Horticultural Vermiculite from China - Quality Supplier & Factory for Seed Starting and Potting Mixes

Horticultural vermiculite is a premium lightweight expanded mineral material sourced from natural vermiculite flakes through a high-temperature exfoliation process. This transformation involves turning moisture trapped within the mineral's layered structure into steam, resulting in the expansion of vermiculite into accordion-like granules. The final product is characterized by its lightweight, porous, soft, and clean nature, making it an ideal choice for retaining water and nutrients while providing necessary air space in growing media. As a result of its exceptional water retention, aeration, and cation exchange properties, horticultural vermiculite is extensively utilized in various applications, including seed starting, plant propagation, potting soil, greenhouse cultivation, hydroponic growing media, nursery production, vegetable seedlings, flower cultivation, lawn repair, and soil conditioning. It is especially beneficial for young roots that require stable moisture levels and gentle mineral support. WANCHENG MINERAL, a leading China supplier and factory of horticultural vermiculite, offers a variety of particle sizes and bulk density levels tailored to meet customer demands. Our common grades include fine, medium, and coarse particles. Fine vermiculite is ideal for seed germination and covering, while medium vermiculite is perfect for potting mixes and propagation media. Coarse vermiculite is designed for professional growing media applications where aeration and structural integrity are crucial. For growers, soil producers, distributors, greenhouse farms, and agricultural suppliers, consistent quality is paramount. Variations in particle size, excessive dust, high moisture content, or unstable expansion may hinder handling, mixing, and water-holding performance, ultimately affecting growth results. At WANCHENG MINERAL, we emphasize rigorous raw material selection, controlled expansion processes, precise grading, comprehensive quality inspections, and export packaging to ensure our customers receive reliable horticultural vermiculite products.

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Product Details

Chemical Specifications

Chemical Component	Typical Content	Description
SiO₂	35% - 45%	Main silicate component
MgO	15% - 25%	Typical vermiculite component
Al₂O₃	8% - 15%	Aluminosilicate component
Fe₂O₃	5% - 12%	Affects color and mineral characteristics
K₂O	3% - 8%	Interlayer potassium component
CaO	1% - 4%	Minor component
TiO₂	Trace - 2%	Controlled impurity
Loss on Ignition	Low after expansion	Depends on expansion process

Frequently Asked Questions

What is the primary chemical element in vermiculite?

The primary component is Silicon Dioxide (SiO₂), which accounts for 35% to 45% of the total composition, forming the core silicate structure.

Why is the presence of MgO significant in vermiculite?

Magnesium Oxide (MgO) makes up 15% to 25% of the material, serving as a defining characteristic that contributes to vermiculite's thermal stability and cation exchange capacity.

How does Fe₂O₃ influence the properties of the mineral?

Iron Oxide (Fe₂O₃), ranging from 5% to 12%, directly influences the visual coloration (golden-brown/bronze) and subtle mineralogical behavior during exfoliation.

What does "Loss on Ignition" (LOI) indicate?

Loss on Ignition indicates the release of interlayer water and volatile substances during thermal expansion. After proper industrial expansion, this value remains consistently low.

Are trace minerals like TiO₂ strictly controlled?

Yes, Titanium Dioxide (TiO₂) is kept between trace levels and 2% as a controlled natural impurity to ensure high chemical purity and consistent industrial performance.

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