Gyproc® Core Board (For Shaft & Duct Encasement) is a 19mm thick gypsum board used in Lift & Service Shaft areas where High Performance Fire Resistance from 60minutes to 120minutes is required. These Shaftwalls built with Gyproc® Core Board are resistant to moisture with less than 5% water absorption. Gyproc® Core Board consists of aerated gypsum core with glass fibers & other fire and moisture resistive additives that are encased & firmly bonded to green colored paper liners. Product Application Lifts & Service Shaft / Duct wall in Hotel, Residential, Commercial and Hospital segments.