Fire-X Glasbord with Surfaseal is made of fiberglass reinforced plastic, and is a durable, flexible building material that will not mold, mildew, rot or corrode. It exhibits excellent resistance to mild chemicals and moisture. The panel has a Class A fire rating for flame spread and smoke development when tested per ASTM E-84. Fire-X Glasbord is also tested per CAN/ULCS102-M for flame spread and smoke development.