Fiberglass Baghouse Filter Bags are made from a very strong, dense technical fabric that has been used as a standard in the air filtration industry for many years. They offer excellent performance in high-temperature applications up to 500°F (260°C) and can handle temperature surges up to 550°F (287°C). Fiberglass has moderate resistance to chemicals compared to other filter media materials. Although fiberglass filter bags have high tensile strength, they can’t withstand flex abrasion from pulsing, which is remedied with a 20-wire cage.