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Toxins: Old CRTs may also have used toxic phosphors, although that is much less common today. An implosion or other breaking of the glass envelope could release these toxic phosphors. Because of the X-ray hazard, the glass envelopes of most modern CRTs are made from heavily leaded glass. The lead in this glass may represent an environmental hazard, especially in the presence of acid rain leaking through landfills. Indirectly-heated vacuum tubes (including CRTs) use Barium compounds and other reactive materials in the construction of the cathode and getter assemblies, normally this material will be converted into oxides upon exposure to the air, but care should be taken to avoid contact with the inside of all broken tubes. In some juristictions, all discarded CRTs are regarded as toxic waste.
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High voltage: CRTs operate at very high voltages. These voltages can persist long (several days) after the device containing the CRT has been switched off and unplugged. Residual charges of hundreds of volts can also remain in large capacitors in the power supply circuits of the device containing the CRT; these charges may persist for weeks. (Modern circuits contain bleeder resistors to ensure the high-voltage supply is discharged to safe levels within a couple of minutes at most.)
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Implosion: All CRTs and other vacuum tubes operate under negative pressure so that air and gas molecules will not interfere with electron streams. CRTs have large viewing areas and proportionally larger bells required to accommodate the deflection of the electron beams to the rear of the screen. As a result, these highly evacuated glass bulbs have a large surface area, with each and every square inch exposed to atmospheric pressure.
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So you are happy to present the bin men with a risk than make the effort to drive all of 15 miles to dispose of it safely? :wink: :P [of course thats presuming by old it is a CRT monitor]
Ok, seriously, monitors are not good environmentally to be just dumped. They can be a hazzard if not disposed of properly. Do the right thing and take it to the dump. Its only 15 miles not 150. :)
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