This product is designed for vacuum sealing applications in laboratory and industrial flange connections. Made from high-quality silicone, these sealing rings offer excellent resistance to heat, cold, ozone, and atmospheric aging, ensuring reliable leak-proof performance under demanding conditions. Available in multiple sizes ranging from 35 mm to 98 mm inner diameter with a consistent 5.3 mm cross-section, they accommodate various furnace tube outer diameters typical in experimental setups. The simple, robust structure allows for easy installation while maintaining good electrical insulation properties. Suitable for use in vacuum furnaces and other equipment requiring secure flange sealing, these rings provide a durable and cost-effective solution for researchers and technicians working with high-temperature or low-pressure environments.