Place of Origin : Monrovia,Liberia
https://www.ytrefractory.com/rock-wool-board.html
Rock Wool Board
Rock wool board is a rigid rock wool insulation board designed to be used as continuous exterior insulation in residential and commercial buildings. It does not produce smoke or spread flames, providing an important line of defense to ensure occupant safety and reduce property damage in the event of a fire.
Yutong's rock wool board is certified by the California State Fire Marshal's Building Materials