The Microwaved CD-ROM Experiment
Starting at 1:34am on Saturday, November 2, 2002, 28 CD-ROMs and CDRs were exposed to short bursts of microwave radiation. The purpose of this experiment was to observe the electrical spark activity on the foil surfaces of the discs, and the resulting patterns left in the foil after exposure. Several of the resulting test CD-ROMs were then scanned to document the variations in pattern.
Equipment Specifications:
Microwave Power: 800 Watts
Microwave Frequency: 2450 MHz
Exposure Time: 5 seconds
Microwave Oven Manufacturer: Goldstar
A Word on Experimental Procedure:
The exposure time, five seconds, was determined by trial-and-error. In general, at the indicated microwave power level, a minimum exposure time of approximately two seconds is required before any results (travelling sparks, etc.) are seen. The spark reaction itself tends to be very quick, lasting only two to three seconds. Following that, hot spots form at a various points. These areas quickly heat to white hot, and begin to melt the polycarbonate plastic substrate. In a matter of seconds, the melting plastic releases noxious fumes, and becomes a fire and smoke hazard. It seems likely that this process will only become more rapid with more powerful microwave ovens (modern microwave ovens are usually 1000 Watts or larger). As such, it is important to only irradiate test CD-ROMs for a few seconds (five or less), lest a hazardous condition result. All experiments should be closely monitored by a responsible adult well acquainted with the microwave oven in question.
Observations
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