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Old 11-29-2009, 09:55 PM   #1
slouch
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Default Galvanized Steel

Thought I would throw this out for either confirmation or warning.

I needed a new fitting for my Star San tank, and went to Home Depot to pick one up. The guy helping me had a PhD in environmental engineering, and let me know that when galvanized fittings start breaking down the release a form of cyanide.

Needless to say I steered clear, and spent the $2 more for brass. I have brass everywhere else. Have tried plastic, but it leaked. Since galvanized is ruled out it looks like brass or steel for valves from here on out.



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Old 12-01-2009, 02:40 PM   #2
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Galvanized is great for natural gas lines, but not so good for stuff equipment that touches food and beer!



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Old 12-01-2009, 02:59 PM   #3
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Quote:
Originally Posted by slouch View Post
I went to Home Depot. The guy helping me had a PhD in environmental engineering.
Wow, rough economy.
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Old 12-01-2009, 03:10 PM   #4
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Originally Posted by slouch View Post
. The guy helping me had a PhD in environmental engineering, and let me know that when galvanized fittings start breaking down the release a form of cyanide.
Apparently that guy failed his chemistry course in an EPIC fashion. There is no cyanide in steel. Hell, there is no nitrogen that could possibly form cyanide. Zinc is the major concern with galvanized steel products. Excess zinc can severely interfere with the way your body functions.
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Old 12-01-2009, 03:13 PM   #5
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Quote:
Originally Posted by slouch View Post
Thought I would throw this out for either confirmation or warning.

I needed a new fitting for my Star San tank, and went to Home Depot to pick one up. The guy helping me had a PhD in environmental engineering, and let me know that when galvanized fittings start breaking down the release a form of cyanide.

Needless to say I steered clear, and spent the $2 more for brass. I have brass everywhere else. Have tried plastic, but it leaked. Since galvanized is ruled out it looks like brass or steel for valves from here on out.
I can't find any confirmation about galvanized steel releasing cyanide. I did however find some info that says galvanized steel in contact with "acidic" foods can cause the release of zinc salts. Witch can lead to minor zinc poisoning.

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Old 12-01-2009, 03:14 PM   #6
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Quote:
Originally Posted by Rushis View Post
Apparently that guy failed his chemistry course in an EPIC fashion. There is no cyanide in steel. Hell, there is no nitrogen that could possibly form cyanide. Zinc is the major concern with galvanized steel products. Excess zinc can severely interfere with the way your body functions.
On that one you are beyond me. I didn't fail may chemistry classes in college... because I never took them.

Either way, cyanide, zinc, or some other decomposition of the product, I decided to stay away from it, in favor of brass and stainless.
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Old 12-01-2009, 03:18 PM   #7
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I decided to stay away from it, in favor of brass and stainless.
Queue the "but brass had lead in it" guys in 5...4...3...2...
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Old 12-01-2009, 03:29 PM   #8
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I'd still avoid galvanized steel in your brewing. I know welding it can be deadly without ventilation. I used some galvanized fence posts to build my brew tree, though.

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Old 12-01-2009, 04:51 PM   #9
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Wow, rough economy.
Yeah that is what I thought, till I found out he was retired from California living here for the lifestyle. We have a lot of those.

I had neighbors once that worked at Home Depot. The sold their 30 year old 800 foot 2 bedroom condo in SoCal for over a mil, and move into a new 5000 foot custom built home for 300k. Working at HD and living off of the rest.

So they all got out of Caly when the $$ was still good.
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Old 12-01-2009, 05:12 PM   #10
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I've been selling metals for years now and can tell you that ALL food manufactureres use either a 304 stainless or 316 stainless in there equipment. With acidic liquids 316 is preferred.

Galvanized contains no cyanide, does not produce cyanide, doesn't know what cyanide is. Galvanized shouldn't be used because it does "rust". If you've ever seen a piece of galv that has been sitting out in the rain it looks white. That is zinc oxide. The zinc oxide will flake off into what ever is there. Not very sanitary.

Before anyone says it yes stainless oxidizes too but the nickle oxide does not flake off and if you scratch it off it will instantly reform.



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