Incandescent Filiment Support Prongs?
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Posted by C. Nick Kruzer on June 30, 2008, 7:29 am
Please log in for more thread options light bulb made of Nickel metal or some type of Nickel alloy? They look shiny like stainless steel. I've been using them as points in negative ion generator experiments. I'm wondering about the release of the small amounts, if any, of volatile metals into the surrounding breathable atmosphere. I've also played with the shiny prongs using them as small electrodes for water electrolysis with a 9v battery. Now that I've replaced all my household screw-in incandescent lights with compact fluorescent units I have been messing around with the rejected incandescent bulbs. Using a jeweler's saw I open the bulbs near the most distal portion of the electrical contact end. The internal components are then carefully removed. If you do this you should wear gloves and safety glasses/goggles. Glass chips will fly. (Reminder: Don't break open fluorescent bulbs, they contain mercury.) insula | ||||||||||||||||
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Posted by bud-- on June 30, 2008, 1:09 pm
Please log in for more thread options You could try asking at sci.engr.lighting It has some very smart people. From an old thread there, a couple opinions (not certain) were iron or nickel-plated iron molybdenum Might make a difference between center supports (on some lamps) and end supports. -- bud-- | ||||||||||||||||
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Posted by Bob Masta on July 1, 2008, 7:19 am
Please log in for more thread options On Mon, 30 Jun 2008 04:29:21 -0700, insula@webtv.net (C. Nick Kruzer)
wrote: >Are the filiment support prongs in an ordinary household incandescent
>light bulb made of Nickel metal or some type of Nickel alloy? > >They look shiny like stainless steel. > >I've been using them as points in negative ion generator experiments. >I'm wondering about the release of the small amounts, if any, of >volatile metals into the surrounding breathable atmosphere. > >I've also played with the shiny prongs using them as small electrodes >for water electrolysis with a 9v battery. > >Now that I've replaced all my household screw-in incandescent lights >with compact fluorescent units I have been messing around with the >rejected incandescent bulbs. > >Using a jeweler's saw I open the bulbs near the most distal portion of >the electrical contact end. The internal components are then carefully >removed. If you do this you should wear gloves and safety >glasses/goggles. Glass chips will fly. >(Reminder: Don't break open fluorescent bulbs, they contain mercury.) > Incandescent bulbs may be hazardous as well: Animal studies of tungsten shrapnel show that it is a very powerful carcinogen. I don't know how tungsten dust (which I assume must be inside the envelope after the filament burns out) would behave in the lungs, but I suspect the answer would be "not good". This may not be an environmental hazard like mercury in landfills, but on a personal experimenter basis it may be much worse. (My understanding is that mercury is a problem mostly in organically active forms like methyl mercury, not as a raw element.) Best regards, Bob Masta DAQARTA v4.00 Data AcQuisition And Real-Time Analysis www.daqarta.com Scope, Spectrum, Spectrogram, Sound Level Meter FREE Signal Generator Science with your sound card! | ||||||||||||||||
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Posted by Paul Carpenter on July 1, 2008, 8:48 am
Please log in for more thread options says...
> On Mon, 30 Jun 2008 04:29:21 -0700, insula@webtv.net (C. Nick Kruzer)
> wrote: > > >Are the filiment support prongs in an ordinary household incandescent
> >light bulb made of Nickel metal or some type of Nickel alloy? > > > >They look shiny like stainless steel. > > > >I've been using them as points in negative ion generator experiments. > >I'm wondering about the release of the small amounts, if any, of > >volatile metals into the surrounding breathable atmosphere. > > > >I've also played with the shiny prongs using them as small electrodes > >for water electrolysis with a 9v battery. > > > >Now that I've replaced all my household screw-in incandescent lights > >with compact fluorescent units I have been messing around with the > >rejected incandescent bulbs. > > > >Using a jeweler's saw I open the bulbs near the most distal portion of > >the electrical contact end. The internal components are then carefully > >removed. If you do this you should wear gloves and safety > >glasses/goggles. Glass chips will fly. > >(Reminder: Don't break open fluorescent bulbs, they contain mercury.) All sorts of phosphors on the inside of the glass as well. > Incandescent bulbs may be hazardous as well: Animal studies of
> tungsten shrapnel show that it is a very powerful carcinogen. I don't > know how tungsten dust (which I assume must be inside the envelope > after the filament burns out) would behave in the lungs, but I suspect > the answer would be "not good". Considering the original quantity of tungsten, and distribution of 'shrapnel', you have a low probability of ingest (stomach/lungs) enough tungsten to be more than a minor irritant. From recollection it is difficult to absorb tungsten through skin contact. In this case the poster referes to GOOD bulbs not burnt out ones, and trying not to smash the glass. So the shrapnel is minimised. More likely to have dust problems with types of bulbs that are internally coated with phospors. > This may not be an environmental hazard like mercury in landfills, but
> on a personal experimenter basis it may be much worse. (My > understanding is that mercury is a problem mostly in organically > active forms like methyl mercury, not as a raw element.) As a raw element at room temperature it will form a gaseoues mercury vapour and some Mercury Oxide that can easily be breathed in, often seen looking like a heat haze above raw mercury. What quantities you should worry about I have no idea. Any heating of mercury is always suggest to be done in VERY well ventilated areas. Methylmercury is usually created by bacterias reacting with mercury, there are many different types of bacteria on and in our bodies. Heating Mercury Oxide to a fairly high temperature decomposes the solid form back to mercury and oxygen (see Preistley's experiments often hailed as the discovery of oxygen). This is one method used to refine Mercury from some types of ore. Mercury can be absorbed through the skin http://www.npi.gov.au/database/substance-info/profiles/53.html http://msds.chem.ox.ac.uk/ME/mercury_II_oxide.html To think this element was used for cosmetic and HEALTH giving properties for thousand of years and gave rise to the expression "As mad as a hatter" Lots of lighthouses use a bed of mercury for the load bearing of the rotating lenses for the lights. These places are usually well ventilated! Nearly all fluorescents have phospor coatings on the inside of the tubes also very nasty in dust form. -- Paul Carpenter | paul@pcserviceselectronics.co.uk <http://www.pcserviceselectronics.co.uk/> PC Services
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Posted by John Fields on July 1, 2008, 9:39 am
Please log in for more thread options On Tue, 1 Jul 2008 13:48:57 +0100, Paul Carpenter
>Nearly all fluorescents have phospor coatings on the inside of the tubes
>also very nasty in dust form. --- http://www.geconsumerandindustrial.com/environmentalinfo/documents/msds/msds_fluorescent_lamps.pdf JF | ||||||||||||||||
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> Are the filiment support prongs in an ordinary household incandescent
> light bulb made of Nickel metal or some type of Nickel alloy?
>
> They look shiny like stainless steel.