As a manufacturer and supplier of engineered polyurethane products, we specialize in producing custom polyurethane vertebrae bend restrictors ((VBR)) and PU cable protection systems using advanced custom cast processes. Our compound formulation, and production control deliver consistent hardness, superior tear resistance, and dimensional accuracy. Compared with injection-molded or thermoplastic alternatives, our vertebrae bend restrictors are made from high-grade ether-based casting polyurethane which offers better abrasion resistance, improved load distribution, and longer service life in harsh mechanical and marine environments.
These PU vertebrae bend restrictors are widely used across industries requiring reliable cable and hose protection: offshore oil & gas risers and umbilicals, subsea power and communication cables, shipboard and marine moorings, material handling cranes, automated warehouse conveyors, mining haulage lines, heavy machinery power cables, and drilling riser assemblies. Whether for topside cable routing, subsea umbilical protection, or industrial hose bend control, our vertebrae systems are engineered to reduce bend-radius stress, prevent chafing, and extend cable life.
Customization Options:
Parameter
Options / Ranges
Typical Equipment & Application
Segment Inner Diameter
Custom to Ø5mm–Ø500mm
custom cast vertebrae for subsea power cable, clamp-on bend restrictors for umbilical protection
Segment Outer Diameter
Custom per design
large OD vertebrae for heavy-duty crane cable protection, slim profile for conduit routing
Length per Segment
10mm–120mm
short vertebrae for tight bend radius control, long segments for heavy riser applications
soft PU vertebrae for delicate fiber optic cables, hard PU restrictors for industrial power cables
Material Grade
Standard PU / Marine-grade / Oil & Heat resistant
marine-grade polyurethane vertebrae for offshore, heat-resistant PU vertebrae for engine bay routing
Surface Finish
Smooth / Anti-chafe rib / Knurled grip
anti-chafe surface for subsea cable abrasion protection, knurled segments for deck cable retention
Connection Method
Split-clamp, bolted hinge, interlocking collar
clamp-on PU vertebrae for retrofits, interlocking vertebrae for continuous subsea cable runs
Color / Marking
Black / Yellow / Custom bands
high-visibility yellow vertebrae for deck safety, color-coded segments for multi-cable bundling
Load & Temp Rating
Up to 50 kN / -40°C to 120°C
heavy-duty bend restrictors for offshore cranes, temperature-resistant PU vertebrae for engine rooms
Application of Polyurethane Vertebrae Bend Restrictors
- Subsea umbilical and power cable bend protection.
- Offshore riser and tether bending control.
- Shipboard deck cable routing and chafe prevention.
- Crane lift cable and hoist line protection.
- Automated warehouse cable and hose management.
- Mining dragline and conveyor cable protection.
- Drilling riser joint cable assemblies.
- Industrial robot cable bend radius control.
- Port gantry crane cable and hose safety.
- Renewable energy cable routing for wind turbine nacelles.
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Advantages of Polyurethane Vertebrae Bend Restrictors
- Superior abrasion resistance extends service life compared to plastic or rubber protectors.
- Tailored shore hardness provides optimal energy absorption without cracking.
- Excellent resistance to UV, seawater, oils, and hydraulic fluids for harsh environments.
- Cast construction ensures rdimensional stability under load.
- Modular vertebrae design allows precise bend-radius control for varied cable sizes.
- Clamp-on and interlocking options enable fast retrofits and field repairs.
- Lower lifecycle cost through reduced cable failures and maintenance interventions.
- Wide temperature tolerance suitable for topside, subsea, and engine-compartment use.
- Non-conductive PU grades protect electrical insulation and prevent galvanic corrosion.
Success Stories: Custom Polyurethane Vertebrae for Cable Protection Across Industries
- Offshore Umbilical Protection: Delivered custom marine-grade PU vertebrae for an FPSO, reducing umbilical abrasion incidents by 85% over 18 months.
- Port Crane Retrofit: Supplied interlocking PU vertebrae for gantry cranes, eliminating cable chafe and reducing downtime by 60%.
- Subsea Power Cable Project: Provided clamp-on vertebrae for a submarine cable route with simplified installation, cutting installation time by 30%.
- Mining Conveyor Upgrade: Replaced rubber protectors with hard-shore PU vertebrae, extending protector life fourfold under abrasive conditions.
- Automated Warehouse Trial: Custom soft-shore PU vertebrae installed on robotic cable carriers, improving cable flex-life and reducing maintenance calls.
What are vertebrae bend restrictors and why use polyurethane?
Vertebrae bend restrictors are modular segments that control a cable’s minimum bend radius. Polyurethane offers superior abrasion resistance, elasticity, and chemical durability, extending cable lifespan.
Are PU vertebrae UV and oil resistant?
Yes. Marine and industrial PU compound options include UV stabilizers and oil/hydraulic fluid resistance additives.
How long do polyurethane vertebrae last compared to thermoplastic versions?
In abrasive and dynamic environments, cast polyurethane vertebrae typically outperform thermoplastics and rubber by 2–5× in service life.
Do you perform testing and certification?
We provide mechanical test reports (tensile, tear, abrasion), salt-spray, and aging tests; custom certifications available upon request.
How do clamp-on and interlocking designs differ?
Clamp-on designs enable retrofits without removing cables; interlocking collars create continuous, solid protection for new installations and long runs.
Are you a manufacturer?
Yes. We are manufacturer. Welcome to visit our factory.
Can you introduce your customized process ?
Yes. The process includes Share needs → design & quote → prototype (opt) → production → delivery.
How do you control your product quality?
We have 10 inspectors to carry out raw material inspection, process control ,first article inspection and final inspection.
How do you monitor the production process to avoid delayed delivery?
We use the ERP system to execute orders, and can check the order status and expected delivery time at any time.
What is warranty of products?
All of products with 3-6 months guarantee (except very frequently wearing parts).
How do you deal with after sales service?
We will response in 24 hours with solutions such as replacement or reworking.
How do you deal wtih customers' molds?
We have dedicated personnel to sort out and maintain molds regularly.
What about the lifespan of molds?
20,000 times for compressions molds and 30,000 time for casting molds
How long can you keep customers' molds for free?
Due to the large quantity of molds, we can keep the molds for free for 2 to 3 years even if no order.
If the molds are damaged or reach the lifespan , who will be responsible for it ?
Customers only need to pay mold cost once. We will cover the cost if molds are damaged or reach the lifespan.
