CRYO-NETIC® is our proprietary cryogenic nickel-iron soft magnetic alloy that is ideal for shielding unwanted magnetic fields at extremely low temperatures down to 4 Kelvin (liquid helium). CRYO-NETIC Chemical Composition (% by weight) Nickel Why do MuMetal and Co-Netic not perform at cryogenic temperatures? Our high permeability MuMetal® and Co-Netic® alloys have an optimal temperature range in which the permeability peaks. The permeability of these alloys begins to drop below -40°C, making it unsuitable in low temperature applications. Permeability change with temperature: Room Temp (293K) Our specialized pure and dry hydrogen furnace program for annealing CRYO-NETIC last for over 36 hours within a varying temperature range of 392°F (200°C) to 2102°F (1150°C) with a long cooling time to achieve a typical permeability of 70,000 at 4K (applied field .005 Oe). Common Applications • • • • • High Energy Physics Superconducting RF cavities Cryomodules Outer space applications Vacuum chambers