Antimony is a brittle, silvery-white metalloid classified as a critical mineral by the US, EU, and UK — and since September 2024, subject to Chinese export licensing controls that have disrupted supply to Western electronics manufacturers, defence contractors, and battery producers. What is antimony, and why has it moved from industrial background material to geopolitical flashpoint? This page covers the properties, applications, supply chain, and market risk profile that procurement and investment professionals need to know.
What Is Antimony? Properties and Characteristics
Antimony (symbol: Sb, from the Latin stibium) is a metalloid with atomic number 51. It sits between metals and non-metals in behaviour — brittle and poorly conductive as a pure element, but chemically versatile in compound form. Its melting point is 630.6°C. In its most commercially significant form, antimony trioxide (Sb₂O₃), it functions as a flame retardant synergist at industrial scale.
The primary ore mineral is stibnite (antimony trisulfide, Sb₂S₃), from which antimony metal and trioxide are refined. Antimony is not consumed in large volumes — global mine production runs at roughly 80,000–100,000 tonnes per year — but its applications are strategically concentrated in sectors where substitution is technically difficult and commercially costly.
What Is Antimony Used For?
Flame retardants account for the largest share of antimony consumption — estimated at 70–80% of demand in developed markets, based on USGS data. Antimony trioxide is used as a synergist with halogenated compounds in electronics casings, textiles, and plastics. It does not act as a flame retardant alone; it amplifies the performance of brominated and chlorinated co-agents, which means it cannot be removed from formulations without a full system reformulation.
Lead-acid batteries represent the second significant end-use. Antimony hardens lead grid structures, improving battery cycle life in automotive and stationary grid storage applications. Although antimony-free lead-acid chemistries exist, antimony-hardened grids remain preferred in deep-cycle and industrial battery applications.
Ammunition and military applications include antimony compounds in primer compositions and tracer projectiles. Defence procurement agencies in the US and Europe have identified antimony as a supply chain vulnerability given its concentration in Chinese production.
Photovoltaics represent an emerging application: antimony selenide (Sb₂Se₃) is under development as a thin-film solar cell absorber material. It is early-stage commercially, but has attracted research interest as a cadmium-free alternative in certain thin-film architectures. Semiconductors use small but strategically notable volumes — indium antimonide (InSb) appears in infrared detectors and certain high-speed transistor applications.
Where Is Antimony Produced?
China dominates global antimony mine production. USGS Mineral Commodity Summaries place China’s share at approximately 48–55% of global mine output, with production concentrated in Hunan and Guangxi provinces. Chinese smelting and refining capacity is even more dominant — the majority of global antimony trioxide is processed in China regardless of ore origin.
Outside China, significant producers include Russia, Tajikistan, and Bolivia. Australia holds identified deposits but has limited active production. There is no significant European antimony producer. This geographic concentration means Western buyers have few credible alternative supply options in the near term. For broader context on supply chain exposure across technology metals, see technology metals at risk from China export controls.
Antimony Price and Market
Antimony prices surged through 2024 and into 2025, driven by tightening Chinese export policy and growing demand from Western buyers seeking to build inventory ahead of further controls. The current antimony price — covering spot rates for antimony trioxide and antimony metal — is tracked and updated monthly on this site. Price volatility has been pronounced since mid-2024, with buyers relying on just-in-time procurement facing delivery delays and significant cost increases.
Antimony Supply Chain Risks and China Export Controls
In August 2024, China’s Ministry of Commerce (MOFCOM) announced that antimony and related compounds would be added to its export control list. Controls came into force in September 2024, requiring Chinese exporters to obtain government licences before shipping antimony metal, antimony trioxide, and antimony ore products to foreign buyers.
The practical effect on Western buyers was immediate. Electronics manufacturers sourcing antimony trioxide for flame retardant applications, defence contractors using antimony in ammunition primer compounds, and battery producers relying on antimony-hardened lead grids all faced supply chain disruption. Licence approval timelines were opaque in the initial months, and several European importers reported shipment delays of four to eight weeks.
US and European defence agencies have since flagged antimony as a critical material requiring strategic stockpile assessment. The IEA Critical Minerals Policy Tracker identifies antimony among materials where supply concentration poses strategic risk to Western industrial and defence sectors.
Western substitution options remain limited in the near term. No large-scale antimony trioxide production exists outside China and Russia. Antimony selenide solar cell technology remains early-stage. The most realistic response for Western buyers is inventory building, supply diversification where Tajik or Bolivian sources allow, and reformulation programmes — all of which take years, not months. For further context on Asian critical minerals supply chains and the policy environment shaping Western procurement, see CMN’s Asia location hub.
This article is for informational purposes only and does not constitute investment advice.
What is antimony used for?
Antimony’s largest application is flame retardants — antimony trioxide is used as a synergist with halogenated compounds in electronics, plastics, and textiles, accounting for an estimated 70–80% of consumption in developed markets. Other significant uses include lead-acid battery hardening, ammunition primer compounds, and tracer projectiles. Antimony selenide is an emerging material in thin-film solar cell research.
Why is antimony a critical mineral?
Antimony is classified as critical by the US, EU, and UK because of its high supply concentration — China accounts for approximately 48–55% of global mine production and dominates global refining — combined with limited near-term substitution options in its key applications. Its use in defence, electronics, and battery manufacturing makes supply security a national security consideration.
What are China’s antimony export controls?
In August 2024, China’s MOFCOM announced export controls on antimony metal, antimony trioxide, and related compounds, which took effect in September 2024. Chinese exporters must obtain government licences before shipping. Western buyers in electronics, defence, and battery sectors reported supply delays and price increases following implementation. The controls are part of a broader pattern of Chinese restrictions on strategic materials.
What is the current antimony price?
Antimony prices rose sharply following China’s 2024 export control announcements and remain elevated relative to pre-2024 levels. Current spot prices for antimony trioxide and antimony metal are tracked and updated monthly on the CMN antimony price page at /antimony-price/.
Who produces antimony outside China?
Significant producers outside China include Russia, Tajikistan, and Bolivia. Australia holds identified deposits but has limited active production. There is no major European antimony producer. Tajik and Bolivian supply exists but is insufficient to replace Chinese volumes at current Western demand levels.
What are antimony’s key properties?
Antimony (symbol Sb, atomic number 51) is a metalloid — displaying properties of both metals and non-metals. It is brittle, silvery-white, and melts at 630.6°C. Its most commercially important characteristic is its flame retardant synergism in compound form: antimony trioxide (Sb₂O₃) amplifies the performance of halogenated flame retardants in electronics and textiles.
