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Vermiculite Flakes from China - Quality Suppliers and Factory for Unexpanded Vermiculite Products
Chemical Composition Specification
| Chemical Component | Typical Content | Description |
|---|---|---|
| SiO2 | 35% - 45% | Main silicate component |
| MgO | 18% - 25% | Typical magnesium component |
| Al2O3 | 8% - 15% | Alumina component |
| Fe2O3 | 5% - 12% | Affects color and mineral grade |
| K2O | 2% - 6% | Typical layered silicate component |
| CaO | 0.5% - 3% | Minor component |
| TiO2 | ≤ 2% | Controlled impurity |
| Loss on Ignition | 4% - 12% | Related to structural water |
Frequently Asked Questions
What is the role of SiO2 in this chemical composition?
SiO2 (Silicon Dioxide) accounts for 35% - 45% of the total composition and serves as the primary silicate backbone, ensuring fundamental structural stability and thermal durability.
How does the Fe2O3 content influence product grade and appearance?
Fe2O3 (Iron Oxide) content ranges between 5% and 12%, directly dictating the mineral's coloration, tint depth, and overall commercial classification grading.
What does "Loss on Ignition" (LOI) signify in this specification?
A Loss on Ignition value of 4% - 12% measures the release of structural water, volatile matter, and interlayer moisture when subjected to high-temperature testing.
Why is the presence of MgO critical in layered silicates?
With a proportion of 18% - 25%, MgO (Magnesium Oxide) contributes significantly to thermal insulation properties, chemical inertia, and mechanical resilience.
Are TiO2 and CaO levels strictly controlled?
Yes, TiO2 is held at ≤ 2% as a controlled impurity, while CaO remains between 0.5% and 3% to maintain chemical purity and batch consistency.
What function does Al2O3 provide within this mineral matrix?
Al2O3 (Alumina) present at 8% - 15% enhances refractory performance, hardness, and wear resistance within the silicate structure.
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