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Vermiculite Flakes / Unexpanded Vermiculite
Vermiculite
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Vermiculite Flakes / Unexpanded Vermiculite

Vermiculite flakes, also known as unexpanded vermiculite or raw vermiculite concentrate, are natural layered mineral particles processed from selected vermiculite ore. Before thermal expansion, vermiculite appears as golden brown, bronze, yellowish, or dark brown flakes with a natural mica-like layered structure. When heated rapidly at high temperature, the water molecules inside the crystal structure vaporize and cause the material to expand into lightweight, porous expanded vermiculite.

Vermiculite is a hydrated magnesium-aluminum silicate mineral with excellent thermal expansion behavior, fire resistance, insulation performance, low density after expansion, and good chemical stability. Because of these characteristics, unexpanded vermiculite flakes are widely used as the raw material for producing expanded vermiculite, horticultural vermiculite, insulation aggregates, fireproof materials, lightweight construction materials, refractory products, friction materials, and industrial absorbents.

WANCHENG MINERAL supplies vermiculite flakes in different particle sizes and grades according to customer requirements. Our products can be used by vermiculite expansion plants, construction material manufacturers, horticultural substrate suppliers, refractory producers, fireproof board factories, and industrial mineral distributors. We focus on stable particle size distribution, clean material selection, reliable packaging, and long-term export supply.

Unlike expanded vermiculite, unexpanded vermiculite flakes have higher bulk density and lower volume. This makes them more economical for transportation when customers have their own expansion equipment. After expansion, the material becomes much lighter and larger in volume, which is suitable for insulation and horticultural applications. Therefore, vermiculite flakes are often purchased by companies that need to control their own expansion process, final bulk density, particle size, and application performance.

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    Technical Specifications 

    Vermiculite flakes can be supplied in different sizes depending on the final use. Coarse grades are often preferred for expansion into large expanded vermiculite particles used in horticulture, insulation fill, fireproof boards, and lightweight aggregates. Medium and fine grades are suitable for construction materials, friction materials, refractory mixtures, coatings, and industrial filler applications. The final specification should be selected according to expansion equipment, target expanded density, final particle size, and application requirements.

    Typical available particle sizes may include 0.3-1 mm, 1-3 mm, 2-4 mm, 3-6 mm, 5-8 mm, or customized grades. Expansion ratio, moisture, color, impurity level, and particle size distribution can vary depending on raw ore source and processing method. For customers purchasing vermiculite flakes for expansion, sample testing is recommended before bulk orders to confirm expansion performance under the customer's equipment conditions.

    WANCHENG MINERAL can discuss particle size, packaging, moisture control, and export requirements according to customer application. The technical values listed in this document are typical reference values only. Final product data should be confirmed according to actual grade, batch testing, and customer specification.

    Main Chemical Composition Table
    Main Technical Parameters Table

    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

    Item

    Typical Value
    Product Name Vermiculite Flakes / Unexpanded Vermiculite
    Material Type Natural hydrated magnesium-aluminum silicate
    Appearance Golden brown, bronze, yellowish brown or dark flakes
    Available Size 0.3-1 mm, 1-3 mm, 2-4 mm, 3-6 mm, 5-8 mm, customized
    Expansion Performance Good, grade-dependent
    Moisture Controlled, customized by grade
    Bulk Density Higher than expanded vermiculite
    Thermal Resistance Good
    Chemical Stability Good
    Recommended Use Expansion, horticulture, insulation, fireproof board, construction, refractory, fillers
    Packaging 25kg bags, jumbo bags, pallets, OEM

    Note: The chemical composition and technical parameters above are typical reference values for natural vermiculite flakes. Final values may vary depending on raw ore source, particle size, processing method, production batch, and customer testing method. WANCHENG MINERAL can provide samples and specification discussion before bulk orders.

    Advantages
    Packaging
    Production Process

    Vermiculite flakes supplied by WANCHENG MINERAL offer a reliable raw material solution for customers who need stable unexpanded vermiculite for expansion and downstream processing.

    1. Good Expansion Performance

    Selected vermiculite flakes can expand under suitable heating conditions, producing lightweight and porous expanded vermiculite. Expansion performance can be tested according to customer process requirements.

    2. Natural Layered Mineral Structure

    The layered structure of vermiculite provides thermal insulation, fire resistance, and functional filler properties. This structure is the key reason for its wide use in insulation and construction materials.

    3. Lower Shipping Volume Than Expanded Vermiculite

    Unexpanded vermiculite has much higher density than expanded vermiculite, allowing customers with expansion equipment to reduce transportation volume and expand material locally.

    4. Customizable Particle Size

    WANCHENG MINERAL can supply different particle sizes for different expansion systems and final applications.

    5. Wide Downstream Application Range

    Vermiculite flakes can be processed into products used in horticulture, construction, insulation, fireproof boards, refractory materials, and industrial fillers.

    6. Export Packaging and Stable Supply

    WANCHENG MINERAL provides export-grade packaging, sample support, customized communication, and stable supply for international customers.

    Packaging for vermiculite flakes should protect the material from moisture, contamination, excessive crushing, and mixing with other minerals. Since vermiculite flakes are layered mineral particles, rough handling may increase fine powder content and affect particle size distribution. WANCHENG MINERAL provides packaging solutions suitable for long-distance transportation and industrial storage.

    Common packaging options include 25kg PP woven bags, 25kg kraft paper bags, jumbo bags, palletized packaging, container bulk loading, and OEM packaging. For customers requiring cleaner handling, inner plastic liners or pallet wrapping can be arranged according to order requirements.

    Products should be stored in a dry, clean, and covered warehouse. Avoid rain, high humidity, oil contamination, strong pressure, and broken packaging. Before use, customers should inspect particle size and moisture condition according to their production requirements.

    WANCHENG MINERAL follows a controlled production process to ensure stable vermiculite flakes for international customers.

    1. Raw Ore Selection

    Selected vermiculite ore is chosen according to color, flake structure, expansion potential, impurity level, and customer application requirements.

    2. Crushing and Liberation

    The raw ore is crushed to release vermiculite flakes from associated minerals while controlling excessive breakage.

    3. Screening and Classification

    The material is screened into different particle size ranges according to customer specifications.

    4. Impurity Removal

    Impurities such as stones, dust, and unsuitable particles are reduced through sorting, screening, and processing steps.

    5. Drying or Moisture Control

    Moisture is controlled to improve storage stability and shipping performance.

    6. Quality Inspection

    Each batch can be inspected for particle size, appearance, moisture, impurity level, expansion performance, and packaging condition.

    7. Packaging and Shipment

    Qualified vermiculite flakes are packed according to export standards or customer requirements.

    Applications

    Vermiculite flakes are mainly used as a raw material that can be expanded or processed further. They are also used directly in some industrial formulations where layered mineral structure, thermal stability, and mineral filler properties are required.

    1. Expanded Vermiculite Production

    The most important application of unexpanded vermiculite is the production of expanded vermiculite. When heated, vermiculite flakes expand into lightweight particles with excellent thermal insulation and fire resistance. Expanded vermiculite is widely used in horticulture, insulation, construction, fireproof boards, and packaging.

    2. Horticulture and Growing Media

    After expansion, vermiculite is widely used in seed germination, potting soil, hydroponic substrates, plant propagation, and soil improvement. Vermiculite helps retain moisture, improve aeration, and support root development. Vermiculite flakes are commonly purchased by producers who expand and grade the material for horticultural use.

    3. Thermal Insulation Materials

    Expanded vermiculite produced from vermiculite flakes is used as loose-fill insulation, insulation boards, high-temperature insulation layers, and lightweight insulating aggregates. Its low thermal conductivity and fire resistance make it suitable for building and industrial insulation applications.

    4. Fireproof Boards and Fire Protection

    Vermiculite is widely used in fireproof boards, fire doors, fire-resistant panels, passive fire protection systems, and refractory insulation products. The mineral structure helps provide heat resistance and dimensional stability in fire protection materials.

    5. Lightweight Construction Materials

    Vermiculite can be used in lightweight concrete, plaster, mortar, roof insulation, wall panels, and acoustic materials. It helps reduce density while improving thermal and fire performance.

    6. Refractory and High-Temperature Products

    Vermiculite flakes and expanded vermiculite can be used in refractory mixes, insulation castables, furnace insulation, heat shields, and high-temperature boards.

    7. Friction Materials and Industrial Fillers

    Vermiculite may be used in brake linings, clutch facings, gaskets, sealants, coatings, and other industrial filler systems where heat resistance and layered mineral structure are useful.

    FAQ

    • Q1: What are vermiculite flakes?

      Vermiculite flakes are unexpanded vermiculite particles processed from natural vermiculite ore. They can expand into lightweight expanded vermiculite after high-temperature heating.

    • Q2: What is the difference between vermiculite flakes and expanded vermiculite?

    • Q3: Can WANCHENG MINERAL customize particle size?

    • Q4: Are vermiculite flakes suitable for horticulture?

    • Q5: Can samples be provided before bulk order?

    • Q6: What should customers confirm before ordering?

    Contact WANCHENG MINERAL

    Looking for a reliable vermiculite flakes and unexpanded vermiculite manufacturer and supplier in China?

    WANCHENG MINERAL provides vermiculite flakes, raw vermiculite, unexpanded vermiculite, customized particle sizes, export-grade packaging, sample support, and stable bulk supply for global customers.
    Contact WANCHENG MINERAL today to request product specifications, samples, technical support, and competitive pricing.
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