China Horticultural Vermiculite - Quality Suppliers & Factory-Direct Lightweight Growing Media
| Chemical Component | Typical Content | Description |
|---|---|---|
| SiO2 (Silicon Dioxide) | 35% - 45% | Main silicate component |
| MgO (Magnesium Oxide) | 15% - 25% | Typical vermiculite component |
| Al2O3 (Aluminum Oxide) | 8% - 15% | Aluminosilicate component |
| Fe2O3 (Iron Oxide) | 5% - 12% | Affects color and mineral characteristics |
| K2O (Potassium Oxide) | 3% - 8% | Interlayer potassium component |
| CaO (Calcium Oxide) | 1% - 4% | Minor component |
| TiO2 (Titanium Dioxide) | Trace - 2% | Controlled impurity |
| Loss on Ignition | Low after expansion | Depends on expansion process |
The major components are Silicon Dioxide (SiO2) at 35% - 45% and Magnesium Oxide (MgO) at 15% - 25%, forming the core hydrated laminar magnesium-aluminum-iron silicate mineral structure.
Iron Oxide (Fe2O3) directly influences the mineral's natural coloration (ranging from golden brown to bronze) and contributes to its specific physical and thermal characteristics.
Loss on Ignition refers to the moisture and volatile content driven off during high-temperature exfoliation. For fully expanded vermiculite, LOI remains very low because interlayer water has already been released.
Yes. Because vermiculite is chemically inert, non-combustible, and non-reactive, its natural silicate and oxide composition makes it highly suitable for soil conditioning, fireproofing, and insulation.
Minor variations can occur naturally based on the geological deposit and mining source; however, the typical composition ranges remain strictly monitored within commercial quality standards.
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