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jrsatx20
Sun, 25th Jul 2010, 02:46 PM
Which silicon is aquarium safe.
txg8gxp
Sun, 25th Jul 2010, 03:13 PM
GE silicone 1 not 2. Just make sure it doesn't have mildew stuff in it. Or could always get the stuff from LFS
jroescher
Sun, 25th Jul 2010, 03:30 PM
Stay away from anything that says kitchen or bath, or says mildew resistant.
Big_Pun
Sun, 25th Jul 2010, 03:32 PM
this stuff is the best http://www.aquariumspecialty.com/catalog/product_info.php?products_id=6796
Stang man
Sun, 25th Jul 2010, 09:30 PM
Needs to be a 100% silicoln not anything you can get at a hardware store for sure. I didn't know the made a under water type Hummm!!! That's interesting I will have to check on that. I have built my tanks and sumps out of plexiglass for so many years I guess I'm spoiled!!! Lol
Gseclipse02
Sun, 25th Jul 2010, 09:47 PM
i heard the black stuff is 3 times at strong as clear
jesserettele
Tue, 27th Jul 2010, 09:37 PM
I found out that momentive 100 silicones are what aquarium manufacturers use. It is an industrial silicone, not a consumer silicone. Grainger carries it.

http://www.grainger.com/Grainger/GENERAL-ELECTRIC-Silicone-4UH07?Pid=search

http://i946.photobucket.com/albums/ad302/Jesserettele/75%20gallon%20build/mgrtv108silicone.jpg



type I consumer 100% silicone can be used on internal non structual baffles.
twychopen
Sat, 11th Sep 2010, 10:09 AM
Sorry to hijack but I figured it was better than beginning a new thread. I am building a sump with plexiglass from lowes. Will the momentive 100 work on the entire thing? The dimesions are 30" long x 15.5" Wide x 14" Tall. I can put supports throughout as long as it is strong bonding silicone.
jrsatx20
Sat, 11th Sep 2010, 10:13 AM
How thick is the Plexiglas.problem may be with bowing of the long Faces which will cause the seams to fail
twychopen
Sat, 11th Sep 2010, 10:18 AM
Man I cant remember, its the second thickest stuff at lowes if I remember correctly. Its not quite 1/4" i dont think. What do you suggest? Shorten the sump altogether?
txav8r
Sat, 11th Sep 2010, 10:34 AM
Plexiglass and silicone is a bad idea. You need to use "weld on 3" to bond the acrylic. Silicone will not work.
twychopen
Sat, 11th Sep 2010, 02:00 PM
where would I find that? Lowes and HD don't carry it do they?
jrsatx20
Sat, 11th Sep 2010, 02:06 PM
Lowes sells special silicone for Plexiglas but don't no if its aquarium safe. The Plexiglas at Lowes is about the same price as regal or allied plastics here in San Antonio over off of rittiman. They sell the glue there.
jrsatx20
Sat, 11th Sep 2010, 02:08 PM
U will probably need a whole sheet of acrylic to make a sump that long.
twychopen
Sat, 11th Sep 2010, 02:13 PM
are they open sundays? I am not in san antonio but have a friend that is there.
txav8r
Sat, 11th Sep 2010, 02:16 PM
They are closed on the weekends.
Stang man
Sun, 12th Sep 2010, 12:39 PM
Silicoln will not adhere to plexi it is not strong enough you must use weld on #4 you can usally get this at a plexi glass warehouse if they will sell it to you. You can use plexi inside of a glass aquarium but will leak after some time. The best way would be to do a glass aquarium and have Lowes cut the glass for you.
twychopen
Sun, 12th Sep 2010, 11:36 PM
I have done that b4 but the glass was so sharp. I guess I could sand it down?
twychopen
Wed, 15th Sep 2010, 06:31 PM
The momentive, is it for glass only? And is it stronger than the normal silicone?
jesserettele
Sat, 2nd Oct 2010, 11:42 AM
The momentive, is it for glass only? And is it stronger than the normal silicone?

Yes, momentive is silicone and silicone is for glass, it is stronger than normal silicone because it is commercial grade not consumer grade. I did a project with both and found out the hard way. Grainger has momentive's MSDS with strengths, cure times, etc...