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Published online by Cambridge University Press: 14 March 2018
The recordable compact disc (CDR) is a popular and inexpensive medium for storing and disseminating digital information, such as micrographs and scanned images. This technical note describes unusual degradation that rendered a group of discs unreadable. The discs were purchased as a set. Each disc was packaged in a jewel box and wrapped in clear plastic. Several of the discs were used within weeks of purchase to store data, which included digital micrographs.
1. The manufacturer will not be named. The color of the lacquered surface is silver.
2. The crystals appeared as dense radiates and arced clusters within the blue dye line and the stacking ring.
3. Alcohols dissolve bisphenoi-A, but may induce cracking in the polycarbonate surface that could interfere with data retrieval.
4. Thirty-two sample and background scans were collected at 4 wavenumber resolution using Happ-Genzel apodization.
5. 2,2-bis (4-hydroxyphenoi)-propane.
6. The author thanks Chad Mistele (Lexan QO Product Developer, GE Plastics, Mt. Vernon, IN) for sharing his expertise on polycarbonates.
7. Hydrolysis is produced experimentally using a standard hydrolytic test (80° C and 85% RH).
8. Two scenarios were described: (1) contact with a solvent that was slightly basic, such as softened tap water, and (2) in the case of spindled discs, contact with ink from a printed label that contained an organic base.
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