High-Whiteness Cristobalite Powder for Cool-Roof Coatings
High-whiteness cristobalite powder for cool-roof and reflective architectural coating trials. M3000/M4000/M6000 reference grades provide D50 options of 12/5/3 μm; confirm dispersion, solar reflectance, thermal emittance, SRI and weathered retention in the finished coating.
Specifications
- Mesh Size
- 200mesh,325mesh,M400,M600,M3000,M4000,M6000
- Particle Size
- 3-5mm,1-3mm,1-0.5mm,0.5-0.2mm,0.1-0.2mm,0.1-0mm(120mesh),0.075mm(200mesh)
- SiO₂ Content
- 99.3-99.7%
- Fe₂O₃
- <0.015%
- Specific Gravity
- 2.30 g/cm³
- Whiteness
- 90-98
- Moh's hardness
- 6.5
- Conversion-related parameter
- 80-95%
HIGH-WHITENESS CRISTOBALITE FOR REFLECTIVE COATINGS
Controlled-size reference grades for cool-roof and light-coloured architectural coating trials.
Product Overview
Changtong M3000, M4000 and M6000 reference grades provide D50 options of 12, 5 and 3 μm for screening packing, film build and surface appearance in cool-roof coatings. Supplier reference chemistry lists SiO₂ 99.5%, Fe₂O₃ 0.03% and density 2.35 g/cm³.
These are grade references, not universal guarantees. Confirm current TDS/COA, binder compatibility, PVC/CPVC, film thickness, substrate and the project’s reflectance and weathering methods.
Material Identity and Grade Information
Grade-specific information — confirm the selected grade and test values before production use.
Material
Processed cristobalite in the crystalline silica category.
Reference grades
M3000 / M4000 / M6000 for D50 comparison.
Use case
Reflective roof and light-coloured architectural coating trials.
Properties and Specification
| Reference grade | D50 | Screening role | Project control |
|---|---|---|---|
| M3000 | 12 μm | Coarser packing and texture comparison | Confirm settling and film build |
| M4000 | 5 μm | Balanced dispersion and film-build trial | Confirm viscosity and hiding |
| M6000 | 3 μm | Fine-particle surface and appearance trial | Confirm dispersion and weathered retention |
| Chemistry | SiO₂ 99.5%; Fe₂O₃ 0.03% | Supplier reference | Confirm current COA and agreed limits |
| Density | 2.35 g/cm³ | Supplier reference | Confirm method and lot value |
Reference context: Reflectance, emittance and SRI are finished-coating results. Industry guidance is reference material only, not Changtong measured data or a certification.
Applications for High-Whiteness Cristobalite
Reflective Roof Coatings
Measure initial and aged solar reflectance, thermal emittance and calculated SRI at target dry-film thickness.
Architectural Finishes
Screen packing, hiding, colour, scrub resistance and adhesion with fixed binder and pigment.
Weather-Exposed Films
Retain panels for UV, water, dirt-pickup and outdoor-weathering review.
A Practical Grade-Selection Workflow
- Define the visual target. Record colour, gloss, substrate, dry-film thickness and lighting condition.
- Match D50 to the film. Compare M3000, M4000 and M6000 with fixed binder, pigment and dosage.
- Measure the finished film. Test reflectance, emittance, SRI, settling, adhesion and scrub resistance.
- Approve a retained panel. Freeze the grade, weathering method, acceptance limits and lot COA.
Production, Inspection and Quality Documents
Record pigment and binder lot, dispersion sequence, dosage, drawdown, cure, dry-film thickness and exposure condition. Request the applicable TDS and batch COA; keep an approved panel for future colour and reflectance comparison.
Related Changtong Products
For high-voltage insulation, review M4000 cristobalite for EV silicone cable compounds. For category browsing, see Cristobalite Series.
Request a Quote for Cool-Roof Cristobalite
Share coating chemistry, target D50, colour, PVC, application method, dry-film thickness, reflectance/SRI method, weathering test, country, Phone/WhatsApp and annual quantity.
Request a QuoteFAQ
Does high whiteness guarantee a high SRI?
No. SRI depends on the complete coating’s solar reflectance and thermal emittance after cure.
Which grade should be screened first?
M4000 is a balanced starting point; compare M3000 and M6000 against film build, viscosity and hiding requirements.
What should be included in an RFQ?
Specify binder and pigment package, target D50, PVC, film thickness, substrate, reflectance method, weathering test, packing, country, Phone/WhatsApp and annual quantity.
