The series premiered on demand on November 23, 2015, and on Syfy on December 14, 2015. A 13-episode second season premiered on February 1, 2017. In March 2017, Syfy renewed The Expanse for a 13-episode third season to air in 2018.
Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian.
Expanded perlite grains have a low density that ranges from 70 to 600 kg/m 3; they are thus suitable for use as sand or rubble in aggregates for lightweight concrete as well as in heat-insulating products, for example, those made from perlite and bitumens, perlite and silicates, and perlite and ceramics.