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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details.

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Old 28th Feb 2023, 8:10 pm   #21
phildil
Pentode
 
Join Date: Sep 2014
Location: London, UK.
Posts: 113
Default Re: Disposal Of Sodium & Mercury Vapour Lamps

We have some mercury vapour lamps installed at work. They are 300w apiece and made by Philips. A few years ago I took a dozen dead lamps to a local recycling centre and carefully put them in the fluorescent lamps bin. At least, I thought I was being careful. As I walked away, I heard one fall and POP rather dramatically, so I presume they are pressurized.
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Old 1st Mar 2023, 12:23 pm   #22
broadgage
Nonode
 
Join Date: Jan 2010
Location: North Somerset, UK.
Posts: 2,129
Default Re: Disposal Of Sodium & Mercury Vapour Lamps

Mercury vapour lamps almost always have an inner arc tube containing a mixture of inert gas and mercury, this is contained within the much larger outer bulb that usually contains inert gas at half an atmosphere when cold and a little over atmospheric pressure when hot.
The outer bulb is commonly coated with fluorescent phosphor.

The outer bulb is easy to break, the inner arc tube is much stronger and likely survives being thrown into a refuse or recycling container.
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