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Vermiculite Flakes from China - Quality Suppliers and Factory for Unexpanded Vermiculite Products

Vermiculite flakes, known as unexpanded vermiculite or raw vermiculite concentrate, are naturally occurring layered mineral particles derived from carefully selected vermiculite ore. In their unexpanded state, these flakes exhibit a range of colors including golden brown, bronze, yellowish, or dark brown, characterized by a mica-like layered structure. When subjected to high temperatures, the internal water molecules rapidly vaporize, resulting in lightweight and porous expanded vermiculite. This unique mineral, a hydrated magnesium-aluminum silicate, boasts exceptional thermal expansion properties, fire resistance, insulation efficiency, low post-expansion density, and strong chemical stability. Due to these outstanding qualities, unexpanded vermiculite flakes are extensively utilized as the foundational material for producing expanded vermiculite, horticultural vermiculite, insulation aggregates, fireproof materials, lightweight construction materials, refractory products, friction materials, and industrial absorbents. As a leading supplier in China, WANCHENG MINERAL provides vermiculite flakes in various particle sizes and grades tailored to customer specifications. Our high-quality products are perfect for vermiculite expansion facilities, construction material producers, horticultural substrate suppliers, refractory manufacturers, fireproof board factories, and industrial mineral distributors. We prioritize stable particle size distribution, meticulous material selection, dependable packaging, and a consistent supply for export. Unlike their expanded counterparts, unexpanded vermiculite flakes have a higher bulk density and reduced volume, making them a cost-effective option for transportation, especially for clients with their own expansion equipment. Once expanded, the material becomes significantly lighter and increases in volume, making it ideal for insulation and horticultural uses. Thus, many companies prefer to purchase vermiculite flakes to maintain control over their expansion processes, final bulk density, particle size, and application performance. With our robust capabilities as a reliable factory and supplier, WANCHENG MINERAL is your go-to source for quality vermiculite solutions.

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    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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    FAQ

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