High-Whiteness Cristobalite Filler for Engineered Quartz Slab Production
High-whiteness cristobalite filler for engineered quartz slabs, supplied in controlled mesh grades with low moisture and application-focused quality documentation.
Specifications
- SiO2
- ≥99.2–99.6%
- Fe2O3
- ≤0.03–0.08%
- Whiteness
- L* ≥92
- Moisture
- ≤0.10%
- Typical mesh
- 100–1250 mesh
- Specific gravity
- approx. 2.33
Cristobalite Series · Engineered Quartz Slab Raw Material
High-whiteness cristobalite filler for engineered quartz slab matrices, focused on bright background control, filler PSD, resin demand and polish response across white, light-grey, translucent and sparkle surface programs.
Product overview
Our calcined cristobalite flour is intended for slab makers qualifying a bright mineral matrix, where whiteness, phase identity and particle-size distribution affect background color, filler packing, resin wet-out and polish response. It should be evaluated with the customer’s chosen aggregate blend rather than treated as a universal standalone grade.
The right grade depends on the slab design and process. Solid white, light grey, translucent and sparkle series may require different filler mesh, aggregate balance, resin ratio and mixing conditions. The values below are typical reference ranges only; the selected grade and each shipment should be confirmed against the current technical data sheet and batch COA.
Typical specification range
| Property | Typical reference | What to confirm before approval |
|---|---|---|
| SiO₂ content | ≥ 99.2–99.6% | Current grade COA and test method |
| Fe₂O₃ | ≤ 0.03–0.08% | Color-sensitive limit for the customer’s slab series |
| Whiteness | L* ≥ 92 | Measurement method and agreed acceptance value |
| Moisture | ≤ 0.1% | Packing, storage and pre-mixing condition |
| Loss on ignition | ≤ 0.2% | Current grade result |
| Filler particle size | 100–1250 mesh | D10/D50/D90, top cut and sieve residue |
| Specific gravity | Approximately 2.33 g/cm³ | Grade-specific value |
| Mohs hardness | Approximately 6.5 | Application screening requirement |
Specification note: These are industry-typical ranges supplied for grade discussion, not a universal production guarantee. We confirm the actual chemistry, whiteness, moisture and particle-size distribution for the quoted grade by COA.
Grade selection and application fit
- Solid white or light grey: qualify the high-whiteness fine fraction against the incumbent filler and compare background tone, dispersion, pinholes and polish.
- Marble-look designs: combine the fine matrix filler with selected medium aggregate and review background uniformity, vein separation and mineral packing.
- Translucent effects: assess a controlled fine fraction with a compatible aggregate blend, resin wet-out and cured appearance.
- Sparkle or coarse visual texture: use a fine matrix filler with graded coarse particles and inspect segregation and surface exposure.
See the related washed and graded quartz sand aggregates for engineered stone slabs when a coordinated filler-and-aggregate package is required.
Quality control and purchasing checklist
- Send the target slab color, filler mesh or PSD, resin system and current specification or COA.
- Confirm the test method and acceptance limits for chemistry, whiteness, moisture and particle-size distribution.
- Compare the proposed grade with the incumbent filler at the same mineral loading in a controlled lab batch.
- Record mixing, vacuum, curing, finished color, polish quality and reject observations before approval.
- Freeze the approved grade, packing method, COA fields and shipment acceptance limits before repeat orders.
Packaging, MOQ, destination-port terms and document formats are confirmed for the selected grade and shipment plan; generic bag or container quantities should not be treated as fixed commercial terms before quotation.
FAQ
How should high whiteness be evaluated for a quartz slab series?
Compare the same test method, lighting condition and accepted L* range against the incumbent filler, then confirm color, dispersion and polish in a controlled slab trial.
Can a typical whiteness or PSD value be used as a production guarantee?
No. Whiteness and PSD ranges are screening references; the quoted grade and shipment lot must be checked against the applicable COA and the customer’s finished-slab acceptance limits.
Can cristobalite flour be supplied with quartz aggregates?
Yes. A combined mineral package can be discussed when the slab maker wants coordinated filler and aggregate windows, color control and one documentation set.
What information should be included in an RFQ?
Include the slab series, target color, filler mesh or PSD, mineral-to-resin ratio, monthly tonnage, packing preference, destination port and required technical documents.
Request a quote
Use the Request a Quote form with your current specification or COA. We will review the application window before confirming the grade, sample route, documentation and commercial packing.
