So look for the "AGA" type, huh.
From a thread elsewhere on the internet that I found while researching this issue...
Quote:
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GE 100% Clear Silicone GE-012A once said Aquarium Safe on the label. Why it no longer does is the source of urban legend. One says it's in deference to AGA so they can market the suff for 10x as much in lfs's since AGA uses literly tons of the stuff. Another says it because people would use it to build huge poorly engineered tanks and then sue GE when they broke. All I know is that it the 12A version IS aquarium safe, and available for a very reasonable price. I have used this stuff in the past and have it in my current sump. My understanding is this IS the silicone that AGA, Perfecto and Oceanic all use.
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It seems that what sets one silicone apart from another is that one is
Ammonia based, and the other is Vinegar based. And of course, we know why the
Ammonia based version wouldn’t work.
It also seems that a tube of silicone that is Aquarium Safe is less likely to be specially labeled than one that is not.
So, I plan on hitting the hardware store later today and seeing what the tubes actually say. If there is a distinct aroma of
ammonia or vinegar, then perhaps “the nose knows” when it comes to selecting the right product.
