Discussion:
Silicone or Urethane
(too old to reply)
ROBERT BABB
2005-12-28 21:17:38 UTC
Permalink
Does anyone know if Urethane (the stuff used to seal windshields in cars)
can be used as the sealant to build a fish tank.
The reason I ask is that I cannot find a black silicone that indicates it is
safe for aquarium use.
I understand most silicones sold in hardware stores contain arsenic to
control mildew growth and therefore is not suitable for aquarium use.
Frank
2005-12-28 23:49:40 UTC
Permalink
Post by ROBERT BABB
Does anyone know if Urethane (the stuff used to seal windshields in cars)
can be used as the sealant to build a fish tank.
Urethane will not work.
Post by ROBERT BABB
The reason I ask is that I cannot find a black silicone that indicates it is
safe for aquarium use.
Home Depot has clear 100% silicone - I have used it many times.........
Frank
Just_Me
2005-12-29 01:31:07 UTC
Permalink
Post by ROBERT BABB
Does anyone know if Urethane (the stuff used to seal windshields in cars)
can be used as the sealant to build a fish tank.
The reason I ask is that I cannot find a black silicone that indicates it is
safe for aquarium use.
I understand most silicones sold in hardware stores contain arsenic to
control mildew growth and therefore is not suitable for aquarium use.
You can order some on-line here.
http://www.bigalsonline.com/catalog/category.xml?pcid1=1537;category_id=1581
or try to find GE #1 clear silicone at the hardware store. It's the same
formula used in commercial aquarium construction.
ROBERT BABB
2005-12-29 12:27:47 UTC
Permalink
Thanks for the info I'll try Home Depot for the silicone GE#1
Post by ROBERT BABB
Does anyone know if Urethane (the stuff used to seal windshields in cars)
can be used as the sealant to build a fish tank.
The reason I ask is that I cannot find a black silicone that indicates it
is safe for aquarium use.
I understand most silicones sold in hardware stores contain arsenic to
control mildew growth and therefore is not suitable for aquarium use.
Bill Stock
2005-12-29 16:56:47 UTC
Permalink
Post by ROBERT BABB
Does anyone know if Urethane (the stuff used to seal windshields in cars)
can be used as the sealant to build a fish tank.
The reason I ask is that I cannot find a black silicone that indicates it
is safe for aquarium use.
I understand most silicones sold in hardware stores contain arsenic to
control mildew growth and therefore is not suitable for aquarium use.
The clear Silicone Crappy Tire sells says it's aquarium safe on the label.
You might want to check it out.
Gill
2005-12-30 00:17:11 UTC
Permalink
You can also try the GE clear silicone SE1124 sold by
Home Hardware Store. "It has a 35 year durability and
safe for aquarium" written right on the tube.

Gill
David Zopf
2006-01-03 14:17:40 UTC
Permalink
Post by ROBERT BABB
Does anyone know if Urethane (the stuff used to seal windshields in cars)
can be used as the sealant to build a fish tank.
The reason I ask is that I cannot find a black silicone that indicates it
is safe for aquarium use.
I understand most silicones sold in hardware stores contain arsenic to
control mildew growth and therefore is not suitable for aquarium use.
Many/most iundustrial urethanes use organo-tin catalysts (like dibutyl tin
dilaurate) to cure/react, many of which are "no-no's" for marine and in vivo
human contact.

Regards
R David Zopf
Ross T.
2006-01-05 16:38:45 UTC
Permalink
I wonder If that would apply, for Urethane paint in an aquarium setting?
I imagine if one was to build a Large Plywood tank, Latex might be
best,? Or Epoxy?

Does anyone here have experience, with building one of these tanks?

Ross T
David Zopf
2006-01-05 18:21:13 UTC
Permalink
Post by Ross T.
I wonder If that would apply, for Urethane paint in an aquarium setting?
I imagine if one was to build a Large Plywood tank, Latex might be best,?
Or Epoxy?
Hi Ross,

I don't see the compelling reason to use plywood, although I can guess
that the final cost might be attractive (the nuisance of its questionable
durability would make me reach for some acrylic and a plastic welder, but
each of us is different, I suppose). As far as the better chemistry for
minimal interaction with aquatic life, I'll put my money on a marine grade
2-component epoxy paint. Even then, I would probably run it through a few
leaching cycles before attempting to put anything living in there (even
bacteria). By a leaching cycle, I mean to fill the tank with clean water to
its full capacity, run the temperature up to +5 to +10 degrees over the
intended service temperature, and then drain and replace the water after
several days at temperature. I'd do this three times, to start. It can go
a fair ways towards pulling out any unexpected nastiness in the paint.
Carbon filtration during cycling and during the early establishment of the
tank can/might help with any further leaching of industrial chemicals.

Some might argue that a water-based latex might be more benign to aquatic
life, but I would question its durability over the long term.
Post by Ross T.
Does anyone here have experience, with building one of these tanks?
I have no experience with building such a tank specifically, but I do have
some experience with industrial paints, adhesives, etc. and the chemistry
behind them.

Regards,
DaveZ
Atom Weaver
Ross T.
2006-01-06 03:26:53 UTC
Permalink
Thank you for the reply. It's nice to get depth of knowledge through
sharing information, Appreciated.

Ross T :o)
Papa Red
2006-01-07 00:45:05 UTC
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Thanks for the info.~Papa Red.

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