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Product

High-temperature wire10⁻¹¹ mbar UHV Single-Core-269 °C to +250 °CSolid 311-KAP & Stranded 301-KAPM

311-KAP / 301-KAPM Polyimide UHV Single-Core Wire10⁻¹¹ mbar UHV polyimide single-core wire in solid (311-KAP) & stranded (301-KAPM)

311-KAP (solid) and 301-KAPM (19-strand flexible) ultra-high-vacuum single-core hook-up wires featuring silver-plated OFHC copper and ultra-thin wrapped aromatic polyimide insulation for 10⁻¹¹ mbar vacuum, 4 K (-269 °C) cryogenics, and +250 °C bakeout.

Approved
Flame-retardant
Ozone, UV & moisture
Order designation
301-KAPM-035 (Stranded Ø 0.35)
Outer Ø ≈
0.47 mm
Wall thickness
0.06 mm
Total weight ≈
0.9 kg/km
Min. bend R (fixed)
2 mm
All sizes (10)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Vacuum rating
≤ 10⁻¹¹ mbar
Ultra-low surface outgassing
Temperature
-269…+250 °C
4 K liquid He to +300 °C peak
Rated voltage
600 V DC
300 V AC · 2.0 kV test
Solid series
311-KAP
Ø 0.25 to 1.50 mm solid Ag-OFC
Stranded series
301-KAPM
19-wire flexible Ag-OFC
Wall thickness
0.05–0.08 mm
Ultra-thin fused polyimide film

Typical values for this cable type, based on ASTM E595 UHV Outgassing & MIL-DTL-81381 Polyimide Hook-Up Wire — confirmed in the datasheet and quotation for your order.

Application fit

Is 311-KAP / 301-KAPM right for your machine?

Specify 311-KAP for formable stay-in-place point-to-point UHV chamber wiring or 301-KAPM for flexible multi-strand leads on moving sample stages and Sub-D vacuum feedthroughs.

Furnace, kiln & high-temp zone

Suitable

Ultra-thin 50–80 µm aromatic polyimide wall outgasses rapidly during +250 °C bakeout to reach 10⁻¹¹ mbar base pressure.

Switchgear & control cabinet wiring

Suitable

Minimal insulation cross-section reduces thermal conduction into 4 K dilution refrigerators and cryo-pumped detector stages.

Fixed installation

Suitable

Available in solid (311-KAP) for rigid self-supporting routing and 19-strand (301-KAPM) for gold crimp pin termination.

Motorised monospiral reel

Not suitable

In-vacuum hook-up wire is designed for scientific vacuum chambers, not industrial reeling.

Use NSHTÖU for drum reeling
Typical machinesUHV Surface Science (XPS / STM)Cryogenic & 4 K Quantum SystemsSynchrotron Beamline DetectorsSemiconductor EUV LithographySpace Thermal-Vacuum Chambers

Construction

Layer by layer

Dual-construction UHV hook-up series: solid (311-KAP) or 19-strand (301-KAPM) silver-plated OFHC copper core with heat-sealed aromatic polyimide tape insulation.

123
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Solid or 19-strand Ag-OFC conductorOxygen-free high-conductivity copper with direct silver plating — solid wire (311-KAP) or 19-strand bundle (301-KAPM)Non-magnetic, ultra-low-resistivity conductor compatible with UHV crimp pins and spot welding
2Lapped aromatic polyimide filmHelically wrapped and thermally fused polyimide tape (0.05 mm to 0.08 mm radial wall)Provides > 150 kV/mm dielectric strength with minimal polymer mass inside the vacuum chamber
3Amber polyimide outer sealHeat-sealed amber polyimide outer surface with zero silicone or fluoropolymer topcoatEliminates trapped gas pockets and meets ASTM E595 (CVCM < 0.01 %) at 10⁻¹¹ mbar

311-KAP (Solid Ag-OFC)

Formable solid single-strand UHV wire (Ø 0.25, 0.50, 0.75, 1.00, 1.50 mm) that holds its bent shape inside vacuum chambers

301-KAPM (19-Strand Ag-OFC)

Flexible 19-strand UHV hook-up wire (Ø 0.25, 0.35, 0.50, 0.60, 0.75, 1.00 mm) for manipulators and D-Sub connectors

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on ASTM E595 UHV Outgassing & MIL-DTL-81381 Polyimide Hook-Up Wire. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated working voltage
600 V DC / 300 V AC rms
Dielectric withstand test
2,000 V AC rms (spark tested)
Dielectric strength (film)
≥ 180 kV/mm per ASTM D149
In-vacuum current rating
1.5 A (Ø 0.25 mm) to 14 A (Ø 1.50 mm)

Thermal

Continuous temperature range
-269 °C (4 K) to +250 °C
Short-term bakeout peak
+300 °C in ultra-high vacuum
Cryogenic cycling stability
No cracking from 4 K to +250 °C

Mechanical

Solid conductor diameters
Ø 0.25, 0.50, 0.75, 1.00, 1.50 mm (311-KAP)
Stranded conductor diameters
Ø 0.25, 0.35, 0.50, 0.60, 0.75, 1.00 mm (301-KAPM)
Min. bending radius
3 × OD (301-KAPM) · 5 × OD (311-KAP)

Resistance

Vacuum pressure rating
≤ 1 × 10⁻¹¹ mbar (UHV / XHV)
Radiation resistance
Up to 10⁷ Gy (10⁹ rad) ionizing dose
Flame & halogen rating
Non-flammable in air · halogen-free

Reference standards

UHV outgassing standard
ASTM E595 / ECSS-Q-ST-70-02C
Polyimide wire benchmark
MIL-DTL-81381 construction reference
RoHS & REACH
RoHS 3 & REACH compliant

Identification

Insulation colour
Natural translucent amber polyimide
Spool label
TEBAOFLEX 311-KAP / 301-KAPM UHV 1E-11 MBAR
Customs tariff (HS)
8544.49

Sizes

10 standard configurations (311-KAP / 301-KAPM)

Engineering dimensions, conductor stranding, mass and electrical ratings for 311-KAP / 301-KAPM per ASTM E595 UHV Outgassing & MIL-DTL-81381 Polyimide Hook-Up Wire.

Dimensions & weights
Order designationCross-section / sizeConductor buildWall ≈
mm		Outer Ø ≈
mm		Metal
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard 311-KAP / 301-KAPM configurations
311-KAP-025 (Solid Ø 0.25)0.049 mm² (30 AWG)1×0.25 mm Solid Ag-OFC0.050.350.50.62
311-KAP-050 (Solid Ø 0.50)0.196 mm² (24 AWG)1×0.50 mm Solid Ag-OFC0.060.621.82.23
311-KAP-075 (Solid Ø 0.75)0.442 mm² (21 AWG)1×0.75 mm Solid Ag-OFC0.060.874.14.75
311-KAP-100 (Solid Ø 1.00)0.785 mm² (18 AWG)1×1.00 mm Solid Ag-OFC0.071.147.28.16
311-KAP-150 (Solid Ø 1.50)1.767 mm² (15 AWG)1×1.50 mm Solid Ag-OFC0.081.6616.217.89
301-KAPM-025 (Stranded Ø 0.25)0.055 mm² (30 AWG)7×0.10 mm Ag-OFC0.050.360.50.72
301-KAPM-035 (Stranded Ø 0.35)0.073 mm² (28 AWG)19×0.07 mm Ag-OFC0.060.470.70.92
301-KAPM-050 (Stranded Ø 0.50)0.15 mm² (26 AWG)19×0.10 mm Ag-OFC0.060.621.41.83
301-KAPM-060 (Stranded Ø 0.60)0.22 mm² (24 AWG)19×0.12 mm Ag-OFC0.060.722.12.53
301-KAPM-100 (Stranded Ø 1.00)0.60 mm² (20 AWG)19×0.20 mm Ag-OFC0.071.145.76.55
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Outer diameters and weights are nominal engineering values for 311-KAP / 301-KAPM subject to standard manufacturing tolerances per ASTM E595 UHV Outgassing & MIL-DTL-81381 Polyimide Hook-Up Wire.

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
Dielectric spark / high-voltage withstand test100 % in-line spark and AC/DC dielectric withstand per ASTM E595 UHV Outgassing & MIL-DTL-81381 Polyimide Hook-Up WireEvery manufactured length
Conductor DC resistance & continuity checkWithin maximum 20 °C resistance limit specified for 311-KAP / 301-KAPMEvery spool or drum length
Sample tests
Thermal ageing & dimensional verificationWall thickness, concentricity and post-ageing elongation per ASTM E595 UHV Outgassing & MIL-DTL-81381 Polyimide Hook-Up WirePer production batch
Flame, outgassing or high-temperature enduranceQualified to ASTM E595 UHV Outgassing & MIL-DTL-81381 Polyimide Hook-Up Wire thermal and environmental performance criteriaType qualification

Inspection certificate

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

Product approvals

ASTM E595 UHV Outgassing & MIL-DTL-81381 Polyimide Hook-Up WireCE (2014/35/EU) & RoHS 3 (2015/863/EU) CompliantREACH SVHC & Halogen/Asbestos Compliance Verified

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX 311-KAP / 301-KAPM POLYIMIDE UHV 1E-11 MBAR
Delivery form
Precision spools, coils or export wooden drums
Standard lengths
50 m · 100 m · 500 m · 1000 m (or cut harnesses)
MOQ
100 m (stock sizes) · 300–500 m (custom build)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDF311-KAP / 301-KAPM Polyimide UHV Single-Core Wire – technical datasheet10 sizes · construction, technical data, approvalsXLSX311-KAP / 301-KAPM spec data (Excel)All 10 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.

What is the difference between 311-KAP and 301-KAPM UHV wire?
311-KAP uses a solid single-strand silver-plated OFHC copper conductor that holds its formed geometry when routed around vacuum chamber walls and shields. 301-KAPM uses a flexible 19-strand silver-plated OFHC copper conductor for dynamic sample stages, goniometers, and high-density Sub-D crimp connectors.
How is heat-dissipation current derating handled for 311-KAP and 301-KAPM inside vacuum?
Because convective air cooling is absent in ultra-high vacuum, heat leaves the wire only via thermal radiation and conduction to the terminations. Derate the free-air current by roughly 35–40 % in vacuum (as shown in our electrical table) to keep the polyimide surface well below +250 °C.
Why is the polyimide insulation wall so thin (0.05 to 0.08 mm)?
Aromatic polyimide has an exceptionally high dielectric breakdown strength (> 180 kV/mm), allowing a 50–80 µm wall to withstand 2,000 V AC testing while minimizing polymer volume, trapped gas, and pump-down time at 10⁻¹¹ mbar.
Can 301-KAPM be terminated with standard UHV gold-plated Sub-D crimp contacts?
Yes. Models 301-KAPM-035 (28 AWG), 301-KAPM-050 (26 AWG), and 301-KAPM-060 (24 AWG) are sized specifically to fit standard PEEK and ceramic Sub-D / Micro-D UHV male and female crimp pins.

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311-KAP / 301-KAPM Polyimide UHV Single-Core Wire

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