The molten aluminum being poured out onto the thin black fabric is bubbling at a scorching 1500 degrees Fahrenheit.

The fabric doesn’t catch fire, it doesn’t get burned through and there’s not a single hole in it.

Explains National Geographic’s “The Showdown of the Unbeatables”:
“CarbonX is an acrylic fiber that is partially charred in an incinerator, a carbon sheath forms around an unburned acrylic core. When this charred fiber is exposed to heat, the acrylic core burns completely, absorbing the heat energy of the flame.”

CarbonX via Sploid.