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.
On Mon, 22 Nov 2004 08:02:26 GMT, Zak strung together this:
I wouldn't even entertain the idea of repairing it. Buy a new one, WW2 has finished now.
No glue will sucessfully stick your bulb back together permanently.
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
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.
This has got to be a troll.
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
Almost certainly it will probably catch fire :-(
I really don't see the logic of pratting about like that for a £1-50 lamp
It will fail. I would wrap it in wire, to keep it together when it fails. But expect to need to replace.
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.=20Can't remember what it was called.
Tomasso.
Glyptal thermoset resin (phtalic anhydride, glycerin, red pigment...).
On Mon, 22 Nov 2004 18:48:06 -0000, "r.p.mcmurphy" strung together this:
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.
Aradite rapid joins can be pulled apart by heating to >150C. Standard aradite is much stronger w.r.t heat.
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
It's not the envelope that's cracked.
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.
On Tue, 23 Nov 2004 14:53:30 -0000, Rob Morley strung together this:
Either way, it's a stupid idea to repair a halogen tube.
AFAIK there isnt anything else on a 500w halogen bulb that could crack.
NT
actually i did read the whole thread and not one answered the op's question.
Steve
Apart from the ceramic endy bits that the OP specifically said had cracked.
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