95Pb 5Sb

These spheres have very high thermal capacity and are used as packing or matrix in Regenerative Heat Exchangers/Thermal Regenerators within various types of Stirling, G-M, and Pulse Tube type cryocoolers, including second stage displacers. Their uniform shape and size provide strong geometrical arrangement in addition to precise area, volume, and porosity.
Also a semimetal, Lead Antimony is used in the semiconductor industry when reflow applications allow for ultra-clean soldering surfaces at or above 340°F (171°C).

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