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. |
Selection & Validation Framework
| Decision Question | Material-Level Answer |
|---|---|
| Transparent plastic laser welding | Required for: LASER Curable Systems. Measure: UV-vis-NIR transmission and haze before welding; interface temperature under target laser settings; weld strength and failure mode; visible color or tint after welding; polymer burn, bubble, or distortion check. Sample state: final polymer layer, interface coating, or absorber-loaded part. Failure signals: agglomerate specks or haze; weak weld strength; overheating or polymer burning; unacceptable yellow, blue, or gray tint; poor repeatability across laser settings. |
| Optical heat-management film | Required for: IR Shielding Coatings and Photothermal / Electrothermal Systems. Measure: visible transmission; haze; color coordinates; NIR attenuation from approved test data; coating adhesion and durability; humidity and thermal aging. Sample state: final coating, film, laminate, or optical part. Failure signals: high haze; excessive tint; weak NIR rejection; coating instability; cost or loading above the project ceiling. |
Material Identity & Specification Status
Approved values for CAS / identity and Packaging 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. |
| 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. |
Commercial Availability
Supplier role: Request confirmation
Supply status: Request confirmation
Sample status: Sample availability requires confirmation
Commercial details are not published until the source and verification fields are complete and the Supplier Data Packet is signed by the sales owner, technical reviewer, and resource/compliance owner. Request current grade, form, sample, packaging, and delivery confirmation.
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