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subsea umbilical, ROV tether & oceanographic tow cable Seal 428 / 300–570 kN Lead-In500 V DC (-30 to +80 °C)300–570 kN Multi-Layer Steel Wire Ar

Seal 428 500 V DC 300–570 kN Heavy Multi-Layer Steel-Armoured 3D Seismic Streamer Lead-In CableSeal 428 / 300–570 kN Lead-In — 500 V DC — -30 to +80 °C Subsea & Offshore Cable

Seal 428 500 V DC 300–570 kN Heavy Multi-Layer Steel-Armoured 3D Seismic Streamer Lead-In Cable (Seal 428 / 300–570 kN Lead-In) engineered for 500 V DC service across -30 to +80 °C (min. bend radius 15 × OD).

Water-resistant

EMC screen

Oil-resistant

Approved

Configuration

Order designation: Seal 428 Lead-In 4–12F EOM/Sub
Outer Ø ≈: 8.2 mm
Net weight ≈: 260 kg/km
Tensile rating ≈: 48.0 kN
Core / stranding: Laser-welded SS FIMT + Steel/Aramid Armour

All sizes (3)

Request a quote Datasheet WhatsApp info@tebaoflex.com

Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum

Rated voltage: 500 V DC
Operating temp.: −30…+80 °C
Min. bend radius: 15 × OD
Core / conductor: High-Speed Singl
Outer protection: 300–570 kN Multi
Standard: Seal 428 / 300–5

Typical values for this cable type, based on Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification — confirmed in the datasheet and quotation for your order.

Application fit

Is Seal 428 Lead-In right for your machine?

Immersion & wet locations

Suitable

Hydrolysis-resistant polyurethane (PUR) or HDPE jacket and water-blocked core withstand continuous deepwater hydrostatic immersion.

Vertical / spreader reel

Suitable

Torque-balanced contra-helical steel wire armour or high-modulus aramid strength member supports dynamic winch deployment without hockling

Trailing & towing

Suitable

Abrasion-resistant outer sheath and high working-load strength elements handle dynamic marine towing, buoy mooring and ROV excursion.

Offshore platform & shipboard deck trays

Suitable

UV-stabilised, oil- and seawater-resistant construction withstands A-frame sheaves, traction winches and open research-vessel decks.

Energy chain / drag chain

Not suitable

Subsea umbilical, ROV tether and towed array cables are not designed for indoor factory automation drag chains.

Use M23 Servo Assembly

Typical machinesUnderwater & Ocean ExplorationOceanographic CTD, ADCP & Deep-Tow SurveysWork-Class & Observation ROV / AUV SystemsSide-Scan Sonar, SAS & Towed Hydrophone ArraysMarine 2D/3D/UHR Seismic Streamers & OBC

Construction

Layer by layer

Shown: Seal 428 Lead-In (Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification) featuring high-speed single-mode optical unit, large-section copper power buses (6 cores) and 300–570 kn multi-layer steel wire armour (4-layer construction).

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	High-Speed Single-Mode Optical Unit	Central stainless-steel tube housing single-mode telemetry fibers
2	Large-Section Copper Power Buses (6 Core	Stranded copper conductors with XLPE/PE insulation feeding streamer array
3	Extruded Polymeric Inner Bedding	Void-free high-pressure polyethylene inner jacket
4	300–570 kN Multi-Layer Steel Wire Armour	Contra-helical preformed heavy galvanized steel wire armour (1,500 m)

Seal 428 Lead-In — Standard Subsea & Offshore Execution

Built to Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification with high-speed single-mode optical unit and 300–570 kn multi-layer steel wire armour

Seal 428 Lead-In — Custom Continuous Winch / Reel Length

Available in custom continuous subsea winch, tow or seabed lengths with water-blocked terminations

Seal 428 Lead-In — Hydrostatic, Tensile & Routine Certified

Supplied with EN 10204 3.1 routine dielectric, optical OTDR / DC resistance & tensile test report

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage / transmission duty: 500 V DC (Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification)
Core / conductor construction: High-Speed Single-Mode Optical Unit — Central stainless-steel tube housing single-mode telemetry fibers
Primary dielectric / buffering: Large-Section Copper Power Buses (6 Cores) — Stranded copper conductors with XLPE/PE insulation feeding streamer array

Thermal

Continuous operating temperature: −30…+80 °C (subsea & offshore duty)
Hydrostatic & thermal stability: Verified thermal and hydrostatic stability per Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification
Storage & transport temperature: −40…+80 °C on export wooden/steel winch reel

Mechanical

Outer protection / armouring: 300–570 kN Multi-Layer Steel Wire Armour — Contra-helical preformed heavy galvanized steel wire armour (1,500 m)
Minimum bending radius: 15 × OD
Armour, strength member & mechanical duty: Extruded Polymeric Inner Bedding — Void-free high-pressure polyethylene inner jacket

Resistance

Seawater, hydrostatic & hydrolysis resistance: Engineered for continuous seawater immersion, pressure cycling and hydrolysis resistance per Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification
Oil, drilling mud & abrasion resistance: Resistant to marine hydraulic oils, salt mist, winch sheave wear and seabed abrasion per Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification
RoHS & REACH compliance: RoHS 2 (2011/65/EU + 2015/863) & REACH SVHC compliant

Reference standards

Governing standard: Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification
Environmental & test standards: IEC 60228 / IEC 60794 / ITU-T G.972 / IEEE 1580 / EN 10204
Quality management & inspection: ISO 9001:2015 & EN 10204 3.1 factory routine inspection

Identification

Model designation: Seal 428 Lead-In
Sheath colour & metre marking: Continuous metre-marked black outer finish (300–570 kN Multi)
Customs tariff (HS): 8544.49 / 8544.60 / 8544.70

Sizes

3 standard Seal 428 Lead-In subsea & offshore configurations

Manufactured to Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification for subsea, oceanographic, ROV, seismic and offshore applications.

Dimensions, tensile load & weights
Order designation	Configuration	Core / stranding	Outer Ø ≈ mm	Net weight ≈ kg/km	Breaking / tensile kN ≈	Min. bend R mm
Seal 428 Lead-In Construction Schedule (−30…+80 °C)
Seal 428 Lead-In 4–12F EOM/Sub	4–12 × ITU-T G.652D / G.654E SM (+ Power)	Laser-welded SS FIMT + Steel/Aramid Armour	8.2	260	48.0	125
Seal 428 Lead-In 24–48F EOM/Sub	24–48 × ITU-T G.652D / G.654E SM (+ Power)	Laser-welded SS FIMT + Contra-Helical Steel	17.5	680	120.0	260
Seal 428 Lead-In 96–192F Trunk	96–192 × ITU-T G.654E / G.652D Submarine	SS Tube + Steel Vault + Cu Tube + DA Armour	28.0	1,650	300.0	420

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
Custom core cross-sections, pair/fibre counts, armour breaking loads and continuous winch/seabed lengths available per Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification.

Electrical, optical & thermal parameters
Configuration	Max. DC R₂₀ / Atten. Ω/km or dB/km	Rating / Impedance	Operating temp.
4–12 × ITU-T G.652D / G.654E SM (+ Power)	0.35	≤0.35 dB/km @ 1310 nm	−30…+80 °C
24–48 × ITU-T G.652D / G.654E SM (+ Power)	0.21	≤0.21 dB/km @ 1550 nm	−30…+80 °C
96–192 × ITU-T G.654E / G.652D Submarine	0.18	≤0.18 dB/km @ 1550 nm	−30…+80 °C

Every production length undergoes routine conductor DC resistance, high-voltage dielectric or OTDR continuity and dimensional verification.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

ConductorClass 5 stranding
Spark test100 % in-line
Lay-upCores, earth, fillers
SheathingInner, braid / screen, outer
Electrical testsAC voltage, resistance
DimensionsOD, wall thickness
Inspection documents & dispatchDrum & dispatch

Testing & inspection	Test value / reference	Frequency
Routine tests
Conductor resistance, optical OTDR continuity & dimensional verification (Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification)	DC resistance at 20 °C / optical attenuation and outer diameter within Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification tolerances	Every manufactured drum length
High-voltage dielectric & insulation resistance test (Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification)	Zero dielectric breakdown and verified insulation resistance for 500 V DC rating	Every manufactured drum length
Sample tests
Hydrostatic pressure, tensile breaking load & water-blocking qualification (Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification)	Verified subsea pressure integrity, torque-balanced tensile performance and thermal stability across −30…+80 °C	Type qualification & periodic lot audit

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

Seal 428 / 300–570 kN Lead-In CompliantEN 10204 3.1 Factory Test CertificateCE, RoHS 2 (2011/65/EU) & REACH

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX Seal 428 Lead-In Seal 428 / 300–570 kN Lead-In 500 V DC CE

Delivery form: Heavy-duty export fumigated wooden drums, steel oceanographic winch reels or submarine turntables
Standard lengths: 500 m, 1,000 m, 3,000 m, 6,000 m or custom continuous subsea lengths
MOQ: 100 m (standard configurations) · 500 m (custom subsea builds)
Lead time: 2–6 weeks ex-works
Incoterms: EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFSeal 428 500 V DC 300–570 kN Heavy Multi-Layer Steel-Armoured 3D Seism – technical datasheet3 sizes · construction, technical data, approvals XLSXSeal 428 Lead-In spec data (Excel)All 3 sizes with dimensions and data, for your BOM or quotation

Revision: 2026-10-26
Updated: 2026-10-26

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

What governing standard and construction define Seal 428 Lead-In (Seal 428 500 V DC 300–570 kN Heavy Multi-Layer Steel-Armoured 3D Seismic Streamer Lead-In Cable)?

Seal 428 Lead-In (Seal 428 500 V DC 300–570 kN Heavy Multi-Layer Steel-Armoured 3D Seismic Streamer Lead-In Cable) is manufactured in accordance with Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification for 500 V DC service over -30 to +80 °C. Its 4-layer construction comprises high-speed single-mode optical unit, large-section copper power buses (6 cores) and 300–570 kn multi-layer steel wire armour.

What is the minimum bending radius and operating temperature range for Seal 428 Lead-In?

The minimum bending radius for Seal 428 Lead-In is 15 × OD across its continuous operating temperature range of -30 to +80 °C, ensuring mechanical, hydrostatic and dielectric reliability in subsea and offshore service.

How are the concentric layers of Seal 428 Lead-In arranged from inside to outside?

From inside to outside, the construction sequence is: (01) High-Speed Single-Mode Optical Unit — Central stainless-steel tube housing single-mode telemetry fibers; (02) Large-Section Copper Power Buses (6 Cores) — Stranded copper conductors with XLPE/PE insulation feeding streamer array; (03) Extruded Polymeric Inner Bedding — Void-free high-pressure polyethylene inner jacket; (04) 300–570 kN Multi-Layer Steel Wire Armour — Contra-helical preformed heavy galvanized steel wire armour (1,500 m).

What factory test certificates are supplied with Seal 428 Lead-In?

Every production drum of Seal 428 Lead-In undergoes routine conductor resistance/OTDR continuity, high-voltage dielectric and dimensional testing per Seal 428 (300/470/570 kN, 1,500 m) Heavy-Armoured Seismic Electro-Optical Lead-In Specification, and is delivered with an EN 10204 3.1 factory test certificate.

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01Selected sizes

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03Message for our engineers

Seal 428 500 V DC 300–570 kN Heavy Multi-Layer Steel-Armoured 3D Seismic Streamer Lead-In Cable

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