From the HBD Archive
Subject: Re: Silicone Rubber Caulking
Date: 1992-07-08 14:26:00 GMT

> From: "Roger Deschner " <U52983@UICVM.UIC.EDU>
> ...
> I'm about to use it, but I am going to be sure to find the variety
> which claims to be OK for aquarium use. I believe other types will
> emit trace amounts of solvents. I figure if it's formulated not to
> kill tropical fish, it won't do me in either.

Silicone rubber caulks, unless marked "safe for aquarium use", contain
poison (cyanide? arsenic compounds? I don't remember) to resist the
formation of mold and mildew when used outdoors or in dark, damp places.
This poison will leach out over time and kill your fish if you use the
standard caulk in an aquarium. I would not use it in beer-making. The
"safe" kind should be all right. The "solvent" released during curing
is acetic acid, and is common to all silicone caulks. It shouldn't do
any worse than sting your eyes if you get too close while the caulk is
setting up.

> "Aquarium Seal" is likely to be slightly more costly than other types
> of silicone rubber caulking.

If you buy it as "Aquarium Sealer" in a pet store, then yes, it will be
much more expensive. If you just go to the hardware store and get a
tube that's marked "safe for aquaria", then it shouldn't be any more
expensive than the standard mildew-resistant stuff.

-- Keith

| W. Keith Brummett (614) 860-3187 AT&T, Room 3B202 |
| att!cblph!wkb or, FAX: (614) 868-4021 6200 E. Broad St. |
| R,DW,HAHB! Columbus, OH 43213 |

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