A Perfect Dedome?

Putting a XP-G in gas oil for 24 hours works fine.

The dome did not fall off by itself though. What happened was that I thought it had not worked so when I took it out of the gas oil i poked the dome with my finger to feel if it had gone soft at all. It had not really but it just slid off!

I then sprayed the die with electro cleaner for a few seconds and that removed any gooey stuff that was left.

Initially worried that I might have broken the bonding wires with my thick fingers I hurried to test it out with a battery and it works.

Thank you very much to the OP and all others who have contributed to this thread and the knowledge we now have. TY! :-)

will the electronics cleaner do the de-doming i wonder?

No, they are made to not mess up plastics and similar stuff.

how about WD-40?

Very unlikely. WD-40 doesnā€™t attack silicone very well - if at all.

This stuff would probably do a great job. It dissolves Silicone amazingly fast.
http://www.techspray.com/download-tds-document.php?pId=153

At $35/pint plus hazmat it also dissolves your wallet contents amazingly fast. :wink:

I found here on a dutch forum that an electronics guy used petroleum-ether to remove silicone remains. I have some here where I work, I will give it a try. The composition is not far from gasoline, but it is much cleaner. It is even more equivalent to Coleman Fuel (which is also much cleaner than gasoline).

sounds like it is equivalent?

coleman fuel is pretty cheap around here (~$10-$12 a gallon). Which makes me wonder who pays $10 a quart for naptha (same thing different label).

its also a solvent/thinner for plasti-dip :stuck_out_tongue:

I doubt that it will work. It is a pretty mild solvent. Good on sticky residue from tape and tends not to harm most plastics. I use it for polishing plastics and LED display windows with red jewelers rouge.

I tried lacquer thinner the other day. Oddly enough (imo), it seemed to be less effective than acetone.

The petroleum-ether I have here says: 100-140Ā°C. I may have some Coleman Fuel as well somewhere. Perhaps when I can find some time and enough spare leds I will do a 'great dedome test string' one of these days..

It seems like it is not necessarily the most agressive solvent that works best on led-domes, I'll try it anyway .

Anybody de-domed an XRE? Same process?

Will the metal ring come off without damaging anything?

metal ring doesnā€™t come off with acetone.

good luck getting all the silicone out of the inside of the ring, and enjoy the ugly artifacts that the inside of the ring makesā€¦.

Iā€™ve done a few XRE and XRC, just grab the metal ring with a plier and pull/twist it off.

After, before soaking in gas, or instead?

I never had any luck with the XRE twist, always some bad residue left behind. And removing those always a mess. My success rate is only 33%, 1/3 - one ruined wire, one bluey, and one not-so-good-but-I-leave-it-alone-anyway-otherwise-rate-would-be-0/3ā€¦ heheh.

With petrol soak, the whole ring and dome just slid off. I have 100%, 1/1 success on this method for XRE. Best, cleanest result out of the four too.

LOL, Iā€™ve got a zoomie with that problem already from a thick hold down ring - the ring reflection is outside of the beam, but still wanting to paint it black.

No, Iā€™ve got a spare XRE and if I de-dome the ring will go even if that ruins the emitter.

I did them dry.
It was a while ago so I donā€™t think the gas trick had been invented :slight_smile:

Thanks guys. Think Iā€™ll try the soak first, then pull if needed.