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Expanded Vermiculite Powder | China Suppliers & Factory for Lightweight Insulation and Fire-Resistant Materials

Expanded vermiculite powder is a lightweight mineral product derived from natural vermiculite ore, which undergoes a high-temperature expansion process followed by grinding or classification. As a hydrated magnesium-aluminum silicate mineral characterized by its layered structure, vermiculite expands when heated, resulting in a product that features low bulk density, a porous configuration, excellent thermal insulation, sound absorption, fire resistance, and moisture retention properties. Unlike standard expanded vermiculite particles, our expanded vermiculite powder boasts a finer particle size and enhanced dispersibility, making it ideal for various formulations. This versatile material serves multiple applications, acting as a lightweight filler, insulating additive, fire-resistant mineral component, soil amendment, absorbent powder, and functional filler across industries such as construction, agriculture, coatings, refractory materials, friction products, and animal feed carriers. WANCHENG MINERAL is a leading supplier of high-quality expanded vermiculite powder in China, providing products with consistent particle size, lightweight performance, and good absorption. Our factory offers customizable options based on mesh size, bulk density, moisture content, packaging, and specific application needs. We recommend sample testing for technical applications before placing bulk orders to ensure compatibility with production systems. As a non-metallic mineral material, our expanded vermiculite powder highlights its natural origins, low density, thermal stability, and application versatility. Customers looking to reduce material weight, enhance insulation, increase porosity, improve fire resistance, or employ a mineral carrier with absorbent capabilities will find this product indispensable. WANCHENG MINERAL prioritizes quality control, reliable supply, export packaging, and professional communication to meet the demands of global industrial clients.

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Product Details

Chemical Composition Analysis

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

Frequently Asked Questions

What is the primary chemical compound in this material?

The primary component is Silicon Dioxide (SiO2), typically ranging between 35% and 45%, which forms the fundamental silicate structure of the mineral.

Why does Magnesium Oxide (MgO) hold significant value in this profile?

Magnesium Oxide (MgO) accounts for 15% to 25% of the composition and is a characteristic indicator of authentic vermiculite structures, contributing to structural stability and heat tolerance.

What causes variations in Iron Oxide (Fe2O3) levels?

Iron Oxide content normally ranges from 5% to 12% and varies naturally based on the geographical location and geological conditions of the specific ore deposit.

What does "Loss on Ignition" signify in the composition?

Loss on Ignition measures the release of structural water and volatile matter during thermal processing. It is significantly reduced after the material undergoes heat expansion.

Are trace elements like TiO2 and CaO impactful to product quality?

Titanium Dioxide (0.5% - 2%) and Calcium Oxide (1% - 4%) are minor trace elements that are standard in natural silicate ores and do not negatively affect standard industrial or agricultural applications.

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