Products and Services Polyurethane Product SeriesBend limiter

Bend limiter

Polyurethane bend restrictor with modular interlocking structure locks the safe bending radius of submarine cables, suitable for offshore wind power and subsea pipeline protection. The split‑clamp bend‑limiting device resists seawater corrosion, prevents damage caused by excessive cable bending, and enables rapid on‑site assembly.

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Core Advantages

Highly‑adaptable Structural Design

Hafu‑style split‑open structure, high‑performance polyurethane; precise and reliable bend‑limiting protection, highly adaptable modular design

Highly‑adaptable Structural Design
Certification of Superelastic Materials

Super‑elastic MDI polyurethane system (adjustable stiffness, multi‑environment resistance). Material tests comply with API standard tests and meet certifications from BV, DNV or classification societies.

Certification of Superelastic Materials
Excellent weather resistance

Excellent weather resistance in extreme environments, lightweight and high‑load‑bearing performance, integrated multi‑functional protection

Excellent weather resistance

Performance indicators

Performance indicators

Test	Test program
wear resistance	ISO 7784-2ᵇ，ASTM D4060ᵇ，BS903-A9，DIN 53516
Compression property	ISO 604ᶜ、ASTM D695ᶜ、ISO7743
Densityᴰ	ASTM D792，ISO 1183
hardness	ISO 868ᶜ, ASTM D2240, BS 2782 Part 3, Method 365Bᶜ
Heat Deflection Temperature	ISO 75-1、ISO 75-2、ASTM D648ᶜ
Impact toughness	ISO 179-1、ISO 179-2、ISO 180ᶜ、ASTM D256
shear performance	ISO 1827，ASTM D732
Stretchability	ISO 527-1ᶜ、ISO 527-2ᶜ、ASTM D638C 、ISO 37
crawl	ASTM D2990，ISO 899-1

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Key Technical Parameters

Key Technical Parameters

Parameter item	Conventional reference indicators	Customizable Scope
Adapt to the outer diameter of the pipe‑cable	50mm~500mm	Customizable for the full range of cable and pipeline specifications
Lock the bending radius	≥20 times the outer diameter of the pipe‑cable	Customization for the minimum safe bending radius of matching pipe‑cables
design life	25 year	10~30 year
Applicable working water depth	0~1000m	Customizable ultra‑deep‑water compatible model
Main material	High‑performance Polyurethane (PU)	Customizable reinforced polyurethane, special weather‑resistant materials
Fastener material	Stainless Steel 2507	stainless steel, titanium alloy, etc.
Operating temperature	-30℃~80℃	Customizable models resistant to extreme high and low temperatures

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Application Areas

Offshore wind power sector (core application scenario)

Standard protective parts for domestic offshore‑wind submarine cable systems: J‑tube/I‑tube nozzle, offshore substation cable interfaces, floating wind dynamic‑cable‑platform joints, and submarine‑cable shore‑landing transition sections.
Offshore oil and gas development sector

Protection for flexible‑riser‑to‑rigid‑structure joints, subsea umbilical terminations and oil‑transfer hose interfaces, suited for deep‑sea oil‑gas conditions of high pressure, corrosion and dynamic loads.

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