Cenospheres

A cenosphere is a lightweight, inert, hollow sphere filled with inert air or gas, typically produced as a byproduct of coal combustion at thermal power plants. The color of cenospheres varies from gray to almost white and their density is about 0.4–0.8 g/cm³, which gives them a great buoyancy.

Flows like a liquid, with the appearance of a powder. Provides lightweight bulk to a varied and expansive range of compounds.

Features: Lightweight