FLEXIBLE CRYOGENIC COAXIAL CABLES
Designed for Quantum Precision at Cryogenic Temperatures
In quantum research, precision, stability, and reliability are non-negotiable. CryoFlex RF cables are engineered to perform under the most demanding cryogenic conditions, maintaining exceptional flexibility down to the millikelvin range.
Whether in dilution refrigerators, compact experimental setups, or mobile quantum systems, our non-magnetic cable solutions—such as MK5005, MK5001, and Stormflex047NM—minimize interference and mechanical stress, ensuring clean signal transmission where it matters most.
CryoFlex is the trusted choice for researchers pushing the boundaries of quantum science.
Have you discovered our new E-BOOK yet?
Discover how our flexible coaxial cables deliver reliable performance in the most demanding cryogenic applications.
Structure
Features
Cryogenic cable assembly from 300 K to mK
A typical cryogenic setup gradually transmits RF signals from room temperature down to the millikelvin range.
The key factor here is selecting the right cable for each temperature stage:
Cryogenic semirigid cables are used from 300 K to 77 K.
In the range from 40 K to 4 K, cryogenic semirigid cables or flexible Stormflex cables are used, depending on the mechanical requirements. For the final range from 4 K to mK, MK5005 or Stormflex034CRYO are particularly suitable, as minimal thermal conductivity, high flexibility, and stable electrical properties are crucial here.
This creates a coordinated cable path for sensitive measurement setups in cryostats, quantum computing systems, and low-temperature test environments.
Product Variants
| Description | Order No. | Outer Diameter | Dielectric Mat. | Material Inner Conductor | Material Outer Conductor |
|---|---|---|---|---|---|
| SS405NM | 17390 | 2.65 | PTFE | Silver-plated Copper | Copper-tinned Braid |
| Stormflex047CRYO | 20020 | 1.40 | PTFE | Stainless Steel | Stainless Steel |
| MK5005CRYOAGED | 20984 | 0.52 | FEP LN-Coating | Silver-plated Copper | Silver-plated Copper |
| Stormflex034 | 22256 | 0.95 | PTFE | solid silver-plated copper-clad steel | SPSS Flat Wire Braid |
FAQs
Flexible Coaxial Cables feature a flexible outer conductor made of metallic braid (StCuAg or CuAg) and foil structures.
The dielectric consists of FEP or PTFE materials. These cables allow flexible routing and are particularly suitable for applications involving repeated movement.
The smallest outer diameter is 0.8 mm.
Semi-Rigid Coaxial Cables feature a solid, tubular metallic outer conductor made of stainless steel or copper.
The outer conductor ensures consistent cable geometry, resulting in a tightly controlled characteristic impedance.
The smallest outer diameter of semi-rigid coaxial cables is 0.51 mm.
Yes, absolutely. We supply both bulk cable and fully customized, ready-to-use cable assemblies.
- Suitable connectors: Assembled with cryogenic or non-magnetic connectors (e.g. SMA, 2.92 mm, SMP).
- Tested quality: Individual test reports for attenuation and return loss (VSWR) are available upon request.
- Bundle options: Also available as multi-channel cable bundles, including non-magnetic versions with low thermal conductivity.
Recommended Cleaning Procedure for Vacuum Applications
1. Initial Cleaning
Remove dust and particles using oil-free compressed air or dry nitrogen.
Then clean the cable with lint-free wipes.
2. Degreasing
Clean with high-purity isopropyl alcohol (IPA, 99.9%) or acetone, provided that all materials used are compatible with the solvent.
Do not use cleaning agents containing oils, silicones, or other substances that may leave residues.
3. Fine Cleaning
Perform a final cleaning using fresh lint-free wipes and clean solvent.
Wear powder-free nitrile gloves during cleaning to prevent fingerprints and contamination.
4. Drying
Allow the cable to dry completely in air or use dry nitrogen.
No solvent residue should remain on the cable.
5. Optional Bake-Out
For high-vacuum or ultra-high-vacuum (UHV) applications, a bake-out at 100°C to 150°C may be appropriate, provided that the cable and connector materials are approved for these temperatures.
Additional Recommendations for Ultra-High Vacuum (UHV)
- Avoid direct skin contact after cleaning.
- Fit cleaned cables with protective caps and package them in a particle-free environment until installation.
- For extended storage, keep cables in a clean and dry environment.
- Avoid oil-based products, silicone-containing lubricants, and contaminated compressed air.
Material Considerations
For vacuum and UHV applications, we recommend cable constructions using low-outgassing materials such as PTFE, FEP, or PFA insulation, combined with vacuum-compatible connectors. Materials with high outgassing characteristics, such as PVC or unsuitable plasticizers, should be avoided.
Important Notice:
Final approval for use in your vacuum system remains the responsibility of the system operator, as acceptable cleanliness requirements may vary depending on the vacuum level and process. We therefore recommend performing all cleaning and qualification procedures in accordance with your internal vacuum and UHV guidelines.
- Bulk lengths / straight lengths:
- Semi-rigid cables are typically supplied in standard straight lengths from 1.525 m to 3.05 m (5 to 10 feet). Coils of up to 50 ft are also available upon request.
- Flexible and hand-formable versions are also available on reels in longer continuous lengths.
- Cable assemblies: Custom cable assemblies are manufactured to your exact length specifications, ranging from 25 mm to 15 metres.
Yes. For magnetic-field-sensitive environments (such as quantum computing, MRI systems, or high-precision research magnets), we offer specially certified non-magnetic cables and connectors:
- Materials: Bare copper, silver-plated copper, tin-plated copper
Not sure yet which cryogenic cable is the right choice for your setup?
During our technical consultation, we help you identify the solution that best matches your frequency range, thermal requirements, and mechanical specifications.
