What it is
Antimony is a silvery, brittle metalloid used mostly as a flame retardant additive in plastics and textiles, and as an alloying element in lead-acid batteries.
Why it matters
Supply is concentrated in China and Tajikistan. Demand is steady from batteries and defence munitions, and export controls have already tightened.
Circular challenges
Whether antimony re-enters the economy at end-of-life is mostly settled at the design stage. These are the recurring blockers.
Bound into plastics
When antimony is dispersed through a polymer as a flame retardant, it cannot be separated at end-of-life. The plastic burns or is downcycled and the antimony is lost.
Lead-acid recycling works — barely
Closed-loop lead-acid battery recycling does recover antimony, but only if batteries reach formal recyclers. Informal recycling releases it as a contaminant.
No substitute at scale
Halogen-free flame retardants exist but do not yet match performance and cost for the largest applications.