Phifer offers a complete selection of fiberglass insect screening. Phiferglass, Phifer’s trademarked fiberglass screening, has been the standard in the industry for decades. It is woven from permanent glass yarn, which has been coated with a protective vinyl to ensure lasting beauty, color and flexibility and will not rust, corrode or stain. Phiferglass is produced under the most exacting conditions to meet rigid specifications and has passed 1200 hours of QUV accelerated weathering.