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Mophat
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Join Date: Jan 2010
Posts: 9

Chemical Cleanser

01/15/2010 1:00 PM

Hi Guys,

The mixture is:

1:1:5 ---- H2O2(30%) : NH4OH(29%) : H2O(18M Ohm DI water)

I am interested in the pH of the products, potential Off gases and any hazards that may be associated with the mixture. If anyone can help that would fantastic, and if you require more info let me know. Thanks!
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Anonymous Poster
#1

Re: Chemical mix produces?

01/15/2010 1:59 PM

We do not help people who want to make bombs.
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Mophat
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Join Date: Jan 2010
Posts: 9
#2
In reply to #1

Re: Chemical mix produces?

01/15/2010 2:01 PM

its not a bomb at all...its for cleaning a Sapphire wafer for the semiconductor industry
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aurizon
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#3
In reply to #2

Re: Chemical mix produces?

01/15/2010 11:16 PM

well, 18 M double de-ionized water will conduct a lot with ammonia added.

Is it what we call 30 volume hydrogen peroxide or indeed 30% H2O2?

30 volume is fairly benign, being a common antiseptic and bleach.

30% can decompose quite violently.

In any event, cleaning wafers is a mature technology and cleaners can be bought for a little more than the cost of making them. Do you for some reason want to make it to avoid paying full price for it under the impression there is a lot of $$ to be saved by maiking it? Hint, do not buy supplies from the wafer machine makers, they treat them as cash cows. Find other suppliers. If the wafer machine makers whine about warranty, tell the police of they with-hold warranty or other service because you did not buy their supplies, just like it is not legal for Ford to insist you buy Ford gas.

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wcfloyd
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#4

Re: Chemical Cleanser

01/16/2010 5:43 AM

I would imagine this mixture will have a pH of 12 or higher, and have a strong odor of ammonia. Off-gases will be ammonia. Alkaline peroxide is a strong oxidizing agent. H2O2 can react with amines to make amine oxides, but I'm not sure what it will do with ammonia. Wear rubber gloves, safety glasses/goggles and an apron. Add the ammonia to the water slowly and add the H2O2 slowly to that. Expect it to get hot and maybe splatter. Have it stirring when you add things.

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Mophat
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Join Date: Jan 2010
Posts: 9
#7
In reply to #4

Re: Chemical Cleanser

01/20/2010 1:24 PM

My original information was incorrect.

The solution concentration will be 1:1:100 not 1:1:5 which I imagine will decrease the pH and "hostility" of this mixture. Sorry for the inconvience
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kevinm
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#5

Re: Chemical Cleanser

01/17/2010 6:23 PM

You may want to check with a company like Solvay Interox and if high pH is not required then consider using sodium percarbonate. It is safer and no off-gassing. It is used in a lot of applications for cleaning (laundry, deck cleaning, wellrific, even in electronic industry, etc). High pH may be required if SO4 is involved and thus your ammonium hydroxide recipe. Solvay should be able to supply chemicals and provide an excellent technical support with knowledgeable staff. FMC is a good alternate. Just google them lots of info available.

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Mophat
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Join Date: Jan 2010
Posts: 9
#6

Re: Chemical Cleanser

01/19/2010 2:01 PM

Thanks for the info. Just for clarification, a new peice of cleaning equipment uses this process so I am tryin to decide on the output plumbing and if this needs to be neutralized etc. Once again thanks to all the helpful comments
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Users who posted comments:

Anonymous Poster (1); aurizon (1); kevinm (1); Mophat (3); wcfloyd (1)

Previous in Forum: Neutralizing 98% Sulfuric Acid   Next in Forum: WS2 solid lubricant
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