Technology
Indium is a soft silvery metal that bonds to glass
HERE’S THE INTERESTING PART
Finding a metal that plays nice with smooth silica is notoriously difficult. Indium is bizarrely soft; you can physically bite into it like bubblegum. When rubbed against an ultra-smooth surface like glass, it physically 'wets' and bonds to the pane, creating an instant vacuum-tight metallic seal without requiring any heat or external adhesives.
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