Rockwool International A/S is a multinational manufacturer of stone-wool-based products typically used in insulation, fire protection, plus noise and vibration control applications. The company was established in 1909, began insulation production in 1937 and now operations through the business segments of Insulation Business and Systems Business. Rockwool International A/S employs 10,601 workers in 37 countries and is headquartered in Hedehusene, Denmark.