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.
The composition of perlite resembles that of acid lavas, for example, liparite and dacite, which are chiefly composed of 65 to 75 percent SiO 2 and 10 to 15 percent Al 2 O 3 and which also include admixtures of Fe 2 O 3, CaO, MgO, SO 3, and R 2 O in proportions that range from fractions of a percent to single percentage units.