Glass Fiber, Mineral Wool, Rock Wool, MMVF, Glass Wool, HVAC

HVAC Glass Fiber

The HVAC system is a common source of glass fiber in indoor office and school environments. These glass fibers are generally coated with particles impacted onto their surfaces that mark them as having been exposed to a moving air stream. These impacted particles typically have diameters smaller than that of the fiber on which they rest. The color of the resin associated with glass fiber from the HVAC system varies. It may be yellow, orange, red, green, gray, or black. The same "soundboard" may have more than one color of resin on it. One common combination is a yellow resin used for the bulk of the glass fiber mat with a coating of black, mineral-filled resin on the outer surface of the panel. The resin used for the soundboard panels is generally heavily filled with clay or silica.