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Product

subsea ROV umbilical, AUV tether & sonar tow cable TIA-568 / DNV Subsea300 V (-30 to +75 °C)Subsea / Marine Outer Protective She

Buoyant-Slim 4.0mm Ultralight TetherTIA-568 / DNV Subsea — 300 V — -30 to +75 °C Subsea & Marine Cable

Buoyant-Slim 4.0mm Ultralight Tether featuring stranded copper twisted pairs (2×2) and subsea / marine outer protective sheath (TIA-568 / DNV Subsea, 300 V, -30 to +75 °C, min. bend radius 5 × OD).

Water-resistant

EMC screen

Outdoor & humid

Approved

Configuration

Order designation: Buoyant-Slim 4.0mm Micro Tether 1×2×22AWG RS-485
Outer Ø ≈: 8.2 mm
Net weight ≈: 92 kg/km
Max. pulling ≈: 2.0 kN
Core / stranding: Stranded SnCu + Foam PE + Foil/Braid

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: 300 V
Operating temp.: −30…+75 °C
Min. bend radius: 5 × OD
Core / conductor: Stranded Copper
Outer protection: Subsea / Marine
Standard: TIA-568 / DNV Su

Typical values for this cable type, based on DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard — confirmed in the datasheet and quotation for your order.

Application fit

Is Buoyant-Slim 4.0mm Micro Tether right for your machine?

Immersion & wet locations

Suitable

Hydrolysis-resistant subsea PUR or HDPE outer sheath and water-blocked core interstices withstand continuous deep-ocean hydrostatic immers

Vertical / spreader reel

Suitable

Contra-helical galvanized steel wire armour or high-modulus aramid/LCP braid supports vertical traction winches, TMS cages and tow sheaves

Free-hanging vertical run

Suitable

Torque-balanced armour or neutrally buoyant foamed-PUR jacket prevents hockling and kinking during free-swimming ROV and tether excursions

Offshore platform & shipboard deck trays

Suitable

Resists seawater, marine bio-fouling, hydraulic oil, UV radiation and abrasion across vessel A-frames and launch-and-recovery systems (LAR

Energy chain / drag chain

Not suitable

Subsea ROV umbilicals and tow cables are optimized for winch deployment and water-column catenaries rather than high-speed factory drag ch

Use Drag-Chain Feeder Cable

Typical machinesUnderwater & Ocean ExplorationWork-Class & Observation ROV Umbilicals and TMS TethersOffshore Aquaculture Net Cleaners & Subsea Cage InspectionAUV, Ocean Glider & Expendable Spool-Payoff Micro-TethersUSV Towed Sonar Arrays, Seabed Crawlers & Subsea Trenchers

Construction

Layer by layer

Shown: Buoyant-Slim 4.0mm Micro Tether (DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard) featuring stranded copper twisted pairs (2×2), aramid / lcp braided strength member and subsea / marine outer protective sheath (3-layer construction).

Buoyant-Slim 4.0mm Micro Tether — stepped horizontal cutaway showing Stranded Copper Twisted Pairs (2×2) and Subsea / — Layer cutaway

#	Layer	Material & reference
1	Stranded Copper Twisted Pairs (2×2)	Twisted pairs with Low-capacitance cellular Foam-Skin PE insulation
2	Aramid / LCP Braided Strength Member	High-tenacity synthetic fiber braid absorbing dynamic tension
3	Subsea / Marine Outer Protective Sheath	Blue neutrally buoyant cellular foamed Polyurethane (Foamed PUR) outer sheath

Buoyant-Slim 4.0mm Micro Tether — Standard Subsea & Marine Execution

Built to DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard with stranded copper twisted pairs (2×2) and subsea / marine outer protective sheath

Buoyant-Slim 4.0mm Micro Tether — Custom Winch Length / Molded Termination

Available on continuous export winch drums or factory-terminated with subsea wet-mate / mechanical sockets

Buoyant-Slim 4.0mm Micro Tether — Hydrostatic & Routine Certified

Supplied with EN 10204 3.1 routine dielectric, conductor/optical continuity & hydrostatic qualification report

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage / operating system: 300 V (DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard)
Core / conductor construction: Stranded Copper Twisted Pairs (2×2) — Twisted pairs with Low-capacitance cellular Foam-Skin PE insulation
Primary dielectric / optical buffer: Aramid / LCP Braided Strength Member — High-tenacity synthetic fiber braid absorbing dynamic tension

Thermal

Continuous operating temperature: −30…+75 °C (submerged seawater & topside deck service)
Hydrostatic & thermal cycling endurance: Verified cold-bend and wet dielectric stability across −30…+75 °C per DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard
Storage & transport temperature: −40…+80 °C on export wooden/steel cable drum

Mechanical

Outer jacket / sheath protection: Subsea / Marine Outer Protective Sheath — Blue neutrally buoyant cellular foamed Polyurethane (Foamed PUR) outer sheath
Minimum bending radius: 5 × OD
Reinforcement / screen / bedding layer: Aramid / LCP Braided Strength Member — High-tenacity synthetic fiber braid absorbing dynamic tension

Resistance

Seawater, hydrolysis & oil resistance: Resistant to permanent seawater immersion, hydrolysis, hydraulic oil and bio-fouling per DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard
Hydrostatic pressure & water blocking: Radial and longitudinal water-blocking integrity verified per DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard
RoHS & REACH compliance: RoHS 2 (2011/65/EU + 2015/863) & REACH SVHC compliant

Reference standards

Governing standard: DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard
Subsea & conductor qualification standards: IEC 60228 / DNV-ST-E402 / ISO 13628-5 / IEC 60794 / EN 10204
Quality management & inspection: ISO 9001:2015 & EN 10204 3.1 factory routine inspection

Identification

Model designation: Buoyant-Slim 4.0mm Micro Tether
Sheath colour & metre marking: Continuous metre-marked yellow outer finish (Subsea / Marine )
Customs tariff (HS): 8544.49 / 8544.60 / 8544.70

Sizes

3 standard Buoyant-Slim 4.0mm Micro Tether configurations

Manufactured to DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard for subsea robotics, ROV umbilicals, marine aquaculture and offshore sensor applications.

Dimensions, tensile load & weights
Order designation	Configuration	Core / stranding	Outer Ø ≈ mm	Net weight ≈ kg/km	Max. pulling kN ≈	Min. bend R mm
Buoyant-Slim 4.0mm Micro Tether Construction Schedule (−30…+75 °C)
Buoyant-Slim 4.0mm Micro Tether 1×2×22AWG RS-485	1 × 2 × 0.34 mm² (22 AWG) + Power Pair	Stranded SnCu + Foam PE + Foil/Braid	8.2	92	2.0	50
Buoyant-Slim 4.0mm Micro Tether 4×2×24AWG Cat5e	4 × 2 × 24 AWG Subsea Gigabit Ethernet	Stranded SnCu + High-Pressure PE + SF/UTP	9.6	125	3.5	60
Buoyant-Slim 4.0mm Micro Tether 4×2×23AWG Cat6+2	4 × 2 × 23 AWG Cat6 + 2 × 1.5 mm² Power	Stranded SnCu + 600-Bar Matrix + PUR	12.8	215	6.8	78

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
Custom core counts, optical fiber channels, wet-mate terminations and continuous winch lengths available per DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard.

Electrical, optical & thermal parameters
Configuration	Max. DC R₂₀ Ω/km	Rating / Impedance / Load	Operating temp.
1 × 2 × 0.34 mm² (22 AWG) + Power Pair	55.00	300 V (120 Ω RS-485)	−30…+75 °C
4 × 2 × 24 AWG Subsea Gigabit Ethernet	84.00	300 V (100 Ω 1000BASE-T)	−30…+75 °C
4 × 2 × 23 AWG Cat6 + 2 × 1.5 mm² Power	72.00	300 V (100 Ω Cat6 6000m)	−30…+75 °C

Every production length undergoes routine conductor DC resistance / OTDR optical attenuation, AC dielectric 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 DC resistance / OTDR optical & dimensional check (DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard)	DC resistance at 20 °C, optical attenuation and wall thickness within DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard limits	Every manufactured drum length
AC high-voltage dielectric & insulation resistance test (DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard)	Zero dielectric breakdown and verified wet insulation resistance for 300 V rating	Every manufactured drum length
Sample tests
Hydrostatic pressure, tensile load & seawater immersion qualification (DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard)	Verified hydrostatic pressure integrity, breaking load and flex endurance across −30…+75 °C	Type qualification & periodic lot audit

Inspection certificate

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

Product approvals

TIA-568 / DNV Subsea 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 Buoyant-Slim 4.0mm Micro Tether TIA-568 / DNV Subsea 300 V CE

Delivery form: Heavy-duty export fumigated wooden drums, steel winch reels or pre-terminated subsea assemblies
Standard lengths: 500 m, 1,000 m, 3,000 m continuous winch lengths or custom cut-to-length subsea jumpers
MOQ: 100 m (standard configurations) · 300 m (custom subsea builds)
Lead time: 2–4 weeks ex-works
Incoterms: EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFBuoyant-Slim 4.0mm Ultralight Tether – technical datasheet3 sizes · construction, technical data, approvals XLSXBuoyant-Slim 4.0mm Micro Tether spec data (Excel)All 3 sizes with dimensions and data, for your BOM or quotation

Revision: 2026-10-29
Updated: 2026-10-29

FAQ

Questions engineers ask first

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

What governing standard and construction define Buoyant-Slim 4.0mm Micro Tether (Buoyant-Slim 4.0mm Ultralight Tether)?

Buoyant-Slim 4.0mm Micro Tether (Buoyant-Slim 4.0mm Ultralight Tether) is manufactured in accordance with DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard for 300 V subsea,ROV and marine aquaculture service over -30 to +75 °C. Its 3-layer construction comprises stranded copper twisted pairs (2×2), aramid / lcp braided strength member and subsea / marine outer protective sheath.

What is the minimum bending radius and operating temperature range for Buoyant-Slim 4.0mm Micro Tether?

The minimum bending radius for Buoyant-Slim 4.0mm Micro Tether is 5 × OD across its continuous operating temperature range of -30 to +75 °C, ensuring mechanical flex endurance and hydrostatic reliability in subsea winches, TMS cages and aquaculture installations.

How are the concentric layers of Buoyant-Slim 4.0mm Micro Tether arranged from inside to outside?

From inside to outside, the construction sequence is: (01) Stranded Copper Twisted Pairs (2×2) — Twisted pairs with Low-capacitance cellular Foam-Skin PE insulation; (02) Aramid / LCP Braided Strength Member — High-tenacity synthetic fiber braid absorbing dynamic tension; (03) Subsea / Marine Outer Protective Sheath — Blue neutrally buoyant cellular foamed Polyurethane (Foamed PUR) outer sheath.

What factory test certificates are supplied with Buoyant-Slim 4.0mm Micro Tether?

Every production drum of Buoyant-Slim 4.0mm Micro Tether undergoes routine conductor DC resistance / optical OTDR continuity, AC high-voltage dielectric and dimensional testing per DNV Subsea Buoyant-Slim 4.0mm Ultralight Aramid Mini-ROV Tether Standard, 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

Buoyant-Slim 4.0mm Micro Tether Buoyant-Slim 4.0mm Ultralight Tether

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