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Old 19th December 2002, 12:52 PM   #11
SY is offline SY  United States
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Ferric chloride is the best etchant. If you have trouble locating it, try using something like sodium perchlorate or ammonium perchlorate. What you want is a strongly oxidizing Lewis acid.
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Old 19th December 2002, 01:46 PM   #12
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Quote:
Originally posted by sikkek
Peranders,

I don't think he has H2O2 bleach, but some chloric bleach. I don't know how that will react when mixed with HCl.....
hacknet, don't use any fluids if you aren't sure what it is!

Known working fluids:

Ferric chloride, whatch out for stains on clothes!!!

Ammonium persulfat (in Swedish). White powder, gets blue when used. Equally good as FeCl3 but it's easier to solve in warm water, no gases either. I have used it a lot. Watch out for stains on cotton, bleaches!! Can also make holes!!

Peroxide + HCl + 3 parts of water = dangeruos but really effective. Watch out for stains, holes in your clothes!!!
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Old 19th December 2002, 02:05 PM   #13
AuroraB is offline AuroraB  Norway
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Default Usable etchants

Ferric chloride exists in two versions,-- FeCl3 and FeCl2. Only FeCl3 is usable as an etchant...
The trick about FeCl3 as an etchant is that is is reusable until the "soup" is saturated with copperchloride....then the etching time increases dramatically and finally halts.. it also needs to be heated to 45-50 deg. to be usable without very long process time...

Other usable etchants are Sodium sulphate and ammonium sulphate, both can be reusable but needs the same heating as FeCl3. Should be available at electronic suppliers. Both gives a transparent solution, whereas Ferric chloride is a mess and stains everything..

All the above etchants needs air, either by being sprayed or foamed. Submersion only don't work....

An alternative etchant is 50% strength hydrochloric acid, 50% hydrogen peroxide, and water, mixed in 1 : 1 : 2.
This is a one time solution that must be mixed immediately prior to use, and then disposed of. Cannot be stored ready made. Mix accurately, or you have no process or ultra fast , which gives too much underetching of the edges.
The process develops chlorine gas, so use well ventilated only...

Good luck
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Old 19th December 2002, 02:06 PM   #14
hacknet is offline hacknet  Singapore
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i got Cl bleach... i guess i can use it to bleach my school shoes.... bleach iz kinda acidic rite... cant i get it to work?
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Old 19th December 2002, 02:09 PM   #15
SY is offline SY  United States
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Small pedagogical point from a former chemistry teacher- FeCl2 is NOT ferric chloride.

The persulfates will work fine. IIRC, sodium persulfate is the fastest of the persulfate etchents.
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Old 19th December 2002, 02:11 PM   #16
hacknet is offline hacknet  Singapore
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can i boil off the bleach to make it more concentrated? i got 7 liters... help me get rid of it guys!!
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Old 19th December 2002, 02:12 PM   #17
hacknet is offline hacknet  Singapore
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i juz found a supplier dat sells fecl2... iz cheap but i need a licence from the ministry of environment before i can purchase the chemical!!! pcb etching is out of the window!!
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Old 19th December 2002, 02:18 PM   #18
AuroraB is offline AuroraB  Norway
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I stand to be corrected.... ,
but FeCl2 does exist, but is still not usable as an etchant...

For the Sodium an ammonium stuff, -they are both -persulphates...of course...

The HCl, H2O2 and water mixture is actually quite fast. I have often used it in "hurry" situations and for non critical work, when my etching machines where out of duty, for some reason or the other....
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Old 19th December 2002, 02:42 PM   #19
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Quote:
Originally posted by SY
Small pedagogical point from a former chemistry teacher- FeCl2 is NOT ferric chloride.

The persulfates will work fine. IIRC, sodium persulfate is the fastest of the persulfate etchents.
Don't we mean FeCl3?
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Old 19th December 2002, 02:47 PM   #20
Electrons are yellow and more is better!
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Quote:
Originally posted by hacknet
can i boil off the bleach to make it more concentrated? i got 7 liters... help me get rid of it guys!!
Forget it if you don't know what it is! If it is H2O2, no, you can't boil it!
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