FABROCK™ DD is a dual-density board insulation that is designed to be fabricated while maintaining its integrity. A high-density layer and a lower density layer work together to give this product compressive resistance and excellent sound absorbency. Ideal for use in acoustic panels but not limited to this application, dual-density insulation has many uses in different OEM applications. As with all ROCKWOOL products, FABROCK™ DD has excellent fire and thermal properties, is dimensionally stable, vapor permeable and will not encourage the growth of mold.