FYI:
(
http://www.greenstouch.com/articles_background.htm)
" To glue styrofoam I used GE RTV108 series silicone. There
has been a lot of discussions on which silicone to use and which could be toxic to your fish. Here is the quote from GE company.
I was able to find GE RTV108 in Grainger ($5)
"Aquarium manufacturers have used RTV108 in fresh and saltwater aquariums up to 20,000 gallons. The only product we recommend for aquarium use is RTV108. We appreciate your interest in GE Silicones. Should you have any further questions, please do not hesitate to contact us.""
(
http://fins.actwin.com/aquatic-plants/month.200010/msg00251.html)
"I visited the ge.com website and inquired about which product they recommend
as being safe for aquarium use. I received a couple of responses from two
different people within the company:
"Aquarium manufacturers have used RTV108 in fresh and saltwater aquariums up
to 20,000 gallons."
"The only product we recommend for aquariums is RTV108. I have attached a
data sheet for your review. We appreciate your interest in GE Silicones.
Should you have any further questions, please do not hesitate to contact us
or visit our website at
www.gesilicones.com."
(
http://www.plantedtank.net/forums/diy/27814-building-75g-all-glass-tank.html)
"Silicone
All silicones are not created equal. AGA Aquarium silicone is similar to GE Silicone I "window and door", and is made by DOW. It also appears to be the same thing as Perfecto Aquarium silicone. These silicones are only appropriate for aquariums with large seams, something I have little experience with â€"œ I started my aquarium with AGA Aquarium silicone and kept popping seams. But then I switched to GE RTV108, which is apparently used by some commercial tank builders. With GE RTV108 you can make very small seams. I gather SCS1200 works very well too, but it is difficult to get your hands on in small volumes. Both of these have a much higher adhesion strength than commercial grade silicone like GE Silicone I or “aquarium†silicones, your typical stuff available to use at Big Al's or Home Depot. These commercial (not professional) silicone have so little adhesion strength the manufacturers don’t even list it in their performance specs.
Bottom line - commercial grade silicones can work with big seams, but professional grade silicones do work, and with small seams."
