China to curb sulfuric acid exports

China is shutting off sulfuric acid exports from May, with one carveout for electronic-grade material used in chipmaking, according to reports on April 10. The cutoff hits a chemical that sits near the start of fertilizer production, metal processing, oil refining, and other factory chains. (bloomberg.com) (britannica.com) Sulfuric acid is not a niche lab reagent; Encyclopaedia Britannica calls it one of the most widely manufactured industrial chemicals in the world. The United States Environmental Protection Agency says phosphate fertilizer production usually takes the biggest share of sulfuric acid demand, historically about 60% to 75% of domestic consumption. (britannica.com) (epa.gov) That is why a sulfuric acid export curb lands first on farms. Sulfuric acid is used to make phosphoric acid, and phosphoric acid is the feedstock for many phosphate fertilizers sold to growers. (epa.gov) The chemical also shows up in places that do not look agricultural at all. Britannica notes that sulfuric acid is used in petroleum refining and metal processing, and hydrometallurgy often uses dilute sulfuric acid to leach metals out of ore. (britannica.com 1) (britannica.com 2) The exception for electronic-grade sulfuric acid is narrow and deliberate. BASF describes semiconductor-grade sulfuric acid as an ultra-pure chemical used in chip manufacturing, and its China plant says wafers go through hundreds of cleaning cycles that use this material. (basf.com 1) (basf.com 2) This move did not arrive by itself. Bloomberg reported in March that China had already tightened fertilizer exports, released fertilizer stockpiles for spring planting, and curbed some fuel exports as the Iran war disrupted raw-material flows and pushed up costs. (bloomberg.com 1) (bloomberg.com 2) (bloomberg.com 3) Beijing also published new supply-chain security rules on April 7 that give the government a broader framework to protect domestic supply and respond to foreign trade pressure. A sulfuric acid cutoff fits that pattern because it targets an upstream input rather than a finished product. (bloomberg.com) The immediate effect is simple: fewer export cargoes of a basic chemical mean tighter supply for buyers that rely on imports. Bloomberg said metals and fertilizer industries were already under strain from raw-material bottlenecks linked to the Iran war before this latest step. (bloomberg.com) The second effect is less visible but more important. When a government starts managing exports of a chemical used to make other chemicals, every downstream buyer has to ask the same question: which input is next, and how much inventory is enough. (bloomberg.com) (usgs.gov) That is why this story is bigger than one acid. It is a sign that China is willing to use control over low-profile industrial feedstocks, while still sparing a strategic niche like semiconductor-grade material where uninterrupted purity matters more than volume. (bloomberg.com) (basf.com)