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Product

Medical Micro-Coaxial & Ultra-High-Vacuum CablesUHV ≤ 10⁻¹⁰ mbar TriaxPEEK · > 10¹⁴ Ω IsolationfA / pA Electrometer Guard

310-PEEK50-TRIAX PEEK-Insulated UHV Triaxial CableUHV ≤ 10⁻¹⁰ mbar · 50 Ω ± 3 Ω · Ø 2.95 mm · Ag-Cu center · Virgin PEEK · Driven guard +

310-PEEK50-TRIAX is a 50 Ω ultra-high-vacuum (UHV ≤ 10⁻¹⁰ mbar), radiation-hard (10⁷ Gy / 10 MGy), and ultra-high-insulation-resistance (> 10¹⁴–10¹⁵ Ω) miniature triaxial cable insulated with virgin polyetheretherketone (PEEK) for femtoampere/picoampere

EMC screen
Low-EMC design
Flame-retardant
Approved
Order designation
310-PEEK50-TRIAX Virgin PEEK UHV Triax
Outer Ø ≈
2.95 mm
Metal weight
11.5 kg/km
Total weight ≈
19.5 kg/km
Min. bend R (fixed)
18 mm
All sizes (4)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Impedance Z₀
50 Ω ± 3 Ω
Center to inner driven-guard braid
Vacuum rating
≤ 10⁻¹⁰ mbar UHV
Halogen-free virgin PEEK polymer
Insulation R
> 10¹⁴ Ω·m
Enables < 10 fA leakage with guard
Temp. range
-65 to +250 °C
Continuous UHV bakeout compatible
Radiation dose
Up to 10⁷ Gy
10 MGy gamma / X-ray / electron
Outer diameter
2.95 mm (0.116")
26 AWG (19×0.10) Ag-Cu center

Typical values for this cable type, based on UHV Triaxial Spec (≤ 10⁻¹⁰ mbar) / IEC 61196-1 — confirmed in the datasheet and quotation for your order.

Application fit

Is 310-PEEK50-TRIAX right for your machine?

Purpose-built for Keithley/Keysight picoammeter & electrometer driven-guard circuits, synchrotron diamond/photodiode X-ray beam position monitors, Faraday cups, SEM/TEM electron detectors, and

Fixed installation

Suitable

Extruded virgin PEEK dielectric and jacket have near-zero moisture uptake (< 0.1 %) and zero virtual leaks in UHV.

Switchgear & control cabinet wiring

Suitable

Driven inner guard braid eliminates cable leakage current and capacitive charging delay on fA/pA sensors.

Furnace, kiln & high-temp zone

Suitable

Semicrystalline PEEK (melting point +343 °C) sustains +250 °C UHV chamber bakeouts without deformation.

Energy chain / drag chain

With conditions

High-modulus PEEK requires ≥ 18 mm (6×D) static and ≥ 30 mm (10×D) dynamic bend radius on in-vacuum stages.

Typical machinesSynchrotron X-Ray Beam Position MonitorsFemtoampere / Picoampere ElectrometersFaraday Cups & Ionization ChambersNuclear & Particle Accelerator DetectorsUHV Scanning Electron & Ion Microscopes

Construction

Layer by layer

26 AWG (19×0.10 mm, Ø 0.48 mm) silver-plated oxygen-free copper center conductor, Ø 1.45 mm extruded virgin PEEK inner dielectric, ≥ 90 %

123456
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Stranded Ag-OFC center conductor (2619 × 0.10 mm (Ø 0.48 mm, 0.15 mm²) hydrocarbon-free silver-plated oxygen-free copperUHV Triax Spec
2Virgin PEEK core dielectricPrecision melt-extruded unreinforced polyetheretherketone (PEEK, Ø 1.45 mm, εr ≈ 3.2, >UHV Triax Spec
3Inner driven-guard braid (Screen 1)0.10 mm silver-plated oxygen-free copper wire braid (≥ 90 % coverage) held at guardUHV Triax Spec
4Virgin PEEK inter-shield isolation wallExtruded PEEK isolation layer (Ø 2.15 mm, > 1.5 kV breakdown between inner guard andUHV Triax Spec
5Outer EMC & chamber ground braid0.10 mm silver-plated oxygen-free copper outer braid (≥ 90 % coverage) tied to vacuumUHV Triax Spec
6Virgin PEEK UHV outer jacketSmooth natural tan-brown polyetheretherketone (PEEK) outer sheath, Ø 2.95 mm ± 0.10 mmUHV Triax Spec

310-PEEK50-TRIAX (Smooth PEEK Outer, Ø 2.95 mm)

Standard UHV triaxial cable with extruded PEEK inner dielectric, PEEK inter-shield wall, and PEEK outer

310-PEEK50-TRIAX-S (With 316L SS Overbraid, Ø 3.25 mm)

Adds an external non-magnetic AISI 316L stainless-steel braid over the PEEK jacket for mechanical abrasion

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on UHV Triaxial Spec (≤ 10⁻¹⁰ mbar) / IEC 61196-1. Values for your order are confirmed in the datasheet and quotation.

Electrical

Characteristic impedance Z₀
50 Ω ± 3 Ω (center to inner guard)
Capacitance (center to inner guard)
102.0 pF/m (31.1 pF/ft)
Velocity of propagation (VoP)
66.0 %
Volume resistivity (PEEK dielectric)
> 10¹⁵ Ω·cm (insulation R > 10¹⁴ Ω·m)
Max. operating voltage (core-guard)
1,000 V DC / 750 V rms AC
Guard-to-outer shield voltage
500 V DC (1.5 kV rms test)

Thermal

Operating temperature range
-65 °C to +250 °C continuous
PEEK crystalline melting point
+343 °C (glass transition Tg +143 °C)
UHV bakeout temperature
+200 °C to +250 °C continuous
Outgassing (ASTM E595 / ECSS)
TML < 0.15 % · CVCM < 0.01 %
UHV pressure rating
≤ 1 × 10⁻¹⁰ mbar
Flammability rating
UL 94 V-0 self-extinguishing without halogens

Mechanical

Center conductor stranding
19 × 0.10 mm Ag-OFC (26 AWG, Ø 0.48 mm)
Inner dielectric diameter
1.45 mm ± 0.05 mm
Outer jacket diameter
2.95 mm ± 0.10 mm (0.116 in)
Min. bend radius (fixed / dynamic)
18 mm (6×D) / 30 mm (10×D)
Nominal cable weight
19.5 kg/km
Connector compatibility
UHV 3-lug TRB, LEMO 00/0S Triax, Sub-Triax

Resistance

Ionizing radiation resistance
Up to 10⁷ Gy (10 MGy) without embrittlement
Halogen & fluorine content
0.00 % (eliminates HF/F₂ beamline corrosion)
Chemical & solvent resistance
Inert to almost all organic/inorganic
Water absorption
< 0.1 % (5× lower than polyimide in humid
Wear & cut-through resistance
High-strength semi-crystalline PEEK
RoHS / REACH status
RoHS 3 compliant

Reference standards

Vacuum outgassing standard
ASTM E595 / ECSS-Q-ST-70-02
Triaxial transmission norm
IEC 61196-1
Polymer material standard
ASTM D4000 / ISO 22391 virgin PEEK
Conductor standard
ASTM B298 oxygen-free silver-plated Cu
Beamline radiation reference
CERN / APS / ESRF UHV material list
Quality certification
UHV cleanroom certificate + > 10¹⁴ Ω IR

Identification

Dielectric & jacket colour
Natural tan / light brown PEEK
Packaging
Ultrasonically cleaned & double-bagged for
Surface finish
Smooth extruded non-porous PEEK
Standard lengths
5 m, 10 m, 25 m, 50 m, 100 m
Cable designation
310-PEEK50-TRIAX UHV 50 Ω
Batch traceability
Cleanroom lot number & electrometer test ID

Sizes

4 standard configurations (310-PEEK50-TRIAX)

Dimensional, physical and high-frequency electrical parameters for 310-PEEK50-TRIAX per UHV Triaxial Spec (≤ 10⁻¹⁰ mbar) / IEC 61196-1.

Dimensions & construction
Order designationConstruction / VariantConductorOuter Ø ≈
mm		Metal
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard 310-PEEK50-TRIAX variants
310-PEEK50-TRIAX Virgin PEEK UHV Triax50 Ω Dual Ag-Cu Braids (PEEK)26 AWG (19×0.10 Ag-Cu)2.9511.519.518
310-PEEK50-TRIAX-S With 316L SS Overbraid50 Ω Dual Braids + PEEK + 316L SS26 AWG (19×0.10 Ag-Cu)3.2511.527.020
301-KAP50 Polyimide UHV Coaxial (Ø 1.95 mm)50 Ω Single Ag-Cu Braid (Polyimide)24 AWG (19×0.12 Ag-Cu)1.956.210.512
301-KAP50-S Polyimide + 316L SS Coaxial50 Ω Ag-Cu Braid + 316L SS Overbraid24 AWG (19×0.12 Ag-Cu)2.256.216.814
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Dimensions and weights are nominal production values subject to manufacturing tolerances per UHV Triaxial Spec (≤ 10⁻¹⁰ mbar) / IEC 61196-1.

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.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
100 % electrometer insulation resistance & HV> 10¹⁴ Ω core-to-guard at 500 V DC; 1.5 kV rms AC testEvery coil
TDR characteristic impedance (core to guard)50 Ω ± 3 Ω across full lengthEvery coil
Sample tests
UHV outgassing (ASTM E595) & RGA scanTML < 0.15 %, CVCM < 0.01 %, zero halogen or hydrocarbon peaksPer batch
10 MGy gamma irradiation & +250 °C bakeoutRetains dielectric integrity and > 10¹⁴ Ω resistanceQualification

Inspection certificate

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

Product approvals

UHV ≤ 10⁻¹⁰ mbar Certified> 10¹⁴ Ω Electrometer Grade10 MGy Radiation-Hard

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX 310-PEEK50-TRIAX 50 OHM UHV PEEK
Delivery form
Spools, reels or export wooden drums
Standard reel lengths
100 m · 305 m (1000 ft) · 500 m · 1000 m
MOQ
100 m (stock) · 305–500 m (production)
Lead time
1–3 weeks ex-works
Incoterms
EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDF310-PEEK50-TRIAX PEEK-Insulated UHV Triaxial Cable – technical datasheet4 sizes · construction, technical data, approvalsXLSX310-PEEK50-TRIAX spec data (Excel)All 4 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

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

Why is a triaxial cable required instead of a coaxial cable for femtoampere (fA) and picoampere (pA) current measurements?
In a standard coaxial cable, any bias voltage between the center conductor and grounded braid drives Ohm's-law leakage current across the insulation; in 310-PEEK50-TRIAX, the electrometer drives the inner braid (guard) to the exact same potential as the center conductor (0 V drop across the inner PEEK core), reducing cable leakage current and effective cable capacitance to near zero while the outer braid shields against EMI.
What advantages does extruded PEEK offer over tape-wrapped polyimide in UHV beamlines?
Melt-extruded virgin PEEK forms a monolithic, seamless tube with zero overlapping tape seams that could trap air pockets (virtual leaks), absorbs 5× less atmospheric moisture than polyimide during air exposure (< 0.1 %), and provides > 10¹⁵ Ω·cm volume resistivity. Each production reel undergoes sweep-frequency impedance and return-loss verification, dielectric spark testing, and dimensional inspection before dispatch with an EN 10204 3.1 test certificate.
Why must PTFE coaxial cables be avoided inside synchrotron X-ray and electron beamlines?
PTFE degrades rapidly above 1 kGy of ionizing radiation and releases fluorine radicals that etch UHV beryllium windows, X-ray mirrors, and ion pumps; PEEK contains only carbon, hydrogen, and oxygen and survives up to 10 MGy (10⁷ Gy). Each production reel undergoes sweep-frequency impedance and return-loss verification, dielectric spark testing, and dimensional inspection before dispatch with an EN 10204 3.1 test certificate.
Which UHV connectors mate with 310-PEEK50-TRIAX?
310-PEEK50-TRIAX terminates directly into UHV PEEK- or alumina-insulated 3-lug TRB triaxial plugs, LEMO 00/0S triaxial connectors, and custom CF-flange UHV triaxial feedthroughs. Each production reel undergoes sweep-frequency impedance and return-loss verification, dielectric spark testing, and dimensional inspection before dispatch with an EN 10204 3.1 test certificate.

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310-PEEK50-TRIAX PEEK-Insulated UHV Triaxial Cable

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