What is Rockwool? Rockwool is Recycled Steel Slag from the Blast Furnace Mills in the Great Lakes Region of the US and a Sustainable Mineral Trap Rock Found in San Antonio, TX. These materials a melted down and combined in a spinner similar to that of a cotton candy machine and high velocity air is blown across fiberizing the rock. This is a naturally occurring process in Hawaii when a volcano erupts and the ocean winds blow across the lava thereby fiberizing the rock.

Does Rockwool Settle? ­ No According to the US Department of Energy ­ "If the cavity is completely filled with insulation at the proper density, no significant settling should occur. Manufactures guidelines suggest that you should blow a minimum density of 4.0 lbs. per cubic ft.

Does Rockwool Contain Asbestos? No, Rockwool is ecologically safe. It does not contain asbestos, cellulose, ground newspapers, cardboard, rags, phenolics, batt trim, polymeric isocyanates, or resins. Rockwool does not need nor contain any chemicals.

Will Rockwool sustain mold, mildew, or fungus growth? No, because Rockwool is an inorganic material it will not absorb moisture, therefore it will not rot, support mildew or fungus growth, attract or support vermin.

Does Rockwool Burn? No, it is listed under ASTM E 136 as Non-Combustible. There have been numerous documentation that state Rockwool contributed to the containment of a fire and prevented further loss of property and potential loss of life. Fiberglass also listed as Non-Combustible has a melting point of 900° F, where as Rockwool has a melting point of 2100° F.

Is Rockwool a corrosive material? No, per ASTM E 764 for corrosion; Rockwool passed with no signs of corrosion. According to the synopsis paper published by ASTM STP1030 EB ­ "It was found that moisture absorption by the insulation was the primary factor in causing corrosion but required that chemical activity from insulation components also be present. No corrosion occurred in the absence of insulation or in rockwool and glassfiber insulation. All cellulose insulations caused some corrosion; mostly this was minimal, but in a few cases severe pitting resulted".