What is perlite primarily known for after processing?

Perlite is primarily known for its lightweight nature after processing. It is a volcanic glass that, when heated to high temperatures, expands and transforms into a porous, lightweight material. This characteristic makes perlite an excellent choice for various applications, especially in horticulture and construction, where reducing weight is crucial for improving insulation and reducing structural loads.

The lightweight property of perlite allows it to be used in growing media for plants, providing aeration while still being easy to handle. In construction, its low density helps in creating lightweight insulation materials, which can enhance energy efficiency without adding significant weight to the structures. The other characteristics of perlite, while notable, are not its primary identity. For example, it does not typically have high density, and while it may reflect some light, that is not its main feature. Additionally, perlite does have a degree of water absorption, but it is more famous for its structural benefits related to its light weight.