China tightens export reviews on indium ingots, a critical semiconductor material, as global buyers seek alternative sources amid supply uncertainty.

China's customs authorities significantly tightened reviews of indium ingot exports in August 2026, generating widespread concern among overseas buyers. European purchasers were required to disclose end-user information including facility location, while a major North American buyer reported that approval times extended from same-day processing to several days, describing conditions as "tense." Although indium ingot metal itself does not appear on China's formal export control list, buyers suspect these measures signal a prelude to stricter restrictions.

The scrutiny reflects indium ingot's strategic importance to global technology supply chains. China produces approximately 70 percent of the world's indium ingot, the raw material for indium phosphide semiconductors essential to AI data center optical chips. The U.S. Defense Logistics Agency has already solicited proposals to stockpile up to 403 tons of indium ingot over three years, underscoring supply security concerns.

July 2026 export data revealed the suppressive effect of heightened customs review: China shipped approximately 20 tons of unwrought and wrought indium ingot and related products, up marginally from 16 tons in June but dramatically below historical norms on a year-on-year basis. Overseas buyers, facing supply security concerns, actively pursued alternative sources and speculated that the new reporting requirements could precede an outright export ban.

A significant domestic development provided a counterweight to export restrictions. On August 31, Feinan Resources announced the formal commencement of mass production at its 4N7 refined indium ingot facility, successfully producing its first batch of high-purity indium ingot at 99.997 percent purity. This breakthrough represents a substantial advance in China's high-purity indium ingot capacity, as purification technology involves formidable technical barriers and few domestic enterprises operate at scale. Recycled indium ingot has begun contributing as a marginal supply source.

Supply-demand dynamics are expected to remain tight through 2027, driven by rising AI-related demand for optical chips and persistent export control uncertainty. While high-purity capacity breakthroughs may alleviate domestic structural shortages, overseas buyers face continued access uncertainty regarding Chinese indium ingot supplies.