New items like tape and filters are made from Fiberglass Mesh, which is a precisely woven, crossing pattern of fiberglass thread. It is not unusual for the manufacturer to spray a PVC coating on it to make it stronger and last longer when it is used as a filter. Most commonly Fiberglass Mesh is found in home depot and DIY stores as reinforcement material for insulation, as a base structural material for grinding wheels, and in a diverse range of drywall repair kits fiberglass mesh tape, and profiles.