The antonyms for the word "Expanded PTFE" are confined, limited, narrow, restricted, and closed. These words indicate a lack of flexibility or adaptability, which is the opposite of the expanded PTFE material's characteristics. Expanded PTFE is a unique material that has been mechanically stretched to create a porous structure, resulting in remarkable properties such as high flexibility, excellent chemical resistance, and outstanding temperature tolerance. Its ability to conform to irregular surfaces makes it an ideal choice for use in various industries, including chemical processing, pharmaceutical, and medical. Overall, the antonyms for expanded PTFE suggest rigidity, limitation, and decreased adaptability, which are traits that do not apply to this extraordinary material.