Perlite is a light-weight oderless ,sterilized,heat-expanded volcanic mineral. It is a naturally occur siliceous volcanic rock containing 6% combine with water.
The perlite expands 15 times its original volume. Expanded Perlite have excellent thermal conductivity !
Perlite is inorganic and non-combustable, and the loose-flowing nature of expanded perlite is ideal for filling odd-shaped spaces.