NCCER Millwright Practice Exam

Fiberglass packing material works well in temperatures up to what degree Fahrenheit?

1. 500 degrees F

2. 1,000 degrees F

3. 1,500 degrees F

4. 2,000 degrees F

The correct answer is: 1,000 degrees F

Fiberglass packing material is renowned for its thermal resistance, making it suitable for various high-temperature applications. This type of packing is typically effective in maintaining its properties and performance integrity up to approximately 1,000 degrees Fahrenheit. At this temperature, it can effectively handle thermal expansion and maintain a seal without significant degradation. Temperatures beyond this threshold, such as 1,500 degrees F or 2,000 degrees F, would subject the material to conditions that can lead to chemical breakdown or structural integrity loss, ultimately diminishing its effectiveness as a sealing or insulating material. Understanding the limitations of materials like fiberglass packing is crucial for ensuring the reliability and longevity of mechanical systems in which they are used.