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Antimony Pentoxide
High-Efficiency Inorganic Flame-Retardant Synergist & Colloidal Specialty
Antimony Pentoxide (Sb₂O₅, CAS 1314-60-9) is a powerful inorganic flame-retardant synergist that delivers significant performance gains when combined with halogenated flame retardants. Available as a powder or as colloidal Sb₂O₅ for transparent and fine-fiber applications, our product is used worldwide in plastics, textiles, copper-clad laminates and optical glass.
Product Overview
Antimony Pentoxide is typically supplied as the hydrate Sb₂O₅·nH₂O, with appearance ranging from white cubic crystals to pale yellow powder. Above 380 ℃ it loses one oxygen to form Sb₂O₄; above 930 ℃ it converts to Sb₂O₃. This controlled thermal behaviour underpins its flame-retardant synergy with halogen-based systems.
Key Features
- High-efficiency synergist with halogenated flame retardants — reduces overall FR loading
- Available in both powder and colloidal forms
- Colloidal Sb₂O₅ (~5 nm particles) preserves substrate transparency
- Superior heat stability and dispersion in polymers
- Compatible with PVC, polyolefins, ABS, polyester and rubber systems
- Used as a fining and anti-devitrification aid in optical glass
Applications
Polymer Flame Retardancy
Synergist with Cl/Br flame retardants in plastics, textiles, paper, rubber, copper-clad laminates.
Textile Finishing
Colloidal grade for wash-fast, colour-neutral flame-retardant finishes on high-performance textiles.
Transparent FR Plastics
Colloidal Sb₂O₅ preserves transparency in PMMA, PC and specialty engineering plastics.
Optical Glass Fining
Bubble suppression and anti-devitrification in optical glass melting; precursor for antimonate salts.
Polymer Flame Retardancy
Synergist with Cl/Br flame retardants in plastics, textiles, paper, rubber, copper-clad laminates.
Textile Finishing
Colloidal grade for wash-fast, colour-neutral flame-retardant finishes on high-performance textiles.
Transparent FR Plastics
Colloidal Sb₂O₅ preserves transparency in PMMA, PC and specialty engineering plastics.
Optical Glass Fining
Bubble suppression and anti-devitrification in optical glass melting; precursor for antimonate salts.
Packaging specifications
Powder grade: Vacuum-sealed aluminium-plastic composite bags, 25 kg per bag. Colloidal grade: HDPE drum, 200 kg or per spec. Store sealed in a cool, dry environment; keep away from alkalis and ammonium sulfide.
Parameter indicators
| Category | Index Details | Value 1 | Value 2 |
|---|---|---|---|
| Chemical Components (%) | Sb₂O₃ ≤ | 99.80 | 99.80 |
| Impurity content ≤ | |||
| As | 0.0100 | 0.0450 | |
| Pb | 0.0100 | 0.0740 | |
| Fe | 0.0035 | 0.0035 | |
| Cu | 0.0020 | 0.0020 | |
| Se | 0.0040 | 0.0040 | |
| Bi | 0.0020 | 0.0020 | |
| Cd | 0.0041 | 0.0010 | |
| Physical Property | Average radius /μm ≤ | 1 | 1 |
| White sheen ≤ | 96 | 95 |
FAQs for Antimony Pentoxide
Does Antimony Pentoxide work as a flame retardant by itself?
No. Sb₂O₅ alone is not an effective flame retardant for most polymers. Its value comes from synergy with chlorinated or brominated flame retardants — together they reduce overall FR loading by 30–50% while maintaining or improving UL-94 ratings.
What is colloidal Antimony Pentoxide and when do I need it?
Colloidal Sb₂O₅ has primary particle sizes around 5 nm — much finer than powder grade. It is required when transparency matters (transparent plastics), when wash-fastness matters (textile FR finishes), or when ultra-fine PP fibers need uniform FR distribution.
How does Sb₂O₅ compare with Sb₂O₃ as a flame-retardant synergist?
Sb₂O₅ has higher oxidation state and is more efficient per unit of antimony in some halogenated systems. Sb₂O₃ remains the volume product for general-purpose use. We supply both — let our team know your polymer matrix and halogen system and we will recommend the optimal grade.
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