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Old 09-16-2012, 01:12 PM   #51
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I wonder if the mystery reaction is somehow causing the exposed side of the material to expand or contract?
No, I think the plasticizers in the plastic are being depleted, leaving the plastic brittle. There are lots of different formulations used as plastisizers; this is what gives all plastics their flexibility. Plasticisers are not water soluble, so beer isn't going to accelerate their migration from the plastic. But they are subject to oxidative degradation, and this is what I suspect is causing the problem. Oxyclean is an oxidative cleaner. Probably heat exacerbates the effect.

I replaced my cracked and brittle sight glasses about 2 years ago (see this). I used to pump oxyclean through my BK overnight. Sometimes it would sit longer than that. I stopped doing that with my new sight glasses (Bobby's) and I haven't had any issue with them (they aren't as clean as I'd like, meh).
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Old 09-23-2012, 12:04 AM   #52
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Negative on the chlorine being a factor.

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Old 09-23-2012, 01:25 PM   #53
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No, I think the plasticizers in the plastic are being depleted, leaving the plastic brittle. There are lots of different formulations used as plastisizers; this is what gives all plastics their flexibility. Plasticisers are not water soluble, so beer isn't going to accelerate their migration from the plastic. But they are subject to oxidative degradation, and this is what I suspect is causing the problem. Oxyclean is an oxidative cleaner. Probably heat exacerbates the effect.

I replaced my cracked and brittle sight glasses about 2 years ago (see this). I used to pump oxyclean through my BK overnight. Sometimes it would sit longer than that. I stopped doing that with my new sight glasses (Bobby's) and I haven't had any issue with them (they aren't as clean as I'd like, meh).
Keep in mind, the Oxyclean by itself doesn't seem to have an effect. It's the Oxyclean plus some ingredient that's in some but not all water supplies that's causing the problem. That ingredient also appears to be removable via charcoal filtration.
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Old 09-24-2012, 03:42 PM   #54
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I have my new sight gauge installed now (Thank You, Bobby).

To make sure, I'll just avoid the oxy from now on.

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Old 06-02-2013, 07:37 PM   #55
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Resurrecting an old thread with new data. I used my Keggle to circulate hot caustic through my plate chiller and noticed the same crazing. I was basically pumping Liquid Drano mixed in five gallons of 180-ish water. I only circulated for about an hour before I drained and rinsed. A couple days later I noticed a crack straight through the tube.

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