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Why does PIKE Technologies use Indium in sealing the ATR crystal?

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Why does PIKE Technologies use Indium in sealing the ATR crystal?

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PIKE Technologies Horizontal ATR trough plates feature a unique crystal seal. The crystal is attached to the plate mechanically and sealed with an indium gasket. Thanks to this design, the plate is completely leak-proof and works well at high and low temperatures. No O-rings, glue or epoxy resins are used in the crystal plate assembly. Indium is a very soft, silvery-white metal with brilliant luster. Its foil has been found to be an excellent gasket material. The foil is placed between the crystal and the supporting plate and then clamped. The low tensile strength of the foil allows it to flow into the gaps between the clamped materials, assuring intimate mechanical and thermal contact everywhere on the interface. Indium sealing characteristics are not affected by temperature changes and the foil gasket can withstand any temperature below its melting point of 156.6 degrees Celsius, down to very low cryogenic temperatures. And why is it important that no O-rings or epoxies are used in t

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