1 / 5

Product

LCP crush-proof neutrally buoyant deep-sea AUV/ROV tether3,000 m+ Deep-Sea AUV340 kgf LCP BraidSG 0.99 Buoyant Ø3.5mm

SPE-7098 Buoyant STFOC LCP-Braided Deep-Sea AUV/ROV Optical TetherITU-T G.657 / STFOC · 300/500 V · Lcp crush-proof neutrally buoyant deep-sea auv/rov

Buoyant STFOC (SPE-7098 / 7055 / 7094 / 7281 / 7229) Patented LCP Crush-Proof LCP-Braided Neutrally Buoyant Deep-Sea AUV/ROV Fiber-Optic Tether (ITU-T G.657 / STFOC, 300/500 V, -40 °C to +80 °C, min. bend radius 8 × OD).

Water-resistant

Anti-torsion braid

Outdoor & humid

Ozone, UV & moisture

Configuration

Order designation: SPE-7098 BUOYANT STFOC 4F Single-Mode OS2
Outer Ø ≈: 3.5 mm
Net weight ≈: 18 kg/km
Tensile rating ≈: 3.4 kN
Core / stranding: Hermetic / gel-filled optical core

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: 300/500 V
Operating temp.: −40…+80 °C
Min. bend radius: 8 × OD
Core / conductor: 1–4F Hermetic SM
Outer protection: 340 kgf LCP
Standard: ITU-T G.657

Typical values for this cable type, based on ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether — confirmed in the datasheet and quotation for your order.

Application fit

Is SPE-7098 BUOYANT STFOC right for your machine?

Immersion & wet locations

Suitable

Water-blocked core matrix and hydrolysis-resistant subsea jacketing withstand continuous deepwater hydrostatic pressure.

Vertical / spreader reel

Suitable

Torque-balanced aramid or contra-helical steel armour supports vertical winch deployment without hockling.

Offshore platform & shipboard deck trays

Suitable

Marine-grade outer sheath and armour package resist LARS sheave abrasion, UV exposure and salt-spray corrosion.

Trailing & towing

Suitable

High tensile breaking strength supports underwater towing, ROV excursion and seabed plough/trencher duty.

Energy chain / drag chain

Not suitable

Subsea umbilical and tow construction is not intended for high-cycle indoor factory drag chains.

Use Drag-Chain Servo Cable

Typical machinesMarine & Offshore CableWork-Class & Observation ROV SystemsOffshore Wind & Subsea Power GridsOceanographic, Sonar & Seismic SurveyCommercial Diving & Subsea Intervention

Construction

Layer by layer

Shown: SPE-7098 BUOYANT STFOC (ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether) featuring hermetically coated sm fiber, patented lcp inner tube (code a-27) and buoyant outer jacket (code x-137) (4-layer construction).

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	Hermetically Coated SM Fiber	Bend-insensitive single-mode fiber sealed against deep-sea water & H₂ darkening
2	Patented LCP Inner Tube (Code A-27)	Extruded Liquid Crystal Polymer (Ø 0.69 mm) crush-proof STFOC core
3	16-Carrier LCP Braid (Code O-55)	Precision braided LCP strength member rated to 750 lbs (340 kgf)
4	Buoyant Outer Jacket (Code X-137)	Low-density polymer jacket (Ø 3.5 mm, SG = 0.99 g/cm³) for neutral buoyancy

SPE-7098 BUOYANT STFOC — Standard Subsea & Marine Execution

Built to ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether with hermetically coated sm fiber and buoyant outer jacket (code x-137)

SPE-7098 BUOYANT STFOC — Custom Drum Length & Termination Kit

Available in custom continuous subsea/wellbore drum lengths or pre-terminated assemblies

SPE-7098 BUOYANT STFOC — Routine & Hydrostatic Test Certified

Supplied with EN 10204 3.1 routine dielectric, resistance & pressure/dimensional report

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage / transmission duty: 300/500 V (ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether)
Core / conductor construction: Hermetically Coated SM Fiber — Bend-insensitive single-mode fiber sealed against deep-sea water & H₂ darkening
Primary dielectric / buffering: Patented LCP Inner Tube (Code A-27) — Extruded Liquid Crystal Polymer (Ø 0.69 mm) crush-proof STFOC core

Thermal

Continuous operating temperature: −40…+80 °C (subsea, marine & submersible duty)
Short-circuit / peak thermal rating: Verified thermal stability per ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether
Storage & transport temperature: −40…+80 °C on export wooden/steel drum

Mechanical

Outer protection / armouring: Buoyant Outer Jacket (Code X-137) — Low-density polymer jacket (Ø 3.5 mm, SG = 0.99 g/cm³) for neutral buoyancy
Minimum bending radius: 8 × OD
Hydrostatic, tensile & crush duty: 16-Carrier LCP Braid (Code O-55) — Precision braided LCP strength member rated to 750 lbs (340 kgf)

Resistance

Hydrostatic pressure & water blocking: Engineered for continuous submersion and hydrostatic integrity per ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether
Seawater, oil & chemical resistance: Resistant to seawater hydrolysis, hydraulic oils and abrasion per ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether
RoHS & REACH compliance: RoHS 2 (2011/65/EU + 2015/863) & REACH SVHC compliant

Reference standards

Governing standard: ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether
Environmental & test standards: IEC 60228 / IEC 60332 / ISO 13628-5 / EN 10204
Quality management & inspection: ISO 9001:2015 & EN 10204 3.1 factory routine inspection

Identification

Model designation: SPE-7098 BUOYANT STFOC
Sheath colour & metre marking: Continuous metre-marked yellow outer finish (340 kgf LCP + X-137)
Customs tariff (HS): 8544.49 / 8544.60 / 8544.70

Sizes

3 standard SPE-7098 BUOYANT STFOC subsea & marine configurations

Manufactured to ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether for subsea, offshore, deep-well and marine applications.

Dimensions, tensile load & weights
Order designation	Configuration	Core / stranding	Outer Ø ≈ mm	Net weight ≈ kg/km	Tensile rating kN ≈	Min. bend R mm
SPE-7098 BUOYANT STFOC Construction Schedule (−40…+80 °C)
SPE-7098 BUOYANT STFOC 4F Single-Mode OS2	4 × G.652.D / G.657.A2 SM (200 kpsi)	Hermetic / gel-filled optical core	3.5	18	3.4	35
SPE-7098 BUOYANT STFOC 12F Single-Mode OS2	12 × G.652.D / G.657.A2 SM (200 kpsi)	Hermetic / gel-filled optical core	9.8	145	18.0	98
SPE-7098 BUOYANT STFOC 24F Armoured Subsea	24 × G.652.D SM + Strength Armour	Subsea pressure-resistant optical unit	17.0	580	95.0	255

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 grades and factory drum lengths available per ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether.

Electrical, optical & thermal parameters
Configuration	Max. DC R₂₀ / Atten. Ω/km or dB/km	Rating / Impedance	Operating temp.
4 × G.652.D / G.657.A2 SM (200 kpsi)	0.35	≤0.35 dB/km @ 1310 nm	−40…+80 °C
12 × G.652.D / G.657.A2 SM (200 kpsi)	0.22	≤0.22 dB/km @ 1550 nm	−40…+80 °C
24 × G.652.D SM + Strength Armour	0.20	≤0.20 dB/km @ 1550 nm	−40…+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, continuity & dimensional verification (ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether)	DC resistance at 20 °C / optical attenuation and outer diameter within ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether tolerances	Every manufactured drum length
High-voltage dielectric & insulation resistance test (ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether)	Zero dielectric breakdown and verified insulation resistance for 300/500 V rating	Every manufactured drum length
Sample tests
Hydrostatic pressure, water-blocking & mechanical endurance qualification (ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether)	Verified submersion integrity, tensile load and thermal stability across −40…+80 °C	Type qualification & periodic lot audit

Inspection certificate

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

Product approvals

ITU-T G.657 / STFOC 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 SPE-7098 BUOYANT STFOC ITU-T G.657 / STFOC 300/500 V CE

Delivery form: Heavy-duty export fumigated wooden drums or steel subsea reels
Standard lengths: 500 m, 1,000 m or custom continuous subsea/wellbore lengths
MOQ: 100 m (standard configurations) · 500 m (custom builds)
Lead time: 2–5 weeks ex-works
Incoterms: EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFSPE-7098 Buoyant STFOC LCP-Braided Deep-Sea AUV/ROV Optical Tether – technical datasheet3 sizes · construction, technical data, approvals XLSXSPE-7098 BUOYANT STFOC spec data (Excel)All 3 sizes with dimensions and data, for your BOM or quotation

Revision: 2026-10-25
Updated: 2026-10-25

FAQ

Questions engineers ask first

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

What governing standard and construction define SPE-7098 BUOYANT STFOC (SPE-7098 Buoyant STFOC LCP-Braided Deep-Sea AUV/ROV Optical Tether)?

SPE-7098 BUOYANT STFOC (SPE-7098 Buoyant STFOC LCP-Braided Deep-Sea AUV/ROV Optical Tether) is manufactured in accordance with ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether for 300/500 V service over -40 °C to +80 °C. Its 4-layer construction comprises hermetically coated sm fiber, patented lcp inner tube (code a-27) and buoyant outer jacket (code x-137).

What is the minimum bending radius and operating temperature range for SPE-7098 BUOYANT STFOC?

The minimum bending radius for SPE-7098 BUOYANT STFOC is 8 × OD across its continuous operating temperature range of -40 °C to +80 °C, ensuring mechanical and dielectric reliability in subsea, marine and submersible service.

How are the concentric layers of SPE-7098 BUOYANT STFOC arranged from inside to outside?

From inside to outside, the construction sequence is: (01) Hermetically Coated SM Fiber — Bend-insensitive single-mode fiber sealed against deep-sea water & H₂ darkening; (02) Patented LCP Inner Tube (Code A-27) — Extruded Liquid Crystal Polymer (Ø 0.69 mm) crush-proof STFOC core; (03) 16-Carrier LCP Braid (Code O-55) — Precision braided LCP strength member rated to 750 lbs (340 kgf); (04) Buoyant Outer Jacket (Code X-137) — Low-density polymer jacket (Ø 3.5 mm, SG = 0.99 g/cm³) for neutral buoyancy.

What factory test certificates are supplied with SPE-7098 BUOYANT STFOC?

Every production drum of SPE-7098 BUOYANT STFOC undergoes routine conductor resistance/continuity, high-voltage dielectric and dimensional testing per ITU-T G.657 / US Pat. 7,570,853 LCP Crush-Proof Tether, and is delivered with an EN 10204 3.1 factory test certificate.

Request a quote

Get an engineering quote for SPE-7098 BUOYANT STFOC

Your selection and application details are copied into the enquiry form below.

01Selected sizes

Use + Add next to a size or configuration.

02Reel & motion

Add your operating conditions here to include them in your enquiry.

Reel typeDrum core diameter (mm)Cable length on drum (m)Travel speed (m/min)Max. accelerationCycles per hourLength and quantityAmbient temperatureExposure (outdoor, water, oil, abrasion)Destination countryEquipment and operating conditions

03Message for our engineers

SPE-7098 Buoyant STFOC LCP-Braided Deep-Sea AUV/ROV Optical Tether

Selected sizes:


Reel & motion:
- Reel type: 
- Drum core diameter (mm): 
- Cable length on drum (m): 
- Travel speed (m/min): 
- Max. acceleration: 
- Cycles per hour: 
- Length and quantity: 
- Ambient temperature: 
- Exposure (outdoor, water, oil, abrasion): 
- Destination country: 
- Equipment and operating conditions:

Send via WhatsApp