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Old 09-28-2011, 04:46 PM   #381
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i use 70% isopropyl

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Old 09-29-2011, 07:42 PM   #382
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So as a software developer for Real-Time Analyzers (www.rta.biz) I was able to do some chemical analysis on samples of this delrin plastic mixer (from McMaster).

I decided to do a study on delrin in HCl (hydrochloric acid, a strong acid that should leech out chemicals), Starsan, Isopropyl, and Ethanol.

The HCl destroyed the sample in the matter of hours, and obviously I was able to see the Delrin in the sample as it was dissolved into it.

More interestingly, after subtracting the StarSan spectrum with the Starsan and Delrin, I was left with a spectrum that directly lines up with Delrin, so I did notice some Delrin in the StarSan sample. The StarSan sample was not diluted, and was used how you buy it. One can do tests with different dilutions to see the effect, but by principle if it is noticeable in pure StarSan, it should still be noticeable under weaker conditions, but I might not be able to test it at that concetration (because of all the water).

I just finished looking at the measurements, and am putting together some results, the above test was done quickly, so I want to re-do it more carefully.

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Old 09-29-2011, 08:02 PM   #383
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Interesting data, but at 1 to 256 dilution (1oz to 5 gallons) and 30 seconds contact time I'm not all that concerned.

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Old 09-29-2011, 08:06 PM   #384
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Quote:
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Interesting data, but at 1 to 256 dilution (1oz to 5 gallons) and 30 seconds contact time I'm not all that concerned.
OK, good.
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Old 09-29-2011, 08:12 PM   #385
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Not to denigrate what you're doing... it sounds like you're in a CSI lab, pretty high tech stuff. Do you think beer is acidic enough to break down delrin? That might be more concerning given the contact time is weeks/months and that it's actually consumed - unlike the starsan.

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Old 09-29-2011, 08:43 PM   #386
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Quote:
Originally Posted by bruin_ale View Post
Not to denigrate what you're doing... it sounds like you're in a CSI lab, pretty high tech stuff. Do you think beer is acidic enough to break down delrin? That might be more concerning given the contact time is weeks/months and that it's actually consumed - unlike the starsan.
A lot of people leave StarSan in their kegs. I'm not interested in concern rather than I am with a fact like ethanol or StarSan has the capability to leech out chemicals from the plastic. Even at much higher concetrations, knowing those chemicals have the ability is all that I can test. It's more like an intro to CSI lab. It would take too much time/money to figure out on the particulate level if it is happening at certain concentrations.

One thing I don't have the capability to test is different pH levels. Beer will be one of my tests, but the amount of water in beer will make it hard.

It's looking as if isopropyl is the best method for cleaning. I saw very little difference in isopropyl after coming in contact with it, but like I said, I rushed the tests because I was eager to see what was happening. I'm going to leave them for some time and do a more detailed anaylsis
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Old 09-29-2011, 08:43 PM   #387
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Quote:
Originally Posted by bruin_ale View Post
Not to denigrate what you're doing... it sounds like you're in a CSI lab, pretty high tech stuff. Do you think beer is acidic enough to break down delrin? That might be more concerning given the contact time is weeks/months and that it's actually consumed - unlike the starsan.
And as an FYI, I'm already using these mixers, but I'd like to know what's going on because there are stainless steel products out there claiming to do similar things.
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Old 09-30-2011, 01:53 PM   #388
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I have to buy some of these!

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Old 09-30-2011, 01:56 PM   #389
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Quote:
Originally Posted by agenthucky View Post
And as an FYI, I'm already using these mixers, but I'd like to know what's going on because there are stainless steel products out there claiming to do similar things.
Intriguing. Care to share? How about a pointer?

Cheers!
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Old 09-30-2011, 05:38 PM   #390
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Intriguing. Care to share? How about a pointer?

Cheers!
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