Antimony Pentoxide (ATO) Nanoparticle Synergist

Name: Antimony Pentoxide (ATO) Nanoparticle Synergist
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 1314-60-9

Antimony pentoxide (Sb2O5, ATO) is a halogen synergist available as a colloidal nanoparticle dispersion or micronized powder, used to enhance the effectiveness of brominated and chlorinated flame retardants in transparent films, PET, and textile coatings. Its nanoparticle form allows incorporation without significant hazing in transparent applications where coarser Sb2O3 would impair optical clarity. ATO colloidal dispersions are particularly used in transparent PET film, textile back-coatings, and paper coatings requiring halogen FR synergism.

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Technical Specifications

appearance	White powder or milky white colloidal dispersion
pH (dispersion)	2.0–4.0
Sb2O5 content (%)	≥98 (powder) / 30–40 (dispersion)
moisture (powder, %)	<0.5
particle size D50 (nm)	10–50 (nanograde)
density (dispersion, g/cm³)	1.30–1.50

Applications

Transparent PET and polycarbonate films requiring halogen FR synergism without hazing
Textile back-coating with halogen FR where optical clarity is required
Paper and paperboard fire-retardant coating systems
Waterborne paint and varnish formulations with halogenated FR
Electronic potting and encapsulant compounds requiring transparent FR

Key Features

Nanoparticle size (10–50 nm) maintains optical transparency in films and clear coatings unlike Sb2O3
Colloidal aqueous dispersion form enables direct incorporation into waterborne coating and textile FR systems
Synergistic amplification of brominated and chlorinated FR performance comparable to conventional Sb2O3
Higher antimony oxidation state (+5 vs +3) provides additional oxidant functionality in the flame