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Expanded Vermiculite
Vermiculite
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Expanded Vermiculite

Expanded vermiculite is a lightweight mineral material produced by heating selected raw vermiculite ore at high temperature. During the expansion process, the layered water inside the vermiculite structure is rapidly converted into steam, causing the mineral flakes to expand into accordion-like particles with very low bulk density, high porosity, and excellent thermal insulation performance. The final product is light, non-metallic, chemically stable, and easy to mix with other materials.

Because of its unique structure, expanded vermiculite is widely used in horticulture, agriculture, thermal insulation, fire-resistant materials, lightweight concrete, dry mortar, refractory mixes, packaging, animal bedding, soil improvement, seed germination, and industrial filler applications. It can retain water and nutrients in horticultural systems while also improving aeration and soil looseness. In construction and insulation applications, it helps reduce weight, improve thermal performance, and increase fire resistance.

WANCHENG MINERAL supplies expanded vermiculite in different particle sizes and grades according to customer applications. Common grades include fine, medium, coarse, and super coarse particles. The product can be supplied for professional growers, potting soil manufacturers, construction material factories, fireproof board manufacturers, refractory producers, insulation contractors, distributors, and industrial users. We can provide bulk supply, export packaging, sample support, and customized particle size solutions.

For international buyers, choosing the correct expanded vermiculite grade is important. Horticultural applications usually focus on clean particles, water retention, aeration, and suitable size distribution. Construction and insulation applications usually require lightweight density, stable thermal behavior, and consistent particle size. Refractory applications may require higher temperature stability and specific chemical composition. WANCHENG MINERAL helps customers select suitable grades according to the final application and market requirements.

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    Technical Specifications

    Expanded vermiculite can be supplied in multiple particle sizes, densities, and application grades. The most common particle size ranges include 0.5-1 mm, 1-3 mm, 2-4 mm, 3-6 mm, and customized sizes. Fine grades are suitable for seed germination, potting soil blends, dry mortar, coatings, and lightweight fillers. Medium grades are widely used in horticulture, insulation boards, fireproof materials, and packaging. Coarse grades are commonly used for plant propagation, soil aeration, lightweight concrete, animal bedding, and loose-fill insulation.

    The technical performance of expanded vermiculite depends on raw ore quality, expansion temperature, particle size distribution, bulk density, moisture, cleanliness, and packaging method. Typical expanded vermiculite is lightweight, odorless, chemically stable, and non-combustible under normal industrial use conditions. It has high porosity and excellent water-holding capacity, making it useful in horticultural and agricultural systems. It also provides good thermal insulation and acoustic absorption in construction materials.

    The values listed in the technical tables are typical reference data. Final specifications should be confirmed according to customer requirements and product grade. WANCHENG MINERAL can discuss customized particle size, density range, packaging, and test requirements before bulk orders.

    Main Chemical Composition Table
    Main Technical Parameters Table

    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

    Item

    Typical Value
    Product Name Expanded Vermiculite
    Material Type Expanded natural vermiculite
    Appearance Lightweight accordion-like particles
    Color Golden, brown, silver-gray, mixed natural color
    Common Particle Size 0.5-1 mm, 1-3 mm, 2-4 mm, 3-6 mm, customized
    Bulk Density Approx. 60-180 kg/m3 depending on grade
    Moisture Low moisture
    pH Value Neutral to slightly alkaline
    Thermal Conductivity Low thermal conductivity
    Combustibility Non-combustible mineral
    Water Retention High
    Recommended Use Horticulture, insulation, construction, fireproof materials, refractory, packaging
    Packaging 50L, 80L, 100L bags, 25kg bags, jumbo bags, OEM

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

    Advantages
    Packaging
    Production Process

    Expanded vermiculite from WANCHENG MINERAL provides multiple advantages for horticultural, construction, insulation, and industrial users.

    1. Lightweight Structure

    Expanded vermiculite has very low bulk density compared with many mineral aggregates. It helps reduce product weight in soil mixes, construction materials, insulation systems, and packaging applications.

    2. Excellent Water Retention

    The porous structure allows expanded vermiculite to hold water and nutrients, making it especially useful for seed germination, plant propagation, and potting soil blends.

    3. Good Thermal Insulation

    Expanded vermiculite contains many internal air spaces, which help reduce heat transfer and improve thermal insulation performance.

    4. Fire-Resistant Performance

    Expanded vermiculite is non-combustible and can be used in fire-resistant boards, mortars, coatings, and insulation materials.

    5. Good Mixing Compatibility

    It can be mixed with soil, peat, coco coir, cement, gypsum, resin, coatings, refractory binders, and other industrial materials.

    6. Customizable Particle Sizes

    WANCHENG MINERAL can supply different particle sizes and grades according to horticultural, construction, insulation, and refractory applications.

    7. Reliable Export Supply

    With export packaging, sample support, and flexible supply capacity, WANCHENG MINERAL supports distributors, manufacturers, and project buyers worldwide.

    Packaging is very important for expanded vermiculite because the product is lightweight, porous, and compressible. Proper packaging helps maintain particle size, reduce breakage, prevent moisture exposure, and improve loading efficiency. WANCHENG MINERAL provides flexible packaging options according to customer use and export requirements.

    Common packaging options include 100L bags, 80L bags, 50L bags, 25kg bags, jumbo bags, compressed packaging, palletized packaging, and OEM printed bags. For horticultural retail customers, volume-based packaging such as liters is often preferred because expanded vermiculite has low density. For industrial users, jumbo bags or compressed packaging may reduce transportation cost and improve warehouse handling.

    Products should be stored in a dry, clean, and covered warehouse. Customers should avoid moisture, rain exposure, heavy compression, oil contamination, mixed materials, and broken packaging. Before using in horticultural or construction applications, customers should select the proper particle size and test mixing ratio in their own production system.

    WANCHENG MINERAL follows a controlled production process to ensure stable expanded vermiculite quality.

    1. Raw Vermiculite Selection

    Selected vermiculite ore is chosen based on flake structure, expansion ratio, impurity level, and suitability for final application.

    2. Crushing and Pre-Screening

    Raw vermiculite is crushed and pre-screened to prepare suitable particle sizes for expansion.

    3. High-Temperature Expansion

    Prepared vermiculite is heated rapidly at high temperature. Internal water turns into steam and expands the layered structure into lightweight particles.

    4. Cooling

    The expanded material is cooled under controlled conditions to stabilize particle structure.

    5. Screening and Classification

    Expanded vermiculite is classified into fine, medium, coarse, and customized particle size grades.

    6. Dust Control

    Dust and unsuitable particles are reduced according to product grade and application requirements.

    7. Quality Inspection

    Each batch can be inspected for appearance, particle size, bulk density, moisture, expansion quality, and packaging condition.

    8. Packaging and Shipment

    Qualified products are packed according to export standards or customer requirements.

    Applications

    1. Horticulture and Agriculture

    Expanded vermiculite is widely used in seed germination, potting soil, plant propagation, hydroponic growing media, greenhouse cultivation, and soil amendment. It helps retain moisture and nutrients while improving aeration around plant roots. Its lightweight structure makes it easy to handle and mix with peat, coco coir, perlite, compost, and other growing media components.

    2. Thermal Insulation Materials

    Expanded vermiculite has low bulk density and excellent insulation performance. It is used in insulation boards, loose-fill insulation, roof insulation, wall panels, pipe insulation, industrial insulation materials, and energy-saving construction products.

    3. Fireproof and Fire-Resistant Materials

    Because expanded vermiculite is non-combustible and thermally stable, it is used in fireproof boards, fire doors, fire-resistant coatings, fireproof mortars, passive fire protection materials, and high-temperature insulation systems.

    4. Lightweight Construction Materials

    Expanded vermiculite can be used in lightweight concrete, dry mortar, plaster, gypsum boards, decorative panels, lightweight blocks, and cement-based insulation materials. It reduces weight while improving thermal and acoustic properties.

    5. Refractory Materials

    Expanded vermiculite can be used in refractory mixes, insulation bricks, furnace lining materials, kiln insulation, and high-temperature industrial products. In these applications, grade selection should be based on temperature requirements and formulation compatibility.

    6. Packaging and Cushioning Materials

    Expanded vermiculite is used as a lightweight cushioning and absorbent material in packaging applications. It can protect fragile items, absorb liquid leakage in certain industrial packaging systems, and fill empty spaces during transport.

    7. Animal Bedding and Environmental Uses

    Expanded vermiculite may be used in animal bedding, moisture control, odor control formulations, composting systems, and environmental absorbent applications where lightweight mineral absorbency is required.

    FAQ

    • Q1: What is expanded vermiculite used for?

      Expanded vermiculite is used in horticulture, seed germination, potting soil, insulation materials, fireproof boards, lightweight construction, refractory products, packaging, and animal bedding.

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

    • Q3: Can WANCHENG MINERAL customize particle size?

    • Q4: Is expanded vermiculite suitable for horticulture?

    • Q5: What packaging options are available?

    • Q6: Can samples be provided before bulk order?

    Contact WANCHENG MINERAL

    Looking for a reliable expanded vermiculite manufacturer and supplier in China?

    WANCHENG MINERAL provides high-quality expanded vermiculite, horticultural vermiculite, insulation vermiculite, fireproof vermiculite, customized particle sizes, export packaging, sample support, and technical communication for global customers.
    Contact WANCHENG MINERAL today to request product specifications, samples, technical support, and competitive pricing.
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