DF99 is an aerospace grade material developed by Dynaflex. It is a proprietary blend of elastomers, thermoplastics, and thermoplastic elastomers (TPE), allowing for superior adhesion, flexibility, and stretch. It is a strong, durable, and lightweight material suitable for a variety of applications, such as low-temperature gaskets, O-rings, and other dynamic seals. It is also designed to have good temperature resistance and to perform well in harsh environmental conditions, including exposure to oils and fuels.