Vermiculite is a naturally occurring mineral that expands when heated, creating a lightweight material with strong absorbent, insulating, and fire-resistant properties.

Is vermiculite safe to use?

Yes. Whittemore vermiculite is sourced and tested to ensure it is free from asbestos contamination and meets established industry safety standards.

What is vermiculite used for?

Vermiculite is used across horticulture, construction, industrial applications, environmental systems, and pool base materials,anywhere absorbency, insulation, or fire resistance is required.

What grades of vermiculite are available?

Whittemore offers both domestic and imported vermiculite grades: • 2 Domestic Grades – Fine Grade and Super Fine Grade • 4 Imported Grades – available in a range of sizes to match your application Contact us to find the right grade for your project.

How is vermiculite different from perlite?

Vermiculite is designed for moisture and nutrient retention, while perlite improves drainage and aeration. Many applications use both materials together.

Can I order vermiculite in bulk?

Yes. Bulk, super sack, and bagged options are available depending on your operational needs.

Whittemore Vermiculite

Premium Expanded Vermiculite

Whittemore's expanded vermiculite is exfoliated to deliver reliable moisture retention, thermal insulation, and non-combustible performance,trusted across horticulture, construction, industrial, environmental, and pool applications.

Applications

What is Vermiculite?

Vermiculite is a naturally occurring mineral in the mica family , a hydrated magnesium-aluminum-iron silicate , that contains layers of water locked between its crystalline sheets. When heated rapidly, that water flashes to steam and forces the layers apart, exfoliating the mineral into lightweight, accordion-like granules.

Heated to roughly 1400°F, vermiculite ore expands many times its original volume into a porous, absorbent, fire-resistant material. Unlike perlite , which is engineered for drainage and aeration , vermiculite is engineered for retention: holding moisture, nutrients, and heat where they're needed.

At Whittemore, raw vermiculite ore is screened, expanded, and graded in our facility under strict quality controls, producing a clean, asbestos-tested, dimensionally stable material trusted across horticulture, construction, industrial, environmental, and pool applications.

Benefits of Vermiculite

High Absorbency

Retains and gradually releases moisture, supporting plant health and environmental applications

Thermal Insulation & Fire Resistance

Non-combustible and stable at high temperatures, ideal for fireproofing and insulation systems

Lightweight & Compressible

Reduces structural weight while maintaining coverage and performance

Chemically Inert

Does not react with other materials, making it suitable for controlled and sensitive applications

Dimensionally Stable

Maintains structure over time without breaking down or compacting

Why Choose Whittemore Vermiculite?

Naturally Expanded for Insulation & Absorbency

Heated to high temperatures to create a lightweight, accordion-like structure designed for moisture retention, thermal insulation, and fire resistance.

Carefully Sourced & Safety-Tested

We partner with trusted suppliers in Africa, Brazil, and the U.S., requiring strict testing protocols to ensure clean, asbestos-free material that meets industry standards.

Built for Stable, Reliable Performance

Our controlled expansion process delivers consistent particle structure and dependable performance across horticulture, construction, and industrial applications.

Our Process

Exfoliated Through Controlled Expansion

Vermiculite is a naturally occurring mineral in the mica family. At Whittemore, screened ore is rapidly heated to temperatures approaching 1400°F, causing it to expand into a lightweight, absorbent, and fire-resistant material.

Precision Exfoliation

High-temperature expansion creates a porous structure designed for absorbency and insulation

Selective Global Sourcing

We partner with established mining operations in the U.S., Brazil, and Africa to ensure consistent raw material quality

Strict Safety & Testing Protocols

All materials are tested to ensure they are free from asbestos contamination and meet industry best practices

Safety & Sourcing Commitment

Whittemore sources vermiculite only from suppliers that meet strict quality and safety standards. All materials are tested to ensure compliance with industry best practices and are verified asbestos-free.

Learn more about vermiculite safety

Frequently Asked Questions

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