Non-combustible stone wool board faced on one side with fiberglass reinforced aluminium foil. The board contains a special granulate which releases its crystallised water in the event of fire. Conlit Ductrock is supplied in a standard thickness of 60 mm. The weight of the board depends on the added granulate. Conlit Ductrock had been specifically developed for the fire resistant cladding of metal vertical and horizontal right-angled ventilation ducts. Depending on the product used, it is fire resistant for 60, 90 or 120 minutes.