A flange gasket is a type of sealing material that is used to create a tight seal between two flanges. Flanges are typically used to connect pipes, valves, or other equipment together in a piping system. The gasket is placed between the two flanges and helps to prevent leakage of fluids or gases from the joint. Flange gaskets are usually made from materials such as rubber, silicone, or metal, depending on the specific application and the type of fluid or gas being transported. They are designed to withstand high temperatures, pressure, and chemical exposure to ensure a reliable and durable seal.