Silica-Coated Zinc Oxide Powder (SiO2@ZnO)
SiO2@ZnO powder encapsulates photoactive zinc oxide in a silica shell, retaining ZnO's UV-blocking and antibacterial character while suppressing the photocatalytic reactivity that can degrade cosmetic and coating formulations.
Ultra-thin shellCoating Content
80-100 nmParticle Size Range
Custom Made-to-OrderGrade, Size & Quantity
WorldwideExport Shipping
Silica-Coated Zinc Oxide Powder — Grades & Specifications
Silica-Coated Zinc Oxide Powder (SiO2@ZnO) powder is supplied across a range of grades, particle sizes and coating ratios. The options below are typical; specify your target values in the request form and we will confirm availability, lead time and pricing.
| Material | Silica-Coated Zinc Oxide Powder (SiO2@ZnO) |
|---|---|
| Category | Ceramic/Oxide-Coated Powder |
| Core material | Zinc oxide (CAS 1314-13-2) |
| Coating / shell material | Silicon dioxide (silica) (CAS 7631-86-9) |
| Coating content | Academic synthesis reports ultra-thin shells (around 1 nm) on small ZnO cores; commercial nanopowder grade is offered without a separately quoted shell wt% |
| Particle size | Approximately 80-100 nm APS, customizable; smaller research-grade variants also reported |
| Morphology | Spherical |
| Appearance | White powder |
| Photocatalytic Suppression | The dense silica coating strongly suppresses ZnO's photocatalytic activity and gives near-complete resistance to further particle growth under prolonged heating, which is important where uncoated ZnO would otherwise degrade organic formulation components |
| Typical applications | Mineral Sunscreens & Cosmetic UV Filters, UV-Stabilized Polymer Composites, Antimicrobial Coatings, Photocatalysis-Controlled Pigments |
Applications by Industry
Mineral Sunscreens & Cosmetic UV FiltersPhotostable UV-blocking pigment without excess free-radical skin irritation.
UV-Stabilized Polymer CompositesAnti-UV-aging filler for transparent plastics and films.
Antimicrobial CoatingsRetains ZnO's antibacterial core function while silica limits reactivity with the matrix.
Photocatalysis-Controlled PigmentsWhite pigment for paints where uncoated ZnO's photoactivity would cause binder breakdown.
Biomedical & Biosensing CarriersCore-shell nanoparticle platform used in drug delivery and biosensing research.
Rubber & Coatings AdditiveDispersible ZnO source for vulcanization and coatings needing reduced photoreactivity.
Particle Size & Mesh Conversion
Reference for converting between US mesh and microns/millimetres. Figures are nominal sieve openings and may vary slightly by standard.
| Mesh (US) | Micron (µm) | mm | Inch | Remarks |
|---|---|---|---|---|
| 3 | 6730 | 6.730 | 0.2650 | |
| 4 | 4760 | 4.760 | 0.1870 | |
| 5 | 4000 | 4.000 | 0.1570 | |
| 6 | 3360 | 3.360 | 0.1320 | |
| 7 | 2830 | 2.830 | 0.1110 | |
| 8 | 2380 | 2.380 | 0.0937 | |
| 10 | 2000 | 2.000 | 0.0787 | |
| 12 | 1680 | 1.680 | 0.0661 | |
| 14 | 1410 | 1.410 | 0.0555 | |
| 16 | 1190 | 1.190 | 0.0469 | |
| 18 | 1000 | 1.000 | 0.0394 | |
| 20 | 841 | 0.841 | 0.0331 | |
| 25 | 707 | 0.707 | 0.0278 | |
| 30 | 595 | 0.595 | 0.0234 | |
| 35 | 500 | 0.500 | 0.0197 | |
| 40 | 420 | 0.420 | 0.0165 | |
| 45 | 354 | 0.354 | 0.0138 | |
| 50 | 297 | 0.297 | 0.0117 | |
| 60 | 250 | 0.250 | 0.0098 | |
| 70 | 210 | 0.210 | 0.0083 | |
| 80 | 177 | 0.177 | 0.0070 | |
| 100 | 149 | 0.149 | 0.0059 | |
| 120 | 125 | 0.125 | 0.0049 | |
| 140 | 105 | 0.105 | 0.0041 | |
| — | 100 | 0.100 | 0.0039 | Sand |
| 170 | 88 | 0.088 | 0.0035 | |
| 200 | 74 | 0.074 | 0.0029 | |
| — | 70 | 0.070 | 0.0027 | |
| 230 | 63 | 0.063 | 0.0024 | Human hair |
| — | 55 | 0.055 | 0.00217 | |
| 270 | 53 | 0.053 | 0.0021 | |
| — | 50 | 0.050 | 0.00197 | |
| 325 | 44 | 0.044 | 0.0017 | |
| — | 40 | 0.040 | 0.00157 | |
| 400 | 37 | 0.037 | 0.0015 | |
| 550 | 25 | 0.025 | 0.00099 | |
| 625 | 20 | 0.020 | 0.00079 | |
| 1200 | 12 | 0.012 | 0.0005 | |
| 1250 | 10 | 0.010 | 0.000394 | |
| — | 7 | 0.007 | 0.000276 | |
| 2500 | 5 | 0.005 | 0.000197 | |
| 4800 | 3 | 0.003 | 0.000118 | |
| 5000 | 2.5 | 0.0025 | 0.000099 | Bacteria (approx.) |
| 12000 | 1 | 0.001 | 0.0000394 |
Information Required for Quotation
- Grade or type
- Particle size (micron or mesh)
- Coating content / core-shell ratio
- Quantity
- Application environment
- Required delivery country
Lead time depends on grade, particle size, quantity and processing requirements. Export availability can be reviewed based on destination country and material type. A Certificate of Analysis can be provided on request.
Request a Quote or Custom Order
Tell us your grade, particle size and quantity. We typically reply within one business day.
Frequently Asked Questions
What is the coating content of Silica-Coated Zinc Oxide Powder?
Academic synthesis reports ultra-thin shells (around 1 nm) on small ZnO cores; commercial nanopowder grade is offered without a separately quoted shell wt% Other coating ratios can be reviewed on request depending on your application and quantity.
What particle sizes can you supply?
Approximately 80-100 nm APS, customizable; smaller research-grade variants also reported Mesh-based requirements are also accepted; a mesh-to-micron conversion reference is provided on the page.
Can Silica-Coated Zinc Oxide Powder be made to custom specifications?
Yes. Silica-Coated Zinc Oxide Powder is produced to order — core/shell ratio, particle size, morphology and packaging can be customized to your specification. Select “Custom Order” in the request form and provide your target values.
What is the minimum order quantity (MOQ)?
Order quantity is flexible and small quantities and prototype requests are welcome. Please state your required quantity in the form for an accurate quotation.
Can you export and ship Silica-Coated Zinc Oxide Powder internationally?
Yes, export inquiries are welcome. Availability and shipping are reviewed based on destination country, grade and quantity.
Do you provide a Certificate of Analysis (COA) or technical data?
A Certificate of Analysis and technical data can be provided on request for supplied lots.
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Request a Quote for Silica-Coated Zinc Oxide Powder
Send us your grade, particle size, quantity and application. We will review availability, quotation and lead time. Small quantities, prototypes and custom made-to-order specifications are welcome.