What is Cs0.33WO3?
Cesium Tungsten Bronze (Cs0.33WO3)
Cesium tungsten bronze (Cs0.33WO3) is screened as a static transparent NIR absorber for solar-control coatings and window-film formulations when electrical conductivity is not the main requirement; qualify the grade in the final film.
Technical owner: Aurexene Materials Engineering Team · Last updated: 2026-07-26
Cs₀.₃₃WO₃CTOcesium tungsten bronzecesium-doped tungsten bronzecesium tungsten oxideCWOtransparent NIR absorbersolar-control coating additivewindow-film NIR absorber
What It Is Not
- Cs0.33WO3 is a cesium tungsten bronze, not tungsten trioxide and not a transparent conductive oxide equivalent to ATO.
- Cs0.33WO3 provides static solar-control absorption; it is not a thermochromic or electrochromic switching layer.
When Not to Use It
- Do not use Cs0.33WO3 when transparent electrical conductivity is the primary function or when blue tint, haze, photothermal heating, or tungsten-bronze chemistry is unacceptable.
Intrinsic Screening Summary
- Identity screen
- Cs0.33WO3; Cesium tungsten bronze oxide particles; grade-specific particle size and agglomerate state require validation.
- Intrinsic feature
- In cesium tungsten bronze, near-infrared absorption is commonly attributed to combined free-carrier localized surface plasmon resonance and polaronic absorption. Their relative contributions depend on composition, defects, particle morphology, and wavelength; this generic mechanism does not establish grade-level spectral performance.
Application Fit
| Application | Suitability | Conditions | Limitations |
|---|---|---|---|
| NIR Shielding Coatings for Transparent Heat Control | GOOD FIT | Use as a transparent solar-control and window-film coating route where near-infrared absorption is required. | Final-film visible transmission, haze, tint, and durability remain application-level qualification gates. |
| Photothermal & Electrothermal Systems | CONDITIONAL | Use conditionally when an external near-infrared source is the heating trigger. | Validate heating rate, temperature uniformity, hot spots, optical appearance, cycling durability, and substrate damage risk in the final system. |
Material Identity & Specification Status
Approved values for CAS / identity are not published; confirm them during quotation or sample review.
| Property | Value |
|---|---|
| Composition | Cs0.33WO3 |
| Particle size | Grade-specific particle-size and agglomerate data are not approved for public publication; request the current grade document and lot evidence. |
| Morphology | Cesium tungsten bronze oxide particles; grade-specific particle size and agglomerate state require validation. |
| Density | Grade-specific true density is confirmed during quotation or sample qualification. |
| Purity | Grade-specific purity and analytical basis are not approved for public publication; request the current grade document and lot COA. |
| Packaging | Grade-specific packaging is not approved for public publication; confirm the supplied form and package during quotation. |
| Storage | Dry sealed container; protect from moisture and contamination before dispersion trials. |
Why It Works
| Structure | Function | Mechanism |
|---|---|---|
| Cesium tungsten bronze (generic CsxWO3 literature context). | Intrinsic explanation for generic near-infrared absorption. | In cesium tungsten bronze, near-infrared absorption is commonly attributed to combined free-carrier localized surface plasmon resonance and polaronic absorption. Their relative contributions depend on composition, defects, particle morphology, and wavelength; this generic mechanism does not establish grade-level spectral performance. |
Material Evidence
Technical Guides
| Technical Guide | Summary |
|---|---|
| Clear NIR barrier coating based on Cs₀.₃₃WO₃ (cesium tungsten bronze) | A formulation and qualification framework for Cesium Tungsten Bronze (Cs0.33WO3) dispersions in transparent NIR-control coatings, with emphasis on aggregate control, optical balance, binder compatibility, and durability. |
| Balancing Film Thickness, Visible Transmission, Solar Modulation, Color, and Durability | Balancing Film Thickness, Visible Transmission, Solar Modulation, Color, and Durability — a method-conditioned engineering guide for Smart Glazing covering structure-function behavior at the material, interface, and finished-system boundary, process limits, validation, and qualification boundaries. |
| Reporting Luminous and Solar Metrics Without Confusing Static and Switching Performance | Reporting Luminous and Solar Metrics Without Confusing Static and Switching Performance — a method-conditioned engineering guide for Smart Glazing covering structure-function behavior at the material, interface, and finished-system boundary, process limits, validation, and qualification boundaries. |
| Wetting and Dispersant Strategy for ATO, Tin Oxide, Tungsten Bronze, Vanadate, and Nitride Particles | Antimony Tin Oxide (ATO), tin oxide, tungsten bronze, vanadate, oxynitride, and nitride surfaces must be screened in the actual carrier and binder; material-family names do not determine wetting, dispersant adsorption, or stability by themselves. |
Documents & Inquiry
Document access follows the current approval state. Unapproved or unavailable files route to a document request instead of a public download.
Technical Data Sheet
Request required
Safety Data Sheet
Request required
Grade, Sample & Qualification Support
The Aurexene Materials Engineering Team can review the required form, host system, formulation or process, target, sample quantity, volume and timeline, and the grade-specific evidence needed before qualification.
Review Lab Capabilities for sample evaluation and qualification support, or Production Capabilities for scale-up, quality, documentation, and supply support.
Request Cs0.33WO3 Sample / Qualification Review