Fluoroelastomer (Viton?) FDA O-rings are a type of sealing device that are commonly used in food and pharmaceutical applications. They are made from a synthetic rubber material that offers excellent chemical resistance and high temperature tolerance. Fluoroelastomer O-rings are FDA compliant, meaning they meet the standards set by the US Food and Drug Administration for use in contact with food and pharmaceuticals. They are often used in applications such as sealing pipes, valves, and pumps in the food and pharmaceutical industries, as well as in other applications that require a reliable seal in harsh environments.