Which item has a shelf life of 3 years?

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

Answer: (D)

Shelf life is the period a packaged elastomer part can be stored under specified conditions before its performance may be affected. Elastomers age through oxidation and hardening, so manufacturers set a time limit to help ensure reliability when the part is eventually used.

V-rings are typically assigned a three-year shelf life in many ALRE maintenance references. This reflects their aging characteristics and the recommended stock rotation for these seals, rather than the actual service life once installed. Other items like Viton O-rings or generic O-rings can have longer shelf lives if stored properly, since material chemistry (Viton's resistance) and packaging conditions influence aging differently. Gaskets vary by material and construction, so their shelf life isn’t a fixed three-year value in the same way.

Remember, shelf life refers to storage suitability, not how long the part will last in service. Store in original packaging, cool and dry, away from heat and ozone, and rotate stock to maintain readiness.