Super Caltemp® Gold 1700 block insulation is an inorganic, non-combustible insulation with exceptional strength and extremely low water of hydration. Chemically, Super Caltemp Gold 1700 features a xonotlite crystal structure and is composed primarily of lime, silica and reinforcing fibers. The product is gold in color, essentially dust-free, contains no asbestos and can insulate up to 1700°F (927°C).