Indium · Origin deep dive

Exports move from zinc-smelter refineries in Hunan, Yunnan and Guangxi through Shanghai and Guangzhou air and container gateways.

Standard 99.99% (4N) indium ingot, upgradeable to 5N-7N for compound-semiconductor use, sold against strict impurity certificates.

Kilogram-scale ingot lots in small containerized or air-freight parcels, subject to China's dual-use export-licence scrutiny on the watchlist.

ITO sputtering-target makers, indium-phosphide wafer producers, and solder and low-melting-alloy manufacturers in Northeast Asia.

Demand tracks display and semiconductor fab cycles rather than seasons, with quarterly contract pricing and spot top-ups.

Placement on China's export-control watchlist means indium could follow gallium and germanium into formal licensing at any point.

Refined units from Korea Zinc's Onsan complex and Japanese refiners such as Dowa ship via Busan and Japanese container ports.

High-purity 4N-6N ingot with impeccable traceability, preferred by ITO and semiconductor buyers qualifying non-Chinese supply chains.

Delivered air or container shipments direct to target makers, with short supply chains inside the Northeast Asian display cluster.

Japanese and Korean ITO target manufacturers and display makers, plus compound-semiconductor fabs paying a supply-security premium.

Cadence follows display-panel production cycles and annual target-maker contracts, with restocking ahead of new fab line ramps.

Limited zinc-smelter byproduct capacity caps ex-China growth, so any Chinese licensing shock lands on a structurally thin alternative pool.

Spent sputtering targets loop through recycling plants in Japan, Korea and China, co-located with the display-manufacturing clusters they serve.

Reclaimed indium re-refined to 4N-plus ingot, with recovery from spent ITO targets supplying a majority of Japanese consumption.

Closed-loop tolling between target makers and recyclers, with spent-target return flows moving in small containerized or domestic truck lots.

The ITO target makers themselves, who recycle their own grinding scrap and spent targets back into fresh sputtering material.

Recycling volume mirrors display fab utilization with a lag, since spent-target generation follows sputtering throughput rather than any season.

The loop depends on display production staying in Northeast Asia; fab relocations or thrifting of ITO layers would shrink recoverable feed.