mooring | Chain, sinker and connectors sized against depth, current and seabed (calculation basis to be confirmed) |
| Design life | To be completed: from type test reports and in-service data |
| Standards | To be completed: the standards the company actually manufactures and tests to |
⚠ Every ⌛ field is technical data that must come from the company. Until there are type test reports or a published range sheet behind them, these numbers must not appear on a public page — in tendering and contract performance, a wrong figure is a real liability.
Give us channel class, depth, current and the number of hulls required. You will get a configuration recommendation, model list and price — not a generic brochure.