What material is commonly used for the spring-loaded seal on modern compressors?

The material commonly used for the spring-loaded seal on modern compressors is metal or carbon. This choice is correct because metal and carbon provide the necessary strength and durability required in high-pressure environments typical of compressor operations. Metal seals can withstand significant wear and tear while maintaining effective sealing properties, and carbon, often used in the form of carbon-graphite, has excellent properties for friction and wear resistance.

Using materials like rubber or plastic, while common in various applications, may not hold up in the demanding conditions found in compressors, where factors such as temperature fluctuations, pressure, and exposure to chemicals can lead to wear and failure. Glass is unsuitable for this purpose as it would not provide the durability or flexibility needed for a spring-loaded seal, making it ineffective in the operational context of compressors. Thus, metal or carbon is the best choice, ensuring reliable performance and longevity.