Which item has the middle shelf life value among the three items?

Which item has the middle shelf life value among the three items?

• A. V-ring
• B. Viton O-ring
• C. O-ring
• D. Gasket

Answer: (C)

To find the middle shelf life value, rank the items from shortest to longest storage life and pick the one in the middle. V-rings generally wear out or degrade more quickly in storage than typical elastomer seals, so they tend to have the shortest shelf life. Viton O-rings use a fluorocarbon elastomer with excellent aging resistance, giving them the longest shelf life. The standard O-ring usually sits between these two in terms of aging and stability, so its shelf life is the middle value. The gasket is a distractor in this set, not the middle in this comparison.

To find the middle shelf life value, rank the items from shortest to longest storage life and pick the one in the middle. V-rings generally wear out or degrade more quickly in storage than typical elastomer seals, so they tend to have the shortest shelf life. Viton O-rings use a fluorocarbon elastomer with excellent aging resistance, giving them the longest shelf life. The standard O-ring usually sits between these two in terms of aging and stability, so its shelf life is the middle value. The gasket is a distractor in this set, not the middle in this comparison.