Which of the following materials is commonly used for making diaphragms?

Rubber is commonly used for making diaphragms due to its excellent flexibility, durability, and ability to maintain a seal under varying pressure conditions. Diaphragms are often found in applications such as valves and actuators, where they serve as a barrier that separates different chambers while allowing movement. Rubber’s elastic properties enable it to expand and contract with pressure changes without losing its shape or forming leaks. This makes it an ideal choice for applications that require reliable performance over a wide range of pressures and temperatures.

While plastic composites can also be used in specific applications for diaphragms, they may not offer the same level of flexibility and sealing properties as rubber in most common scenarios. Wood and glass are generally unsuitable for diaphragm applications; wood is not elastic, leading to potential cracking and failure under pressure, and glass is rigid and breaks easily, making it impractical for use in dynamic environments.