Indium[4]

Updated: 2026-11-01

Overview

Indium is a rare, soft, silvery-white metal belonging to the post-transition metal group. Discovered in 1863, it is primarily extracted as a byproduct of zinc and lead refining. Due to its low melting point and high electrical conductivity, indium plays a crucial role in modern industrial applications. Despite its scarcity, indium’s unique properties make it indispensable in electronics. It is often alloyed with other metals to enhance performance in specific applications. The global supply of indium is limited, making procurement a strategic consideration for industries reliant on its properties.

Physical and Chemical Properties

Indium is known for its exceptional malleability and ductility, allowing it to be easily shaped into thin films or wires. Its low melting point (156.6°C) makes it ideal for low-temperature solders and fusible alloys. Chemically, indium is resistant to corrosion in air and water but reacts with acids. It forms compounds such as indium tin oxide (ITO), widely used in touchscreens and LCDs. The metal’s high electrical conductivity and optical transparency in thin layers further enhance its utility in advanced technologies.

Main Applications

Indium’s primary applications are in the electronics industry. Indium tin oxide (ITO) is a critical component in touchscreens, flat-panel displays, and solar panels due to its conductive and transparent properties. Additionally, indium is used in solders for its ability to form strong, low-melting-point bonds, crucial in semiconductor and microelectronics assembly. Thin-film coatings of indium enhance the durability and reflectivity of mirrors and optical components. Emerging uses include indium-based batteries and advanced alloys for aerospace applications.

Safety and Storage

Indium metal is generally considered low toxicity, but prolonged exposure to dust or fumes may cause respiratory or skin irritation. Workers handling indium should use protective gloves and ensure adequate ventilation. For storage, indium should be kept in a dry, cool environment, preferably sealed to prevent oxidation. Avoid contact with acids or strong oxidizing agents. Proper disposal methods should be followed to minimize environmental impact, as indium compounds can persist in ecosystems.

B2B Procurement Guide

When sourcing indium, purity (typically 99.97–99.999%) and supplier reliability are paramount. Industrial buyers should prioritize suppliers with ISO certification or equivalent standards to ensure material consistency. Procurement strategies should account for market volatility, as indium prices fluctuate based on demand from electronics manufacturers. Long-term contracts or partnerships with refiners can mitigate supply risks. Buyers should also verify compliance with environmental and trade regulations, particularly for international shipments.