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Window film technology

Antimony Tin Oxide (ATO)

Antimony tin oxide (ATO) is a transparent conductive oxide nano-particle used in some window films for selective infrared rejection, particularly in the longer near-infrared wavelengths.

ATO nano-particles target near-infrared wavelengths above 1200 nm, complementing CWO's 800–1500 nm focus. Some premium ceramic films use both ATO and CWO together for broader IR coverage.

ATO is non-metallic and signal-friendly. It is also more thermally stable than some alternative IR-rejecting compounds, which extends film life under tropical conditions.

For Singapore drivers, ATO contributes to the cumulative heat rejection on premium nano-ceramic films. Most spec sheets don't break out individual nano-particle chemistries; total solar energy rejection and IRR are the summary metrics that matter.