Grindbeck manufactures Expansion Cork Joint Board. Grindbeck has been awarded ISO 9001:2000 certifications. Expansion Cork Joint Board is a perfect jointing material which follows the movements of other materials. Expansion Cork Joint Board can expand and be compressed time after time without changing its material properties in any way. It is used to absorb thermal movements in concrete structures - airport runways, motorways, bridges, dams and the like. This board can be compressed time and time again without losing its properties or being destroyed.