Hastelloy Discs

Lenox Laser, Inc. was commissioned by NASA to laser drill precision 19.5 micron holes in Hastelloy discs for a helium leak detector which was to be utilized by the Galileo Spacecraft to Jupiter.
Hastelloy is the registered trademark name of Haynes International, Inc. and is applied as the prefix name of a range of over 20 different highly corrosion-resistant metal alloys. Hastelloys are also referred to as super alloys or high performance alloys by the metallurgical industry.
The predominant alloying ingredient is typically nickel. Other alloying ingredients are added to nickel in varying percentages of the elements molybdenum, chromium, cobalt, iron, copper, manganese, titanium, zirconium, aluminum, carbon and tungsten.
The primary function of the Hastelloy super alloys is that of effective survival under high temperature, high stress service in a moderately to severe corrosive and/or erosion prone environment (not unlike that of Jupiter) where common and less expensive iron based alloys would fail.