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Indium Paste/Indium Wire

Updated: 2026-08-10

Overview

Indium sludge and indium wire are derived from the rare, soft metal indium, primarily extracted as a byproduct of zinc and lead refining. Indium sludge is an intermediate product containing impurities, while indium wire is a high-purity form used in precision applications. Indium's unique properties, such as its low melting point and ability to adhere to glass, make it indispensable in electronics. The sludge is typically processed further to extract pure indium, whereas the wire is directly used in manufacturing processes.

Physical and Chemical Properties

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Pure indium is silvery-white and highly malleable, with a density of 7.31 g/cm³. It remains stable in air but forms oxides when heated. Indium wire is prized for its ductility and conductivity, while sludge varies in composition based on its source. Indium dissolves in acids but resists alkalis. Its low melting point (156.6°C) allows it to be easily alloyed with other metals, enhancing properties like solderability. The sludge often contains traces of other metals, requiring purification to achieve industrial-grade indium.

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Main Applications

Indium wire is critical in producing transparent conductive coatings for LCDs and touchscreens, as well as in semiconductor doping. Alloys with indium are used in low-temperature solders and fusible safety devices. Indium sludge is recycled to recover pure indium, reducing waste in refining processes. Both forms are vital in thin-film technologies, such as photovoltaic cells and LED production, where indium's conductivity and adhesion properties are unmatched.

Safety and Storage

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Indium metal poses minimal toxicity but should be handled with gloves to avoid skin irritation. Sludge may contain hazardous impurities, necessitating proper ventilation and protective equipment during processing. Store indium products in dry, sealed containers away from oxidizers. Wire should be kept coiled to prevent deformation, while sludge requires airtight packaging to prevent oxidation or contamination.

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B2B Procurement Guide

When sourcing indium wire, prioritize suppliers offering 99.99% purity or higher, verified by assay certificates. For sludge, confirm refining capabilities and impurity profiles to ensure cost-effective processing. Prices fluctuate based on global indium supply, often tied to zinc production. Long-term contracts may stabilize costs. Consider regional logistics, as indium is predominantly sourced from China, Canada, and South Korea.

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