Antimony Trioxide (Sb2O3) Flame Retardant Synergist

Name: Antimony Trioxide (Sb2O3) Flame Retardant Synergist
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 1309-64-4

Featured inFlame Retardants

Antimony trioxide (Sb2O3) is the dominant inorganic synergist used in combination with halogenated flame retardants to dramatically enhance their effectiveness. In the gas phase, it reacts with HBr/HCl from decomposing halogen FRs to form antimony halides and oxyhalides that are highly effective radical chain scavengers. A typical 3:1 (halogen FR : Sb2O3) loading synergistically achieves UL94 V-0 ratings that neither component could reach alone. Sb2O3 is essential in PVC, HIPS, ABS, polyester, and rubber compounds using brominated or chlorinated FRs.

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Technical Specifications

appearance	White fine powder
moisture (%)	<0.2
Sb2O3 content (%)	≥99.5
heavy metals (ppm)	<50
oil absorption (g/100g)	10–25
particle size D50 (µm)	0.3–1.5 (multiple grades)

Applications

Synergist with brominated FRs (TBBPA, deca-BDE, BER) in HIPS, ABS, and nylon compounds
PVC cable and wire insulation with chlorinated FR synergism
Polyester, PBT, and PET compounds using EBTBPI or brominated FR
Rubber and elastomer compounds using halogenated flame retardants
Textile back-coating systems with halogenated FR for furniture and drapery

Key Features

Multiplies effectiveness of halogen FRs: 3:1 (halogen:Sb2O3) synergism reduces total FR loading significantly
Available in ultra-fine grades (D50 < 0.5 µm) for minimal impact on surface gloss and optical properties
Surface-treated grades with stearic acid or silane available for improved dispersion in polymers
Widely approved in global FR standards and UL certifications for use with brominated and chlorinated systems