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Expanded Vermiculite Powder
Vermiculite
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Expanded Vermiculite Powder

Expanded vermiculite powder is a lightweight mineral material produced from natural vermiculite ore after high-temperature expansion and further grinding or classification. Natural vermiculite is a hydrated magnesium-aluminum silicate mineral with a layered structure. When heated rapidly, the water trapped between its layers turns into steam and forces the layers to expand. This process creates expanded vermiculite with a low bulk density, porous structure, good thermal insulation, sound absorption, fire resistance, and moisture retention properties.

Compared with regular expanded vermiculite particles, expanded vermiculite powder has a finer particle size and better dispersibility in many formulations. It can be used as a lightweight filler, insulating additive, fire-resistant mineral component, soil amendment material, absorbent powder, and functional filler in construction, agriculture, coatings, refractory materials, friction products, animal feed carriers, and industrial formulations.

WANCHENG MINERAL supplies expanded vermiculite powder for customers who require stable particle size, lightweight performance, good absorption, low thermal conductivity, and reliable bulk supply. The product can be customized according to mesh size, bulk density, moisture, packaging, and application requirements. For customers using the product in technical applications, sample testing before bulk order is recommended to confirm compatibility with their production system.

As a non-metallic mineral material, expanded vermiculite powder is valued for its natural origin, low density, thermal stability, and broad application flexibility. It is especially useful when customers need to reduce material weight, improve insulation, increase porosity, enhance fire resistance, or add a mineral carrier with absorption capacity. WANCHENG MINERAL focuses on quality control, consistent supply, export packaging, and professional communication for global industrial customers.

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    Technical Specifications

    Expanded vermiculite powder can be supplied in different particle size ranges depending on customer application. Fine grades are commonly used in coatings, lightweight fillers, friction materials, absorbents, and special industrial formulations. Coarser powder or fine granule grades can be used in construction materials, insulation mortars, fireproof boards, horticultural blends, and soil improvement products.

    Typical properties include low bulk density, high porosity, good thermal insulation, moisture absorption, and chemical stability. Because expanded vermiculite is porous and lightweight, its bulk density is normally much lower than many other mineral powders. The final bulk density depends on expansion degree, particle size, raw ore quality, and processing method.

    WANCHENG MINERAL can discuss customized grades according to customers' target application, including powder size, density, moisture, color, packaging, and blend requirements. The technical values in this product page are typical reference values and should be confirmed by sample testing and batch data for specific industrial use.

    Main Chemical Composition Table
    Main Technical Parameters Table

    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% Varies by ore source
    K2O 2% - 6% Interlayer component
    CaO 1% - 4% Minor component
    TiO2 0.5% - 2% Trace component
    Loss on Ignition Reduced after expansion Depends on processing

    Item

    Typical Value
    Product Name Expanded Vermiculite Powder
    Material Type Expanded vermiculite
    Appearance Lightweight porous powder
    Color Golden, brown, gray-gold, customized by ore
    Particle Size 20–1000 mesh or customized
    Bulk Density Low, depends on expansion and particle size
    Moisture Low moisture
    Thermal Insulation Good
    Fire Resistance Non-combustible mineral
    Water Absorption Good
    pH Value Neutral to slightly alkaline
    Recommended Use Insulation, fireproof materials, construction, horticulture, coatings, fillers
    Packaging 25kg bags, 20kg bags, jumbo bags, pallets, OEM

    Note: The chemical composition and technical parameters above are typical reference values for expanded vermiculite powder. Final values may vary depending on 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 powder supplied by WANCHENG MINERAL offers a combination of light weight, thermal insulation, absorption, and mineral stability. It is suitable for customers seeking a natural lightweight mineral filler with broad application flexibility.

    1. Lightweight Structure

    The expanded porous structure gives vermiculite powder a low bulk density, helping reduce the weight of final products such as insulation boards, lightweight mortars, coatings, and construction materials.

    2. Good Thermal Insulation

    The air-filled pores inside expanded vermiculite help reduce heat transfer, making it suitable for insulation and heat-resistant applications.

    3. Fire Resistance

    Vermiculite is a non-combustible mineral material and can be used in fireproof coatings, boards, and thermal protection systems.

    4. Moisture Retention and Absorption

    Its porous structure allows it to absorb and retain moisture, which is useful in horticulture, agriculture, carriers, and absorbent products.

    5. Good Dispersibility in Formulations

    Compared with coarse expanded vermiculite particles, powder grades can disperse more uniformly in certain binders and industrial systems.

    6. Customizable Particle Size

    WANCHENG MINERAL can provide different powder grades according to customer requirements and application fields.

    7. Reliable Export Supply

    We provide stable product quality, export packaging, sample support, and technical communication for global customers.

    Expanded vermiculite powder is a lightweight product, so packaging should protect the material from moisture, contamination, and excessive compression during storage and transportation. WANCHENG MINERAL provides flexible packaging options according to customer handling requirements and container loading plans.

    Common packaging options include 25kg bags, 20kg bags, jumbo bags, kraft paper bags, PP woven bags, palletized packaging, and OEM packaging. Because expanded vermiculite powder has a low bulk density, actual bag weight may be adjusted according to volume, particle size, and customer requirements.

    Products should be stored in a dry, clean, and covered warehouse. Customers should avoid rain exposure, moisture, oil contamination, broken packaging, and heavy pressure. For export shipment, palletized packaging can help protect bags and improve loading efficiency.

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

    1. Raw Vermiculite Selection

    Selected vermiculite ore is chosen based on flake quality, expansion rate, impurity level, and suitability for downstream applications.

    2. Crushing and Screening

    Raw vermiculite is crushed and screened to obtain suitable feed material for expansion.

    3. High-Temperature Expansion

    The selected vermiculite is heated rapidly at high temperature. The interlayer water vaporizes and expands the layered structure, forming lightweight expanded vermiculite.

    4. Cooling

    Expanded vermiculite is cooled under controlled conditions to stabilize the particle structure.

    5. Grinding or Fine Classification

    Expanded material is ground or classified into powder grades according to customer requirements.

    6. Screening and Dust Control

    Screening helps control particle size distribution and remove unsuitable particles.

    7. Quality Inspection

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

    8. Packaging and Shipment

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

    Applications

    1. Thermal Insulation Materials

    Expanded vermiculite powder is widely used in lightweight insulation materials because of its porous structure and low thermal conductivity. It can be added to insulation mortar, thermal insulation boards, pipe insulation materials, and fire-resistant lightweight panels. The powder form helps improve mixing uniformity and can be easier to incorporate into certain binder systems than large expanded granules.

    2. Fireproof and Refractory Materials

    Vermiculite is naturally non-combustible and can be used in fireproof coatings, fire-resistant boards, refractory mixes, firestop materials, and heat-resistant composites. Expanded vermiculite powder can contribute to thermal protection, weight reduction, and improved fire resistance in suitable formulations.

    3. Construction Materials

    In construction applications, expanded vermiculite powder can be used in lightweight mortar, plaster, cement-based products, dry-mix materials, wall panels, acoustic panels, decorative coatings, and building additives. It helps reduce density, improve workability, support insulation performance, and create a porous mineral structure.

    4. Horticulture and Agriculture

    Expanded vermiculite powder and fine vermiculite grades can be used in seed starting mixes, potting media, soil improvement products, fertilizer carriers, and moisture retention blends. Its porous structure helps retain water and nutrients, while its lightweight nature improves soil aeration.

    5. Coatings and Paints

    Expanded vermiculite powder can be used as a functional lightweight filler in coatings, textured paints, insulation coatings, fire-resistant coatings, and decorative coatings. It may help improve surface texture, reduce density, and support thermal insulation performance.

    6. Friction Materials

    In brake linings, clutch facings, and other friction products, vermiculite powder can be used as a mineral filler to support friction stability, heat resistance, and formulation balance. Customers should test grade compatibility based on friction material design.

    7. Absorbents and Carriers

    Because of its porous structure, expanded vermiculite powder can be used as a carrier for fertilizers, chemicals, animal feed additives, and absorbent products. It can also help absorb moisture or liquids in certain industrial formulations.

    FAQ

    • Q1: What is expanded vermiculite powder used for?

      Expanded vermiculite powder is used in insulation materials, fireproof materials, lightweight construction products, horticulture, coatings, friction materials, absorbents, carriers, and industrial fillers.

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

    • Q3: Can WANCHENG MINERAL customize particle size?

    • Q4: Is expanded vermiculite powder suitable for fireproof materials?

    • Q5: Can samples be provided before bulk order?

    • Q6: What should customers confirm before ordering?

    Contact WANCHENG MINERAL

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

    WANCHENG MINERAL provides expanded vermiculite powder, customized particle sizes, lightweight mineral filler solutions, export-grade 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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