Havar® Foil (Light Tight)

Havar® Foil (Light Tight) is a cobalt-based alloy foil engineered for high-strength, corrosion-resistant applications where non-magnetic and light-impermeable properties are essential. Its primary value lies in its exceptional mechanical resilience, with cold-reduced and heat-treated variants reaching tensile strengths up to 2.5 × 10⁹ dyne/cm². The alloy is particularly significant in medical isotope production, acting as a window material in cyclotron targets for ^18O-enriched water during ^18F production—critical for PET imaging. Metallurgical studies reveal its microstructural stability under irradiation, showing variance in dislocation density between annealed and cold-rolled states, which affects foil longevity in high-flux environments. Havar® also exhibits favorable stopping powers for light ions, with measured parameters aligning well with theoretical predictions, enabling its use in beamline diagnostics and energy filtering applications. The foil’s ability to maintain structural and shielding integrity under extreme proton flux positions it as a critical material in next-generation medical and nuclear systems.