Neon signs can last many years.
Neon signs can last up to 50 years, although most last 20 to 25 years. Several factors contribute to the signs' lifespan.
History
French chemist Georges Claude patented the neon sign---a glass tube filled with neon gas that glowed red when electrified---in 1915.
Misconception
The term "neon sign" refers to the technology of lit, gas-filled tubes rather than neon gas itself because argon gas and other elements are necessary to create colors other than red.
Technology
Neon signs are made by bending hollow glass tubes into the shapes of letters and pictures, filling the tubes with gas, sealing the ends and wiring the tubes to be connected to electricity.
Failure
Neon signs eventually fail due to faults in the glass or wiring. The gas inside does not wear out or otherwise cause problems; if the surrounding system were foolproof, the neon signs could remain lit forever.
Problems
Common problems with neon signs include cracked or broken glass through which the gas can escape, pumping too much gas into the tube during production and failed electrodes or transponders.
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