Which of the following materials is NOT commonly resistant to corrosive fluids for diaphragms?

Bronze is not commonly considered resistant to corrosive fluids, particularly when compared to the other materials listed. While bronze can have certain resistance characteristics, it is primarily composed of copper and tin, making it susceptible to corrosion in various aggressive environments, such as those containing chlorides or other reactive substances.

In contrast, stainless steel is known for its excellent resistance to a wide variety of corrosive environments due to its chromium content, which helps form a protective oxide layer. Polyethylene, a type of plastic, is also highly resistant to many chemicals, including corrosive fluids, which makes it suitable for applications involving hostile environments. Neoprene, a synthetic rubber, is designed to withstand various chemicals, oils, and weather conditions, providing good resistance in many corrosive scenarios.

Therefore, bronze's limitations when exposed to corrosive fluids are why it is not typically selected for diaphragm applications where corrosion resistance is essential.