Airweave® UHT 300PGL and Airweave® UHT 450PGL are premium non-woven blended, fiberglass breather for ultra high temperature applications. It is safer to use these breathers in place of woven fiberglass breathers. They make an easier transition for the vacuum bag and in any radius. One layer provides good breathing to 800°F (427°C). Airweave® UHT 300PGL and Airweave® UHT 450PGL are designed for use with high temperature thermoset and thermoplastic resin systems.