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Iron-Chromium Foil (Light Tight) (Fe75-Cr25)
Available Configurations
Properties common to all products in this list
Key Features
Iron/Chromium Foil (Light Tight) (Fe75/Cr25) is a pinhole-free certified iron-chromium alloy foil combining the corrosion resistance and oxidation stability of a high-chromium ferritic composition with guaranteed through-thickness optical barrier integrity:
Pinhole-Free Certification
Each batch is tested and certified clear of through-thickness defects, ensuring reliable complete optical isolation in light-sensitive assemblies and photonic device housings where stray light admission would degrade measurement accuracy or experimental validity.
High Chromium Content for Corrosion and Oxidation Resistance
The 25% chromium content provides strong resistance to oxidation and atmospheric corrosion through formation of a stable Cr₂O₃ passive film, qualifying the light-tight foil for optical housings and experimental enclosures exposed to humid, chemically active, or elevated-temperature environments.
Ferromagnetic Character
The Fe75/Cr25 composition retains ferromagnetic character, qualifying this light-tight foil for magnetic shielding enclosures that simultaneously require optical isolation, or for magnetically actuated optical shutter assemblies where both magnetic response and light exclusion are required from the same foil component.
Good Mechanical Formability
The iron-chromium alloy foil can be formed, bent, and shaped to enclose irregular optical geometries while maintaining continuous through-thickness barrier integrity, allowing fabrication of conformal light-tight enclosures that match complex optical assembly profiles.
Stable Performance in High-Vacuum and Aerospace Optical Environments
Oxidation stability and corrosion resistance of the Fe75/Cr25 composition support use in aerospace optical housings and high-vacuum instrument enclosures where the light-tight element must maintain barrier integrity across a wide temperature range and under prolonged service exposure.
Industrial Applications
Iron/Chromium Foil (Light Tight) (Fe75/Cr25) is used wherever pinhole-free optical barrier integrity must be combined with the corrosion resistance, oxidation stability, and ferromagnetic character of the high-chromium Fe75/Cr25 composition:
- ✦ Optical Housings and Photonic Device Enclosures in Aerospace Applications
- Used for optical housings and photonic device enclosures in aerospace applications, where pinhole-free light exclusion, corrosion resistance, and formability to match complex optical assembly geometries are simultaneously required from the barrier foil.
- ✦ Shielding in High-Vacuum Optical Instrumentation
- Applied as shielding in high-vacuum optical instrumentation, where the Cr₂O₃ passive surface provides low outgassing relative to unpassivated iron foils, and the certified through-thickness barrier integrity ensures complete optical isolation in vacuum optical setups.
- ✦ Light-Tight Elements in Magnetic Shielding Enclosures
- Used as light-tight elements in magnetic shielding enclosures where both magnetic response and optical isolation are required, taking advantage of the ferromagnetic character of the Fe75/Cr25 composition to provide simultaneous magnetic and optical shielding in a single foil component.
- ✦ Protective Shielding in Sensitive Imaging and Microscopy Systems
- Applied as protective shielding in sensitive imaging and microscopy systems, where the combination of mechanical formability, corrosion resistance, and pinhole-free certified optical barrier integrity qualifies the foil for enclosures protecting photon-sensitive detector and imaging elements.
- ✦ Optical Calibration, Photodetector Testing and Optical Shielding Research
- Provides certified barrier foil for optical calibration chambers, photodetector testing setups, and shielding in sensitive spectroscopy and imaging systems, where guaranteed optical isolation and the corrosion-resistant character of the alloy allow extended laboratory service without barrier degradation.
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |