Rubber Fender

Heavy-Duty Marine Rubber Fenders: Engineering, Selection & Technical Specifications

Marine rubber fenders absorb kinetic energy during vessel berthing and mooring, protecting quay walls, jetties, and vessel hulls from structural impact damage. Designed for high-frequency berthing operations in commercial ports, offshore platforms, and shipyards, these fenders balance energy absorption (E) and reaction force (R) to maintain structural safety under variable wave and tidal forces.

Core Function

Converts kinetic energy into elastomer deflection, capping the load transferred to dock piles and hull plating.

Service Environments

Container ports, LNG terminals, bulk cargo piers, tugboat bows, and ship-to-ship (STS) transfer stations.

Engineering Support

Downloadable PDF Technical Data Sheets (TDS) and 2D/3D CAD models available for all standard configurations.

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Fender Types & Technical Configurations

Different berthing geometries require specific fender cross-sections. Below are the standard industrial configurations:

Fender Type	Cross-Section / Profile	Key Characteristics	Typical Applications
Cell Fender (SC)	Cylindrical body with integrated steel mounting frames	High energy absorption per weight ratio; stable performance under angular berthing up to 10°.	High-tonnage container terminals and bulk berths.
Cone Fender (SCN)	Conical shape with top frontal frame & UHMW-PE pads	Geometry maintains energy absorption even at large berthing angles (up to 15°); minimal shear force impact.	Modern mega-vessel terminals and high-tidal range docks.
Arch Fender (DA / SA)	One-piece arch profile with embedded steel mounting plates	Simple installation; tough cross-section withstands severe shear stresses without a frontal frame.	General cargo berths, workboat jetties, and quay walls.
Cylindrical Fender	Hollow cylinder, suspended by chains or central bars	Low reaction force at initial deflection; straightforward maintenance and installation.	Tugboats, barges, and traditional pier structures.
D-Type & Square	D-shaped or solid square profile with through-holes	Direct bolting to steel or concrete structures; versatile, compact footprint.	Small craft berths, tugboat hulls, and inner quay walls.
Element / Leg Fender	Modular leg units with outer face pads	Flexible arrangement; can be assembled into custom lengths and multi-leg buffers.	Ro-Ro terminals and restricted space structures.

Technical Specifications & Material Performance

All fenders are manufactured using high-grade synthetic/natural rubber blends (NR/SBR) reinforced with cross-linked sulfur vulcanization systems.
Rubber Compound Physical Properties (ASTM Tested)

Tensile Strength	≥ 16 MPa (ASTM D412)
Elongation at Break	≥ 350% (ASTM D412)
Hardness	65 ± 5 Shore A (ASTM D2240)
Ozone Resistance	50 pphm × 40°C × 96 hrs (No cracks, ASTM D1149)
Compression Set	≤ 25% (70°C × 24 hrs, ASTM D395 Method B)

Typical Performance Standard (Selection Matrix)

Values measured at standard temperature (20°C) and rated deflection rate according to PIANC guidelines.

Type & Size Code	Height / Outer Dia. (mm)	Deflection Rate (%)	Energy Absorption (E, kN·m)	Reaction Force (R, kN)	Weight Range (kg/m or unit)
Cell SC 500H	500	52.5%	38–48	180–225	~175
Cell SC 1000H	1000	52.5%	305–385	730–910	~1,420
Cone SCN 800H	800	72.5%	185–235	410–520	~850
Arch SAN 400H	400	50.0%	28–35	195–245	~110
Cylindrical 500OD	500 (250 ID)	50.0%	20–26	130–165	~145

Berthing Energy Calculation & Application Guide

Selecting the correct fender profile requires calculating the vessel’s effective kinetic energy (Ek) upon impact:
Ek = 1/2 × Cm × Ce × Cs × Cc × M × v²
Where:
M = Displacement Tonnage of the design vessel
v = Berthing velocity perpendicular to the quay
Cm = Hydrodynamic mass coefficient
Ce = Eccentricity coefficient
Cs = Softness coefficient
Cc = Berth configuration coefficient

Site-Specific Match Matrix
• Container Terminals (≥ 100,000 DWT): Cone or Cell Fenders with UHMW-PE frontal panels to minimize hull friction (μ ≤ 0.2).
• Tugboat Bows & Sterns: Cylindrical or W-Type fenders vulcanized for high abrasion and push-pull shear forces.
• Piers with High Tidal Variations: Parallel Cone or Leg Systems mounted on long vertical frame tracks.

Manufacturing, Hardware & Quality Verification

Manufacturing Facilities & Capabilities

In-House Vulcanization: Hydraulic compression molding presses up to 3.0 m × 8.0 m (2,000-ton clamp force) for seamless fender curing.

Internal Compounding: Internal Banbury mixers with automated carbon black dosing ensure consistent batch density and elastomer distribution.

Mounting Hardware: Embedded steel plates are hot-dip galvanized (HDG per ISO 1461) or supplied in 316 Stainless Steel with U-bolts, shear pins, and tension chains.

Quality Control & Third-Party Testing Verification

Every production lot undergoes rigorous inspection in accordance with PIANC 2002 guidelines.

Full-Scale Compression Testing (CV Test): Real-time load-deflection verification on a 1,500-ton digital hydraulic testing rig to map exact E/R curves.

Rheometer Batch Testing: Verifies vulcanization curves and Mooney viscosity for every rubber compound batch.

Material Verification: Tensile, tear, thermal aging, and seawater immersion tests performed in accredited ISO/IEC 17025 laboratories.

Third-Party Inspection Certificates: Formal Type Approval Certificates (TAC) and Factory Acceptance Test (FAT) reports issued by DNV, Bureau Veritas (BV), ABS, or Lloyd’s Register (LR) upon request.

Frequently Asked Questions

Q: What rubber grades are used in your fender manufacturing?

A: We formulate fenders using virgin Natural Rubber (NR) combined with Styrene-Butadiene Rubber (SBR). We do not use recycled rubber powder or reclaimed rubber fillers, ensuring low compression set and extended fatigue life in saltwater environments.

Q: How do you verify performance curves for custom fender sizes?

A: Full-scale compression testing is performed on our hydraulic press rigs. The energy-reaction curves are logged digitally and matched against PIANC 2002 tolerance limits (± 10%). Type Approval Certificates (TAC) and factory acceptance tests (FAT) are provided prior to shipment.

Q: Are mounting accessories and fixing hardware included in the supply scope?

A: Yes. We supply complete marine hardware packages, including anchor bolts, embedded plates, UHMW-PE face pads, frontal steel frames, and restraint chain systems (tension, weight, and shear chains).

Q: What is the estimated service life of your rubber fenders under tropical or Arctic marine conditions?

A: With correct sizing and UV/Ozone-resistant compounding, operational service life ranges between 15 to 20 years. Compound additives are adjusted based on site temperature specs (e.g., -40°C low-temperature resistance for Arctic ports or elevated anti-oxidants for high UV equatorial locations).

Q: Can you supply fenders matching existing bolt hole footprints for port retrofits?

A: Yes. We produce customized mounting hole pattern profiles and custom arch or cell dimensions to match existing concrete embedded anchors, eliminating the need for drilling or re-coring existing quay walls.

Q: What documentation and certificates accompany a shipment?

A: Standard shipment documentation includes:
Raw Material Mill Certificates & Batch Test Reports
Factory Acceptance Test (FAT) Report (E/R performance curve)
Coating & Galvanizing Inspection Reports for frames and hardware
Third-Party Inspection Certificates (BV, DNV, ABS) if specified in the PO.

Request a Technical Quote (RFQ)

Need fender sizing calculations, CAD drawings, or a commercial quote for your project? Submit your project parameters below to receive a response within 24 hours.
Required Project Details for Fast Quoting
Vessel Type & Maximum Displacement (DWT)
Dock Type (Solid Quay wall, Dolphins, Jetty)
Maximum Allowable Hull Pressure (kN/m²)
Fender Type / Dimensions (or reference drawings)
Required Third-Party Certification (DNV / BV / ABS)
Contact Engineering Sales
Email: yzheli@188.com
Direct Line: +8613951059886
Technical Support: CAD/3D drawings, PIANC calculations, and custom bolt-pattern engineering are available upon request.

As one of the most experienced rubber fender manufacturers and suppliers in China, we offer a wide range of products with superior quality. Please feel free to buy advanced rubber fender for sale here from our factory. Customized orders are welcome.