10.32 Do CDs deteriorate with time? What is their life span?
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This article is from the rec.audio.* FAQ, by with numerous contributions by Bob Neidorff others.
10.32 Do CDs deteriorate with time? What is their life span?
A CD consists of a polycarbonate top layer, an aluminum (or
gold) metal reflective layer, a polycarbonate bottom layer,
and some miscellaneous printing ink. Of these materials,
polycarbonate seems to be extremely stable with time provided
that it is well cared for. Do not use any liquids on a CD
that contain silicones or solvents. Do not leave CDs in
sunlight or other bright light. Do not stick labels on CDs.
Do not write on CDs. Do not expose CDs to temperatures higher
than normal room temperatures. Don't leave a CD under water.
Even the top side of a CD is critical and subject to damage.
Some pressings from the early 1980s used ink which damaged the
polycarbonate top layer and eventually got into the aluminum.
These inks are not in use today. Some earlier discs were made
with imperfect sealing around the perimeter of the disc. This
was evident because the aluminum in the disc extended all of
the way to the disc edge. These discs were known to fail due
to moisture getting to the aluminum and causing it to oxidize.
Modern CD factories have solved this problem as well.
With those cautions, modern CDs will last for more than 30
years without deterioration. Most of the CDs which were
made in 1983 are still around today and still sound good.
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