Antimony Trioxide

Terracore Chemicals is a reliable antimony trioxide supplier serving compounders, cable manufacturers, and coatings producers across Sub-Saharan Africa and international markets. Antimony trioxide (Sb₂O₃, CAS 1309-64-4) is an inorganic compound used primarily as a synergist to amplify the flame retardant performance of halogenated additives in polymer systems. It is one of the most commercially important flame retardant materials in the PVC, rubber, and engineering plastics industries.

How Antimony Trioxide Works as a Synergist

Antimony trioxide does not act as a standalone flame retardant. When combined with halogenated compounds — such as decabromodiphenyl ether, chlorinated paraffins, or the halogens already present in PVC — it forms antimony trihalides (SbCl₃, SbBr₃) in the gas phase during combustion. These species interrupt the free-radical chain reactions that sustain the flame, producing a powerful synergistic effect.

Typical loading ratios in flame retardant formulations range from 1:2 to 1:3 (Sb₂O₃ to halogen source by weight). Working with a consistent antimony trioxide supplier is critical to maintaining stable flame test results across production batches, since variation in particle size or purity directly affects synergist efficiency and LOI values.

Technical Specifications

Standard antimony trioxide from Terracore Chemicals: CAS 1309-64-4; molecular weight 291.52 g/mol; purity (Sb₂O₃) ≥99.5%; antimony content (Sb) ≥83.5%; arsenic (As) ≤0.05%; lead (Pb) ≤0.05%; median particle size (d50) 1.0–2.0 µm. Ultra-fine grades are available on request for high-performance formulations.

Sourcing & Supply

As a direct antimony trioxide supplier, Terracore Chemicals packages Sb₂O₃ in 25 kg lined kraft bags and 500 kg super-sacks for bulk orders. Our Northern Cape facility provides direct access to South African container export ports serving Europe, Asia, and the Americas. Full material documentation — including SDS, TDS, and certificate of analysis — is issued with every shipment.

Contact our technical team to discuss your formulation requirements and minimum order quantities. Terracore Chemicals is your antimony trioxide supplier for both developmental trials and full production volumes, with lead times confirmed at quotation stage.

Storage and Handling

Antimony trioxide should be stored in a cool, dry, well-ventilated warehouse away from strong acids, alkalis, and reducing agents. Standard industrial dust control measures apply: HEPA-filtered dust extraction, PPE including P3 respirators, and avoidance of ingestion or inhalation are required in accordance with occupational exposure limits.