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Expanded Vermiculite from China - Lightweight Insulation Material by Leading Suppliers and Factory

Expanded vermiculite is a lightweight mineral material produced by heating high-quality raw vermiculite ore at elevated temperatures. During this expansion process, the moisture within the vermiculite is rapidly converted into steam, resulting in the transformation of mineral flakes into accordion-like particles characterized by low bulk density, high porosity, and excellent thermal insulation properties. The final product is a non-metallic, chemically stable material that easily integrates with various other substances.

Due to its unique structural properties, expanded vermiculite is widely utilized across multiple sectors, including horticulture, agriculture, thermal insulation, fire-resistant materials, lightweight concrete, dry mortar, refractory mixes, packaging, animal bedding, soil enhancement, seed germination, and industrial filler applications. In horticultural systems, it effectively retains water and nutrients while enhancing aeration and soil structure. In construction and insulation, it significantly reduces weight, improves thermal performance, and bolsters fire resistance.

WANCHENG MINERAL, a leading supplier in China, offers expanded vermiculite in various particle sizes and grades tailored to meet customer needs. Our common grades include fine, medium, coarse, and super coarse particles. This product caters to professional growers, potting soil manufacturers, construction material factories, fireproof board manufacturers, refractory producers, insulation contractors, distributors, and industrial users. Additionally, we provide bulk supply, export packaging, sample support, and customized particle size solutions from our state-of-the-art factory.

For international buyers, selecting the right grade of expanded vermiculite is crucial. Horticultural applications emphasize clean particles, optimal water retention, proper aeration, and suitable size distribution, while construction and insulation applications demand lightweight density, stable thermal behavior, and consistent particle sizing. Refractory applications may necessitate materials with superior temperature stability and specific chemical compositions. At WANCHENG MINERAL, we assist customers in identifying the most suitable grades based on their specific applications and market requirements.

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    Chemical Composition & Specifications

    Chemical Component Typical Content Description
    SiO2 35% - 45% Main silicate component
    MgO 20% - 30% Typical vermiculite component
    Al2O3 8% - 16% Alumina component
    Fe2O3 5% - 12% Affects color and mineral characteristics
    K2O 3% - 8% Interlayer alkali component
    CaO 1% - 5% Minor component
    TiO2 0.5% - 2% Trace component
    Loss on Ignition Varies by grade Related to water and expansion behavior

    Frequently Asked Questions

    What are the primary chemical components of this material?

    The primary constituents are Silicon Dioxide (SiO2) at 35%–45% and Magnesium Oxide (MgO) at 20%–30%, forming the core silicate structure typical of magnesium-aluminum-iron phyllosilicates.

    How does Fe2O3 content influence the material's properties?

    Iron oxide (Fe2O3), ranging between 5% and 12%, directly influences the natural color, golden-brown tint, and mineral stability across various thermal and industrial applications.

    What does "Loss on Ignition" signify for this compound?

    Loss on Ignition indicates the percentage of moisture and interlayer bound water released at elevated temperatures, which directly dictates the exfoliation and volumetric expansion ratio.

    Why are K2O and CaO present in the chemical profile?

    Potassium oxide (K2O) and Calcium oxide (CaO) act as interlayer alkali and minor components, contributing to the balance of electrostatic charges within the mineral's layered crystalline matrix.

    Does the chemical composition remain consistent across all grades?

    While the relative proportions of major oxides like SiO2 and MgO stay within stated standard tolerances, minor variations in trace elements and Loss on Ignition can occur depending on specific mineral grade and origin.

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    FAQ

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