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Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.

Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.

2014-04-05 by <beefyzee@...>

Just thought I'd share my experience with the following.

Mixed 200ml of 30% builders hydrochloric acid with about 70ml of 35% hydrogen peroxide and etched my board. Did not dilute with water. Very fast etching, under 2 minutes, and a nice board. Afterwards the mixture is fizzing and bubbling away like something a mad scientist made in his laboratory. I reckon I could have used much less of both ingredients and reduced the amount of H2O2. If it was way too strong, there were no adverse effects on the etching or the board, and the resist did not get eaten away (pre-sensitised Kinsten board for the UV process).

Got the 35% H2O2 from a chemical supplier I found on Google. Have heard mixed stories about the 3% stuff you get out of the supermarket. I tried it a few months ago and nothing happened, but with this 35% stuff, rocket fuel. The supplier gave it to me with the plastic bottle completely wrapped in foil to keep the light off it. He told me to keep it in the fridge too. These two measures he said would make it last a long time. Even if some of it's 35% strength decays, I'll still be left with plenty concentration compared to the 3% stuff.

Got to do it outside, preferably with a bit of wind so you aren't getting the fumes up your nose. And don't let the acid fumes get near any metal that you don't want to go rusty. Last but not least, goggles, gloves and a bucket of water just in case you get a splash.

I'm going to toss my ammonium persulphate now, I have risen to a new level LOL.

Re: [Homebrew_PCBs] Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.

2014-04-05 by søren hansen

Pictures please. :-D

Den 05/04/2014 09.47 skrev <beefyzee@...>:
Show quoted textHide quoted text

Just thought I'd share my experience with the following.

Mixed 200ml of 30% builders hydrochloric acid with about 70ml of 35% hydrogen peroxide and etched my board. Did not dilute with water. Very fast etching, under 2 minutes, and a nice board. Afterwards the mixture is fizzing and bubbling away like something a mad scientist made in his laboratory. I reckon I could have used much less of both ingredients and reduced the amount of H2O2. If it was way too strong, there were no adverse effects on the etching or the board, and the resist did not get eaten away (pre-sensitised Kinsten board for the UV process).

Got the 35% H2O2 from a chemical supplier I found on Google. Have heard mixed stories about the 3% stuff you get out of the supermarket. I tried it a few months ago and nothing happened, but with this 35% stuff, rocket fuel. The supplier gave it to me with the plastic bottle completely wrapped in foil to keep the light off it. He told me to keep it in the fridge too. These two measures he said would make it last a long time. Even if some of it's 35% strength decays, I'll still be left with plenty concentration compared to the 3% stuff.

Got to do it outside, preferably with a bit of wind so you aren't getting the fumes up your nose. And don't let the acid fumes get near any metal that you don't want to go rusty. Last but not least, goggles, gloves and a bucket of water just in case you get a splash.

I'm going to toss my ammonium persulphate now, I have risen to a new level LOL.

Re: [Homebrew_PCBs] Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.

2014-04-05 by James

Yep, works great, I also use 35% H202. Don't throw the used etchant out, just add a little H202 every time you etch to regenerate it - I use about 1 cap in 500ml of etchant and that's overdoing it, pour in the cap of H202, stir, add board.

Top it up with a little acid now and then.

Dilute it down until it's just below the fuming point, makes it much more pleasant to work with and doesn't affect the performance.

No need to be very exacting about it.

On 05/04/14 20:46, beefyzee@... wrote:
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Just thought I'd share my experience with the following.


Re: Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.

2014-04-06 by <beefyzee@...>

Roger,

I've got your post in my email but it's not showing here in the forum yet.

Anyway the supplier is:

ANPROS PTY LTD
Factory 16
15 Macquarie Place
Boronia
VIC 3155

email info@...
tel 97209514

Prices at the time I bought

0.5 litre $22
1.0 litre $34
2.5 litre $55

Call and order then when you go there he'll have it ready for you, all wrapped up in silver foil. Get it straight in the fridge when you get home. I noticed the 0.5 litre bottles are black on the brochure. If you can get hold of black plastic containers that may be better than a clear bottle wrapped in foil.

Check out hair salon supplies too. I've heard a few times they use the same concentration H2O2 for doing hairdo stuff.

Keith.

Re: [Homebrew_PCBs] Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.

2014-04-07 by Misc Clark

Greetings! Your results sound impressive! Is 35% FOOD GRADE peroxide the same as the chemical you use? I see food grade is readily available...
Thanks, and keep us informed about your successes...
Clark Cone


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On Mon, Apr 7, 2014 at 5:25 AM, <beefyzee@...> wrote:

As per your request I've created a new album "Beefys Stuff" and put a couple of pictures of the board there. It's hard to get a good photo at night time with just the house lights, they either create reflections or shadows. Hope they are OK.


Keith.


Re: [Homebrew_PCBs] Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.

2014-04-07 by Mark Lerman


You can also get high percentage hydrogen peroxide at beauty supply shops in the US. It's very inexpensive.

Mark

At 08:30 AM 4/7/2014, you wrote:


Show quoted textHide quoted text
Greetings! Your results sound impressive! Is 35% FOOD GRADE peroxide the same as the chemical you use? I see food grade is readily available...
Thanks, and keep us informed about your successes...
Clark Cone


On Mon, Apr 7, 2014 at 5:25 AM, <beefyzee@... > wrote:


As per your request I've created a new album "Beefys Stuff" and put a couple of pictures of the board there. It's hard to get a good photo at night time with just the house lights, they either create reflections or shadows. Hope they are OK.

Keith.




Re: [Homebrew_PCBs] Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.

2014-04-07 by Mark Lerman



To make that clearer, I mean places that sell to beauty parlors. Most will sell to individuals, though some require buyer to be a licensed beautician.


At 10:22 AM 4/7/2014, you wrote:



Show quoted textHide quoted text
You can also get high percentage hydrogen peroxide at beauty supply shops in the US. It's very inexpensive.

Mark

At 08:30 AM 4/7/2014, you wrote:


Greetings! Your results sound impressive! Is 35% FOOD GRADE peroxide the same as the chemical you use? I see food grade is readily available...
Thanks, and keep us informed about your successes...
Clark Cone


On Mon, Apr 7, 2014 at 5:25 AM, <beefyzee@... > wrote:
As per your request I've created a new album "Beefys Stuff" and put a couple of pictures of the board there. It's hard to get a good photo at night time with just the house lights, they either create reflections or shadows. Hope they are OK.
Keith.





Re: [Homebrew_PCBs] Re: Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.

2014-04-07 by Peter Johansson


On Mon, Apr 7, 2014 at 9:24 AM, <npublici@...> wrote:

> 'Beauty shop suppliers,like "Sally's carry high percentage peroxide, also.I use it to remove bloodstains from clothing.40 0/0 will remove stains without harming the fabric,using just a drop..

I just googled and there is a Sally's right across the street from walmart where I was going to get some fresh 3% H2O2. Is there a specific product to ask for? What is the cost and percentage of H2O2?

-p.

Re: [Homebrew_PCBs] Re: Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.

2014-04-07 by Peter Johansson

On Mon, Apr 7, 2014 at 1:54 PM, Peter Johansson <rockets4kids@...> wrote:
>
> On Mon, Apr 7, 2014 at 9:24 AM, <npublici@...> wrote:
>
>> 'Beauty shop suppliers,like "Sally's carry high percentage peroxide,
>> also.I use it to remove bloodstains from clothing.40 0/0 will remove stains
>> without harming the fabric,using just a drop..
>
> I just googled and there is a Sally's right across the street from walmart
> where I was going to get some fresh 3% H2O2. Is there a specific product to
> ask for? What is the cost and percentage of H2O2?

I think I have answered my own question here:

http://www.using-hydrogen-peroxide.com/hairdressing-peroxide.html

It seems as if the "40% volume" is the cheapest way to add oxygen, and
may actually be cheaper than using 3% medical stuff.

-p.

Re: [Homebrew_PCBs] Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.

2014-04-08 by <leeleduc@...>

I find that 9% Peroxide (30 Volume Clear Developer) is a good strength to use. The 27% is too aggressive for me. I can etch a 2X4 inch, 1 ounce board in about 1 minute using 9% H2O2 and a foam paint brush.

Where to buy Peroxide in the US.
Available from Beauty supply shop such as Sally Beauty Supply
10 Volume Clear Developer = 3% Peroxide
20 Volume Clear Developer = 6% Peroxide
30 Volume Clear Developer = 9% Peroxide
40 Volume Clear Developer = 12% Peroxide

BAQUACIL Oxidizer from pool supply store =27% Peroxide

Re: [Homebrew_PCBs] Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.

2014-04-10 by <leeleduc@...>

I use the standard 1 part HCL to 2 parts H2O2. I place the board face up in a shallow glass or plastic container and mix up enough etchant to submerse the board in about 1/4 inch of solution. The etchant is at room temperature. I gently brush the board with a cheap foam paint brush until it's etched. Takes about a minute or so.

You can see the results in the "Photos" section titled "Dissolvo Paper Experiment"

Re: [Homebrew_PCBs] Re: Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.

2014-04-10 by Malcolm Parker-Lisberg

Now that is an impressive speed of etch, a bit aggressive though for 5 thou. tracks

Malcolm

I don't suffer from insanity I enjoy it!
Mene, mene, tekel, upharsin
The writing is on the wall.
Ha-ktovet al ha-kir

--------------------------------------------
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On Thu, 4/10/14, leeleduc@... <leeleduc@...> wrote:

Subject: [Homebrew_PCBs] Re: Tried Hydrochloric Acid + Hydrogen Peroxide for etching - fantastic.
To: Homebrew_PCBs@yahoogroups.com
Date: Thursday, April 10, 2014, 2:07 PM





Fast etch video

https://www.youtube.com/watch?v=OTGZcY7WyYI