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Product

Metal-tube radiation-resistant optical cable FIMT Metal TubeGI 1300 nm Rad-HardØ 4.0 mm Compact

M-PAC 4.0 mm Metal-Tube Radiation-Resistant Optical CableIEC 60794-1 / TIA-455 · GI 1300 nm (≤1.0 dB/km) · -55 °C to +125 °C hermetic FIMT optical cable

Q: What applications is M-PAC 4.0 mm engineered for?

M-PAC 4.0 mm radiation-resistant communication and distributed sensing (DTS/DAS) optical cable enclosing graded-index radiation-hardened fibres inside a hermetic M-PAC metallic protection tube and a 4.0 mm black outer sheath with dual yellow stripes. It is built to IEC 60794-1-2 / ITU-T G.651.1 for nuclear power containment & spent-fuel monitoring and high-energy particle accelerators & synchrotron rings.

Q: What are the minimum bending radius and operating temperature range for M-PAC 4.0 mm?

The minimum bending radius for M-PAC 4.0 mm is 15–20 × OD across its continuous operating temperature range of -55 °C to +125 °C, ensuring mechanical and dielectric stability in industrial service.

Q: How are the concentric layers of M-PAC 4.0 mm arranged from inside to outside?

From inside to outside, the construction sequence is: (01) Radiation-Resistant Optical Fibres (Pure-silica / fluorine-doped graded-index (GI 1300 nm, attenuation <= 1.0 dB/km) radiation-hardened optical fibres for nuclear & accelerator zones); (02) M-PAC Metallic Protection Tube (Seamless laser-welded stainless metallic micro-tube (M-PAC) hermetically sealing fibres against hydrogen ingress, moisture, and radial crush); (03) Common Outer Sheath (Ø 4.0 mm) (Extruded black flame- and radiation-resistant thermoplastic outer jacket (nominal OD 4.0 mm, mass 25 kg/km)); (04) Longitudinal Identification Stripes (Dual opposing co-extruded yellow longitudinal identification stripes along the outer jacket for nuclear conduit tracing).

Q: What factory test certificates are supplied with M-PAC 4.0 mm?

Every production drum of M-PAC 4.0 mm undergoes routine electrical continuity, high-voltage dielectric and dimensional testing per IEC 60794-1-2 / ITU-T G.651.1, and is delivered with an EN 10204 3.1 factory test certificate.

Water-resistant

Flame-retardant

Ozone, UV & moisture

Approved

Configuration

Order designation: M-PAC 4.0 mm 4F GI Rad-Hard
Outer Ø ≈: 4.0 mm
Weight ≈: 25 kg/km
Tensile load ≈: 1.2 kN
Core / stranding: Hermetic metal tube + black/yellow jacket

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: Optical Fibre
Operating temp.: −55…+125 °C
Min. bend radius: 15–20 × OD
Core / conductor: 2–12 × Rad FO
Outer protection: FIMT Ø 4.0 mm
Standard: IEC 60794-1

Typical values for this cable type, based on IEC 60794-1-2 / ITU-T G.651.1 — confirmed in the datasheet and quotation for your order.

Application fit

Is M-PAC 4.0 mm right for your machine?

Fixed installation

Suitable

Hermetic laser-welded metal tube blocks hydrogen ingression, moisture and radial crushing in nuclear ducts.

Furnace, kiln & high-temp zone

Suitable

Radiation-hardened doped/pure-silica fibres maintain low RIA (radiation-induced attenuation) up to +125 °C.

TBM gantry & advancing tunnel reel

Suitable

Compact 4.0 mm outer diameter routes easily through stainless instrumentation conduits and reactor penetrations.

Energy chain / drag chain

Not suitable

Work-hardening metallic protection tube is for static or low-cycle installation, not high-cycle drag chains.

ZW-(QG)GNOTKSdD

Typical machinesOil & Gas CableNuclear Power Containment & Spent-Fuel MonitoringHigh-Energy Particle Accelerators & Synchrotron RingsDistributed Temperature & Acoustic Sensing (DTS / DAS)Downhole Geothermal, Oilfield & Defense Telemetry

Construction

Layer by layer

Shown: M-PAC 4.0 mm (IEC 60794-1-2 / ITU-T G.651.1) featuring radiation-resistant optical fibres, m-pac metallic protection tube and longitudinal identification stripes (4-layer construction).

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	Radiation-Resistant Optical Fibres	Pure-silica / fluorine-doped graded-index (GI 1300 nm, attenuation <= 1.0 dB/km) radiation-hardened optical fibres for nuclear & accelerator zonesIEC 60794-1-2 / ITU-T G.651.1
2	M-PAC Metallic Protection Tube	Seamless laser-welded stainless metallic micro-tube (M-PAC) hermetically sealing fibres against hydrogen ingress, moisture, and radial crushIEC 60794-1-2 / ITU-T G.651.1
3	Common Outer Sheath (Ø 4.0 mm)	Extruded black flame- and radiation-resistant thermoplastic outer jacket (nominal OD 4.0 mm, mass 25 kg/km)IEC 60794-1-2 / ITU-T G.651.1
4	Longitudinal Identification Stripes	Dual opposing co-extruded yellow longitudinal identification stripes along the outer jacket for nuclear conduit tracingIEC 60794-1-2 / ITU-T G.651.1

M-PAC 4.0 mm — Standard Execution

Built to IEC 60794-1-2 / ITU-T G.651.1 with radiation-resistant optical fibres and longitudinal identification stripes

M-PAC 4.0 mm — Custom Length & Configuration

Available in custom drum lengths, core counts or factory-terminated assemblies

M-PAC 4.0 mm — Factory Routine Certified

Supplied with EN 10204 3.1 routine electrical, dielectric & dimensional inspection report

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 60794-1-2 / ITU-T G.651.1. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage / transmission duty: Optical Fibre (IEC 60794-1-2 / ITU-T G.651.1)
Core / conductor construction: Radiation-Resistant Optical Fibres — Pure-silica / fluorine-doped graded-index (GI 1300 nm, attenuation <= 1.0 dB/km) radiation-hardened optical fibres for nuclear & accelerator zones
Primary dielectric / insulation: M-PAC Metallic Protection Tube — Seamless laser-welded stainless metallic micro-tube (M-PAC) hermetically sealing fibres against hydrogen ingress, moisture, and radial crush

Thermal

Continuous operating temperature: −55…+125 °C (rated operating envelope)
Storage & transport temperature: −40…+80 °C on export drum or reel

Mechanical

Outer protection / sheath: Longitudinal Identification Stripes — Dual opposing co-extruded yellow longitudinal identification stripes along the outer jacket for nuclear conduit tracing
Minimum bending radius: 15–20 × OD
Structural layer count: 4 concentric functional layers

Resistance

Environmental & chemical resistance: Industrial moisture, oils and mechanical wear per IEC 60794-1-2 / ITU-T G.651.1
RoHS & REACH compliance: RoHS 2 (2011/65/EU + 2015/863) & REACH SVHC compliant

Reference standards

Governing standard: IEC 60794-1-2 / ITU-T G.651.1
Quality management & inspection: ISO 9001:2015 & EN 10204 3.1 factory routine inspection

Identification

Model designation: M-PAC 4.0 mm
Customs tariff (HS): 8544.49 / 8544.60 / 8544.70

Sizes

3 standard M-PAC 4.0 mm configurations

Manufactured to IEC 60794-1-2 / ITU-T G.651.1 for heavy-duty industrial and specialty engineering systems.

Dimensions, tensile ratings & weights
Order designation	Configuration	Core / stranding	Outer Ø ≈ mm	Weight ≈ kg/km	Tensile load kN ≈	Min. bend R mm
M-PAC 4.0 mm Construction Schedule (−55…+125 °C)
M-PAC 4.0 mm 2F GI Rad-Hard	2 × 50/125 µm Rad-Hard GI	Hermetic metal tube + black/yellow jacket	4.0	24	1.2	60
M-PAC 4.0 mm 4F GI Rad-Hard	4 × 50/125 µm Rad-Hard GI	Hermetic metal tube + black/yellow jacket	4.0	25	1.2	60
M-PAC 4.0 mm 8F SM/GI Hybrid	4×SM Pure-Silica + 4×GI Rad-Hard	Hermetic metal tube + black/yellow jacket	4.0	26	1.2	60

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
Custom core counts, cross-sections, sheath colours and factory-tested cut lengths available per IEC 60794-1-2 / ITU-T G.651.1.

Electrical, optical & thermal parameters
Configuration	Max. DC R₂₀ / Atten. Ω/km or dB/km	Rating / Capacity	Operating temp.
2 × 50/125 µm GI (1300 nm)	0.95	≤1.0 dB/km @ 1300 nm	−55…+125 °C
4 × 50/125 µm GI (1300 nm)	0.95	≤1.0 dB/km @ 1300 nm	−55…+125 °C
4×SM + 4×GI Rad-Hard	0.45	≤0.45 dB/km @ 1550 nm / ≤1.0 @ 1300	−55…+125 °C

Every production length undergoes routine conductor DC resistance, high-voltage 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 resistance & dimensional verification (IEC 60794-1-2 / ITU-T G.651.1)	Electrical parameters and outer diameter within IEC 60794-1-2 / ITU-T G.651.1 tolerances	Every manufactured drum / length
High-voltage dielectric & insulation resistance test (IEC 60794-1-2 / ITU-T G.651.1)	Zero dielectric breakdown and verified insulation resistance over full length	Every manufactured drum / length
Sample tests
Thermal ageing, mechanical flexing & environmental qualification (IEC 60794-1-2 / ITU-T G.651.1)	Verified structural and dielectric integrity across −55…+125 °C	Type qualification & periodic lot audit

Inspection certificate

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

Product approvals

IEC 60794-1 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 M-PAC 4.0 mm IEC 60794-1 Optical Fibre CE

Delivery form: Heavy-duty export wooden/steel drums or factory-tested coils
Standard lengths: 100 m, 250 m, 500 m, 1,000 m or custom cut-to-length reels
MOQ: 100 m (standard configurations) · 300 m (custom builds)
Lead time: 2–4 weeks ex-works
Incoterms: EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFM-PAC 4.0 mm Metal-Tube Radiation-Resistant Optical Cable – technical datasheet3 sizes · construction, technical data, approvals XLSXM-PAC 4.0 mm spec data (Excel)All 3 sizes with dimensions and data, for your BOM or quotation

Revision: 2026-10-23
Updated: 2026-10-23

FAQ

Questions engineers ask first

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

What applications is M-PAC 4.0 mm engineered for?

M-PAC 4.0 mm radiation-resistant communication and distributed sensing (DTS/DAS) optical cable enclosing graded-index radiation-hardened fibres inside a hermetic M-PAC metallic protection tube and a 4.0 mm black outer sheath with dual yellow stripes. It is built to IEC 60794-1-2 / ITU-T G.651.1 for nuclear power containment & spent-fuel monitoring and high-energy particle accelerators & synchrotron rings.

What are the minimum bending radius and operating temperature range for M-PAC 4.0 mm?

The minimum bending radius for M-PAC 4.0 mm is 15–20 × OD across its continuous operating temperature range of -55 °C to +125 °C, ensuring mechanical and dielectric stability in industrial service.

How are the concentric layers of M-PAC 4.0 mm arranged from inside to outside?

From inside to outside, the construction sequence is: (01) Radiation-Resistant Optical Fibres (Pure-silica / fluorine-doped graded-index (GI 1300 nm, attenuation <= 1.0 dB/km) radiation-hardened optical fibres for nuclear & accelerator zones); (02) M-PAC Metallic Protection Tube (Seamless laser-welded stainless metallic micro-tube (M-PAC) hermetically sealing fibres against hydrogen ingress, moisture, and radial crush); (03) Common Outer Sheath (Ø 4.0 mm) (Extruded black flame- and radiation-resistant thermoplastic outer jacket (nominal OD 4.0 mm, mass 25 kg/km)); (04) Longitudinal Identification Stripes (Dual opposing co-extruded yellow longitudinal identification stripes along the outer jacket for nuclear conduit tracing).

What factory test certificates are supplied with M-PAC 4.0 mm?

Every production drum of M-PAC 4.0 mm undergoes routine electrical continuity, high-voltage dielectric and dimensional testing per IEC 60794-1-2 / ITU-T G.651.1, and is delivered with an EN 10204 3.1 factory test certificate.

Request a quote

Get an engineering quote for M-PAC 4.0 mm

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

01Selected sizes

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02Reel & motion

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

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03Message for our engineers

M-PAC 4.0 mm Metal-Tube Radiation-Resistant Optical Cable

Selected sizes:


Reel & motion:
- Reel type: 
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