Which item’s shelf life is twenty years?

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

Answer: (A)

Shelf life is the period a seal material is expected to remain usable in storage before its properties degrade. Viton O-rings, made from fluorocarbon elastomer (FKM), have excellent chemical resistance, thermal stability, and low permeability, so they age very slowly while stored. That combination allows a twenty-year storage window when kept in proper conditions (cool, dry, out of direct sunlight, in original packaging). Other common elastomer seals don’t typically share that level of long-term stability under standard storage; generic O-rings may be made from materials that age faster, V-rings and gaskets vary widely in composition and construction, and their storage lifespans aren’t specified to twenty years. So the Viton O-ring is the best fit for a twenty-year shelf life.