Perlite

Definition

Perlite is an expanded volcanic rock used as a lightweight aggregate in concrete and plaster, and as an insulating fill.

Purpose

Perlite's lightweight and insulating properties make it valuable in construction and horticulture. It improves the performance of concrete and plaster, enhances soil aeration, and provides thermal insulation.

Examples of Use

• Construction: Used as an aggregate in lightweight concrete and plaster to reduce weight and improve thermal insulation.
• Horticulture: Mixed into potting soils to improve aeration and drainage for plants.
• Insulation: Used as loose-fill insulation in masonry walls and attics to improve energy efficiency.

Related Terms

• Vermiculite: A mineral often used similarly to perlite for insulation and soil conditioning.
• Lightweight Aggregate: Materials used in construction to reduce the weight of concrete, such as perlite, pumice, and expanded clay.
• Soil Amendment: Substances added to soil to improve its physical properties, including perlite and compost.

Notes

• Properties: Perlite is non-toxic, stable, and retains its shape and insulating properties over time.
• Processing: Perlite is expanded by heating to a high temperature, causing it to pop like popcorn and increase in volume.