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Product

High-temperature wireASTM E595 UHV (10⁻¹⁰ mbar)-269 °C to +250 °C9 to 50-Way Ribbon

301-KAP-RIB Polyimide Ultra-High-Vacuum Ribbon Cable10⁻¹⁰ mbar UHV flat polyimide ribbon cable with 28 AWG Ag-OFC copper (-269 to +250 °C)

301-KAP-RIB ultra-high-vacuum (UHV) flat ribbon cable engineered with parallel 28 AWG (Ø 0.25 mm) silver-plated OFHC copper conductors and low-outgassing aromatic polyimide film insulation for 10⁻¹⁰ mbar chambers and 4 K to +250 °C bakeouts.

Approved
Flame-retardant
Ozone, UV & moisture
Order designation
301-KAP-RIB25 (25-Way)
Outer Ø ≈
26.20 mm
Wall thickness
0.06 mm
Total weight ≈
31.8 kg/km
Min. bend R (fixed)
5 mm
All sizes (9)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Vacuum rating
10⁻¹⁰ mbar UHV
ASTM E595 TML < 1 % certified
Temperature
-269…+250 °C
4 K liquid He to +250 °C bake
Rated voltage
250 V AC / 300 V
1000 V AC dielectric test
Conductor
Ag-Cu 28 AWG
Ø 0.25 mm solid or 7-strand
Insulation
Polyimide film
Vented low-outgassing PI web
Way counts
9 to 50 ways
Mates UHV Sub-D 9/15/25/37/50

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

Application fit

Is 301-KAP-RIB right for your machine?

Designed specifically for multi-channel in-vacuum wiring between UHV Sub-D feedthrough flanges, piezo nanopositioners, beamline diagnostics, and cryostat stages.

Switchgear & control cabinet wiring

Suitable

Parallel flat ribbon geometry terminates cleanly to UHV PEEK or ceramic Sub-D 9, 15, 25, 37, and 50-pin crimp connectors.

Furnace, kiln & high-temp zone

Suitable

Withstands repeated +200 °C to +250 °C UHV chamber bakeout cycles without outgassing hydrocarbon or silicone contaminants.

Fixed installation

Suitable

Operates from 4 K (-269 °C) cryogenic stages up to +250 °C in synchrotrons, MBE chambers, and space simulation vessels.

Motorised monospiral reel

Not suitable

Precision 28 AWG UHV ribbon cable is for in-vacuum instrumentation harnessing only, not industrial power reeling.

Use 301-KAPM-PAIR for flexible pairs
Typical machinesSynchrotron & Particle BeamlinesSemiconductor EUV & MBE ChambersSpace Thermal-Vacuum (TVAC) TestingCryogenic 4 K Dilution RefrigeratorsSurface Science (XPS / ARPES / STM)

Construction

Layer by layer

301-KAP-RIB UHV ribbon architecture: parallel 28 AWG silver-plated OFHC copper conductors insulated with aromatic polyimide film and bonded into a slotted low-outgassing ribbon web.

123
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Silver-plated OFHC copper array28 AWG (Ø 0.25 mm solid or 7×0.127 mm stranded, 0.08–0.09 mm²) silver-plated oxygen-free copperSilver plating prevents copper oxidation during +250 °C bakeouts and lowers RF skin resistance
2Aromatic polyimide core dielectricFused ultra-thin aromatic polyimide (PI) film wall (0.06 mm radial thickness)Ultra-low outgassing (TML < 1.0 %, CVCM < 0.1 %) and radiation stability up to 10⁷ Gy
3Slotted UHV polyimide ribbon webBonded amber polyimide carrier film with periodic vacuum-ventilation slotsEliminates virtual leaks (trapped gas pockets) for rapid pump-down to 10⁻¹⁰ mbar

301-KAP-RIB (Solid 0.25 mm)

Form-holding solid 28 AWG silver-plated copper UHV ribbon in 9, 15, 25, 37, and 50 ways

301-KAPM-RIB (Stranded)

Multistrand flexible 28 AWG (7×0.127 mm or 19×0.07 mm) UHV ribbon for moving sample stages

Technical data

Ratings & operating limits

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

Electrical

Max. operating voltage
250 V AC / 300 V DC in vacuum
Dielectric test voltage
1000 V AC rms (1 min)
Max. current per conductor
1.5 A in vacuum (+20 °C) · 2.5 A in air
Conductor DC resistance
≤ 220 Ω/km at +20 °C (28 AWG Ag-Cu)

Thermal

Operating temperature range
-269 °C (4 K) to +250 °C continuous
Max. UHV bakeout temperature
+250 °C (+300 °C short-term peak)
Vacuum thermal derating
Derate current by 40 % in UHV (no convection)

Mechanical

Conductor size & pitch
28 AWG (0.08–0.09 mm²) · 1.00 / 1.27 mm pitch
Ribbon thickness
0.40 mm nominal flat profile
Min. bending radius
3 mm static fold · 10 × thickness flexing

Resistance

Vacuum outgassing (ASTM E595)
TML < 1.0 %, CVCM < 0.05 % (UHV < 10⁻¹⁰ mbar)
Radiation resistance
Up to 10⁷ Gy (10 MGy) gamma / electron
Halogen & silicone free
100 % free of silicone & halogens

Reference standards

Outgassing qualification
ASTM E595 / ECSS-Q-ST-70-02C
Wire specification basis
MIL-DTL-81381 polyimide Ag-Cu wire
Cleanroom & UHV preparation
Ultrasonically cleaned & UHV bag sealed

Identification

Ribbon colour
Translucent amber polyimide with edge marker
Package labelling
TEBAOFLEX 301-KAP-RIB-[Ways] UHV CLEANED
Customs tariff (HS)
8544.49

Sizes

9 standard configurations (301-KAP-RIB)

Engineering dimensions, conductor stranding, mass and electrical ratings for 301-KAP-RIB per ASTM E595 UHV Outgassing / MIL-DTL-81381.

Dimensions & weights
Order designationCross-section / sizeConductor buildWall ≈
mm		Outer Ø ≈
mm		Metal
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard 301-KAP-RIB configurations
301-KAP-RIB9 (9-Way)9×0.08 mm² (28 AWG)9 × Ø 0.25 mm Ag-Cu0.069.506.811.55
301-KAP-RIB10 (10-Way)10×0.08 mm² (28 AWG)10 × Ø 0.25 mm Ag-Cu0.0610.507.612.85
301-KAP-RIB15 (15-Way)15×0.08 mm² (28 AWG)15 × Ø 0.25 mm Ag-Cu0.0615.8011.419.05
301-KAP-RIB20 (20-Way)20×0.08 mm² (28 AWG)20 × Ø 0.25 mm Ag-Cu0.0621.0015.225.45
301-KAP-RIB25 (25-Way)25×0.08 mm² (28 AWG)25 × Ø 0.25 mm Ag-Cu0.0626.2019.031.85
301-KAP-RIB37 (37-Way)37×0.08 mm² (28 AWG)37 × Ø 0.25 mm Ag-Cu0.0638.8028.147.05
301-KAP-RIB50 (50-Way)50×0.08 mm² (28 AWG)50 × Ø 0.25 mm Ag-Cu0.0652.5038.063.55
301-KAPM-RIB15 (15-Way Flex)15×0.09 mm² (28 AWG)15 × (19×0.07) Ag-Cu0.0716.5012.821.54
301-KAPM-RIB25 (25-Way Flex)25×0.09 mm² (28 AWG)25 × (19×0.07) Ag-Cu0.0727.5021.335.84
  • 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 301-KAP-RIB subject to standard manufacturing tolerances per ASTM E595 UHV Outgassing / MIL-DTL-81381.

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-81381Every manufactured length
Conductor DC resistance & continuity checkWithin maximum 20 °C resistance limit specified for 301-KAP-RIBEvery spool or drum length
Sample tests
Thermal ageing & dimensional verificationWall thickness, concentricity and post-ageing elongation per ASTM E595 UHV Outgassing / MIL-DTL-81381Per production batch
Flame, outgassing or high-temperature enduranceQualified to ASTM E595 UHV Outgassing / MIL-DTL-81381 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-81381CE (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 301-KAP-RIB25 UHV 1E-10 MBAR 250C
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

PDF301-KAP-RIB Polyimide Ultra-High-Vacuum Ribbon Cable – technical datasheet9 sizes · construction, technical data, approvalsXLSX301-KAP-RIB spec data (Excel)All 9 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 polyimide film preferred over PTFE or silicone for 10⁻¹⁰ mbar ultra-high-vacuum (UHV) ribbon cables?
Silicone elastomers outgas siloxanes that contaminate UHV optics and semiconductor wafers, while PTFE suffers cold flow and decomposes under synchrotron X-ray/electron radiation. Aromatic polyimide film achieves an outgassing rate below 10⁻¹⁰ mbar·L/(s·cm²), withstands +250 °C bakeouts, and resists 10⁷ Gy ionizing radiation.
How does 301-KAP-RIB prevent virtual leaks during vacuum chamber pump-down?
The polyimide carrier web bonding the parallel insulated conductors incorporates periodic ventilation slots and peelable conductor grooves so no dead-ended air pockets remain trapped between wires or inside crimp connectors.
Why must conductor current ratings be derated inside a vacuum chamber?
In ultra-high vacuum (below 10⁻⁴ mbar), convective air cooling is completely absent and heat dissipates only by thermal radiation and axial conduction along the copper wire. A 28 AWG conductor rated 2.5 A in free air is therefore limited to 1.5 A continuous in UHV.
How do I separate individual wires at the end of 301-KAP-RIB for Sub-D crimp pins?
Score the thin polyimide web between adjacent conductors with a clean scalpel blade over the last 20–30 mm, strip 3–4 mm of polyimide insulation with a precision thermal or blade stripper, and crimp gold-plated UHV Sub-D contacts.

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301-KAP-RIB Polyimide Ultra-High-Vacuum Ribbon Cable

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