Gaskets can be ruined by which of the following factors?

• A. Water and moisture
• B. Abrasive water
• C. Cold temperatures only
• D. Dirt, oil, excessive heat, excessive exposure to sunlight, ozone

Answer: (D)

Gaskets fail when the sealing material is degraded by environmental exposure and contaminants. Excessive heat accelerates aging and can make the material hard, brittle, or to creep out of the joint. Ultraviolet light from the sun breaks down many elastomers, weakening the seal. Ozone can crack rubbery gaskets, especially under stress. Dirt and oil on the gasket surface can cause chemical interaction or hinder proper sealing, and they can contribute to wear. Together, these factors cover the most common ways gaskets are ruined, which is why this option is the best fit. Water or moisture by itself is less destructive, and cold temperatures alone aren’t as damaging as heat and UV exposure. Abrasive water is a form of wear but doesn’t capture the broad range of factors as well as the listed combination.