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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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ok to use Araldite Rapid on 500W quartz bulb?
On Mon, 22 Nov 2004 08:02:26 GMT, Zak strung
together this: I have repaired it with Araldite Rapid. I wouldn't even entertain the idea of repairing it. Buy a new one, WW2 has finished now. -- SJW A.C.S. Ltd Please reply to group or use 'usenet' in email subject |
#2
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Zak wrote:
The ceramic end on the 500W bulb in my quartz halogen floodlight has cracked. I have repaired it with Araldite Rapid. Will the temperature of the bulb be too much for the adhesive? I have a feeling that Araldite can not be used at very high temps but can't find a Google reference which gives any real information. No glue will sucessfully stick your bulb back together permanently. -- Grunff |
#3
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"Zak" wrote in message ... The ceramic end on the 500W bulb in my quartz halogen floodlight has cracked. I have repaired it with Araldite Rapid. Will the temperature of the bulb be too much for the adhesive? I have a feeling that Araldite can not be used at very high temps but can't find a Google reference which gives any real information. these bulbs are only 50p each from screwfix, it cannot be worth the aggravation of attempting anything more than clean the contacts in the way of maintenance. mrcheerful |
#4
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The ceramic end on the 500W bulb in my quartz halogen floodlight has
cracked. I have repaired it with Araldite Rapid. In all my time, I've never heard of someone attempting to fix a light bulb. Unless you are based in South Georgia or Tristan da Cunha, buy a new bulb, it will be cheaper than the Araldite. Christian. |
#5
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"Zak" wrote in message ... The ceramic end on the 500W bulb in my quartz halogen floodlight has cracked. I have repaired it with Araldite Rapid. snip This has got to be a troll. |
#6
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"Zak" wrote in message ... The ceramic end on the 500W bulb in my quartz halogen floodlight has cracked. I have repaired it with Araldite Rapid. Will the temperature of the bulb be too much for the adhesive? Almost certainly it will probably catch fire :-( I really don't see the logic of pratting about like that for a £1-50 lamp |
#7
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don't know if i will be the only one to attempt to answer your question
rather than pass comment, but i doubt the glue will hold up to the extreme temperatures the bulb produces...why not try it and see? in fact you probably have done by now...did it work? Steve |
#8
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On Mon, 22 Nov 2004 18:48:06 -0000, "r.p.mcmurphy"
strung together this: don't know if i will be the only one to attempt to answer your question well, if you read the whole thread first you'd notice that you are in fact the second person to post a answer to the question rather than an alternative method. -- SJW A.C.S. Ltd Please reply to group or use 'usenet' in email subject |
#9
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Lurch wrote in message . ..
On Mon, 22 Nov 2004 18:48:06 -0000, "r.p.mcmurphy" strung together this: don't know if i will be the only one to attempt to answer your question well, if you read the whole thread first you'd notice that you are in fact the second person to post a answer to the question rather than an alternative method. a crack will let air in, result: instant filament failure. araldite hasnt got the remotest chance of surviving the temp. To repair it youll need to be able to weld the quartz, and do so while the bulb is in a semi vacuum with bromine or iodine added. Halogens are about the least repairable of all bulb types. NT |
#11
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On Tue, 23 Nov 2004 14:53:30 -0000, Rob Morley
strung together this: It's not the envelope that's cracked. Either way, it's a stupid idea to repair a halogen tube. -- SJW A.C.S. Ltd Please reply to group or use 'usenet' in email subject |
#12
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Rob Morley wrote in message et...
In article , "N. Thornton" says... a crack will let air in, result: instant filament failure. araldite hasnt got the remotest chance of surviving the temp. It's not the envelope that's cracked. AFAIK there isnt anything else on a 500w halogen bulb that could crack. NT |
#13
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"Lurch" wrote in message ... On Mon, 22 Nov 2004 18:48:06 -0000, "r.p.mcmurphy" strung together this: don't know if i will be the only one to attempt to answer your question well, if you read the whole thread first you'd notice that you are in fact the second person to post a answer to the question rather than an alternative method. actually i did read the whole thread and not one answered the op's question. Steve |
#14
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On Tue, 23 Nov 2004 20:41:54 -0000, "r.p.mcmurphy"
strung together this: actually i did read the whole thread and not one answered the op's question. You've obviously got some missing posts then, I can see another that answers the question quite clearly here. -- SJW A.C.S. Ltd Please reply to group or use 'usenet' in email subject |
#15
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"Lurch" wrote in message news On Tue, 23 Nov 2004 20:41:54 -0000, "r.p.mcmurphy" strung together this: actually i did read the whole thread and not one answered the op's question. You've obviously got some missing posts then, I can see another that answers the question quite clearly here. -- SJW A.C.S. Ltd Please reply to group or use 'usenet' in email subject Oh well. but it seems that so many just want to make comment rather than answer questions sometimes! Steve |
#16
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In uk.d-i-y Zak wrote:
The ceramic end on the 500W bulb in my quartz halogen floodlight has cracked. I have repaired it with Araldite Rapid. Will the temperature of the bulb be too much for the adhesive? I have a feeling that Araldite can not be used at very high temps but can't find a Google reference which gives any real information. It will fail. I would wrap it in wire, to keep it together when it fails. But expect to need to replace. |
#17
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"Zak" wrote: The ceramic end on the 500W bulb in my quartz halogen floodlight has=20 cracked. =20 I have repaired it with Araldite Rapid. =20 Will the temperature of the bulb be too much for the adhesive? =20 I have a feeling that Araldite can not be used at very high temps but=20 can't find a Google reference which gives any real information You could also use Duct Tape (Gaffer Tape) - the high temp version. :-). I do recall a high temp "dope" for sealing up vacuum system (OK to about 10^-5 Torr, I think). Sealed holes in glass and was flexible enough to handle temp variations without losing seal.=20 Can't remember what it was called. Tomasso. |
#18
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Tomasso wrote:
"Zak" wrote: The ceramic end on the 500W bulb in my quartz halogen floodlight has cracked. I have repaired it with Araldite Rapid. Will the temperature of the bulb be too much for the adhesive? I have a feeling that Araldite can not be used at very high temps but can't find a Google reference which gives any real information You could also use Duct Tape (Gaffer Tape) - the high temp version. :-). I do recall a high temp "dope" for sealing up vacuum system (OK to about 10^-5 Torr, I think). Sealed holes in glass and was flexible enough to handle temp variations without losing seal. Can't remember what it was called. Glyptal thermoset resin (phtalic anhydride, glycerin, red pigment...). -- Uncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/qz.pdf |
#19
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Uncle Al wrote:
Tomasso wrote: "Zak" wrote: The ceramic end on the 500W bulb in my quartz halogen floodlight has cracked. I have repaired it with Araldite Rapid. Will the temperature of the bulb be too much for the adhesive? I have a feeling that Araldite can not be used at very high temps but can't find a Google reference which gives any real information You could also use Duct Tape (Gaffer Tape) - the high temp version. :-). I do recall a high temp "dope" for sealing up vacuum system (OK to about 10^-5 Torr, I think). Sealed holes in glass and was flexible enough to handle temp variations without losing seal. Can't remember what it was called. Glyptal thermoset resin (phtalic anhydride, glycerin, red pigment...). You are showing your age. Glyptal went out about 1970. The two sealants of choice are Torr-Seal (Varian) or equivalent, an epoxy which goes to 10^-9 Torr and ~ 120 C, or silicone based resins that you can use (with luck) to 450 C The former have structural strength. The latter are strictly paint on and the replacements for glyptal (I remember glyptol, but that could be age). josh halpern |
#20
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"Joshua Halpern" wrote: ...or silicone based resins that you can use (with luck) to 450 C =20 ...strictly paint on and the replacements for glyptal=20 The silicone one is the one I remember. For reasons that REALLY make no sense to me now, I had to thermally decompose sodium azide (NaN3) under high vacuum... Even in those days I was a theoretician, but for some reason got tied up in this weird system (optical pumping Na Zeeman hyperfine - primitive, but was able to vary a lot of conditions).=20 I may be showing my age, too. Tomasso. |
#21
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"Zak" wrote:
The ceramic end on the 500W bulb in my quartz halogen floodlight has cracked. I have repaired it with Araldite Rapid. Will the temperature of the bulb be too much for the adhesive? I have a feeling that Araldite can not be used at very high temps but can't find a Google reference which gives any real information Aradite rapid joins can be pulled apart by heating to 150C. Standard aradite is much stronger w.r.t heat. -- -- Ron Jones Don't repeat history, see unreported near misses in chemical lab/plant at http://www.crhf.org.uk |
#22
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"Ron Jones" wrote in message ...
Aradite rapid joins can be pulled apart by heating to 150C. Standard aradite is much stronger w.r.t heat. JAAMOI, are Standard and Rapid of similar strengths at, say, -5C to 40C? I've often wondered, and used standard where strength is an issue, 'just in case'. Regards, Paul. |
#23
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Paul wrote:
"Ron Jones" wrote in message ... Aradite rapid joins can be pulled apart by heating to 150C. Standard aradite is much stronger w.r.t heat. JAAMOI, are Standard and Rapid of similar strengths at, say, -5C to 40C? I've often wondered, and used standard where strength is an issue, 'just in case'. Regards, Paul. Personally, I've usually found the Standard is better - so long as you can properly secure the mend for the full setting time of 3 days!! -- -- Ron Jones Don't repeat history, see unreported near misses in chemical lab/plant at http://www.crhf.org.uk |
#24
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On Mon, 22 Nov 2004 08:02:26 GMT, Zak wrote:
The ceramic end on the 500W bulb in my quartz halogen floodlight has cracked. I have repaired it with Araldite Rapid. Will the temperature of the bulb be too much for the adhesive? I have a feeling that Araldite can not be used at very high temps but can't find a Google reference which gives any real information. Hi, Try baking it in the oven for a while, then check the strength of the bond while it's hot. I've got a feeling that the heat may soften the epoxy too much, if it does then fire cement or superglue could be better alternatives. cheers, Pete. |
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