Re: [APD] Silicone that really sticks

["S. Hieber" <shieber at yahoo_com>]

What is safe about safety glass are two things. First the
glass is tempered, so that when it fractures it breaks into
thousands of small shards instead of just a few large heavy
pieces. Second, there is a semi-solid layer between two
outer layers of tempered glass. The inner layer tends to
hold all the pieces together even when the glass is broken,
reducing the number of pieces than might go flying about.

In aquaria, the tempered glass is stronger than
non-tempered glass of equal weight. Unfortunately, it
breaks into many pieces when cracked so scractching and
drilling are illadvised.

Put in very rough terms, glass is tempered by rapidly
cooling the outer surfaces, which puts the surface under
tension. This gies it its superior strength. Howevern if
the surface is broken, the release of the tension can be
enough to continue the scratch or crack, releasing more
tension, etc.

Scott H.

--- urville <urville at peoplepc_com> wrote:

> really? I had no idea. Isnt tempered safety glass though?
> Like on vehicles?
> 
> S. Hieber wrote:
> 
> >Well, expensive, anyway. If I was going to post a
> message
> >suggesting that someone put sandpaper to glass, I felt
> it
> >important to add that one shouldn't sand tempered glass.
> >
> >Usually, the tempered glass is used only on the bottom
> and
> >then, only on larger tanks. The main value is that is
> saves
> >loads on shipping weight.
> >
> >Scott H.
> >
> >--- urville <urville at peoplepc_com> wrote:
> >
> >  
> >
> >>I dont thinki've ever seen a tank made of tempered
> glass.
> >>That would be 
> >>a really, really bad idea.
> >>ian
> >>
> >>S. Hieber wrote:
> >>
> >>    
> >>
> >>>Silicone is not a high-adhesion material, but it has
> >>>      
> >>>
> >>lots
> >>    
> >>
> >>>of give (resiliency) so it works well for particular
> >>>purposes.
> >>>
> >>>You'll probably be better off with a marine epoxy,
> >>>      
> >>>
> >>although
> >>    
> >>
> >>>it would work better if you had something a little
> rough
> >>>      
> >>>
> >>to
> >>    
> >>
> >>>stick to. If you sand the glass with #400 sandpaper,
> >>>      
> >>>
> >>that
> >>    
> >>
> >>>will give the epoxy a better grip. Sanding is NOT
> >>>recommended, of course, with tempered glass.
> >>>
> >>>Scott H.
> >>>
> >>>--- Tom Wood <tomwood2 at flash_net> wrote:
> >>>
> >>> 
> >>>
> >>>      
> >>>
> >>>>I'm using 1/2" thick black eggcrate across the back
> of
> >>>>        
> >>>>
> >>my
> >>    
> >>
> >>>>90 gallon. It's 
> >>>>attached with black zipties to standoffs made of
> black
> >>>>eggcrate that is 
> >>>>siliconed to the tank walls. The silicone fails
> >>>>        
> >>>>
> >>regularly
> >>    
> >>
> >>>>when doing 
> >>>>maintenance that applies a stress to the connection.
> >>>>        
> >>>>
> >>I've
> >>    
> >>
> >>>>used GE RTV 108 
> >>>>designed for aquariums as well as the regular
> hardware
> >>>>store stuff. Is 
> >>>>there a type, or glue, that will grip the glass
> better?
> >>>>The standoffs are 
> >>>>two cells wide by about eight inches long, so the
> >>>>connection to the glass 
> >>>>is 1/2" by 8" long.
> >>>>
> >>>>TW 
> >>>>
> >>>>
> >>>>_______________________________________________
> >>>>Aquatic-Plants mailing list
> >>>>Aquatic-Plants at actwin_com
> >>>>http://www.actwin.com/mailman/listinfo/aquatic-plants
> >>>>
> >>>>   
> >>>>
> >>>>        
> >>>>
> >>>* * * * * * * * * * *
> >>>Have you uploaded your photos? 
> >>>Sent in the Photo Release Form?
> >>>Don't wait too long for that perfect picture-taking
> >>>      
> >>>
> >>moment; the 
> >>    
> >>
> >>>September 15 deadline for entries to the AGA
> >>>      
> >>>
> >>Inernational 
> >>    
> >>
> >>>Aquascaping Contest is fast approaching.  
> >>>
> >>>Share the fun and show your work!
> >>>
> >>>http://showcase.aquatic-gardeners.org
> >>>_______________________________________________
> >>>Aquatic-Plants mailing list
> >>>Aquatic-Plants at actwin_com
> >>>http://www.actwin.com/mailman/listinfo/aquatic-plants
> >>>
> >>> 
> >>>
> >>>      
> >>>
> >>_______________________________________________
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> >>Aquatic-Plants at actwin_com
> >>http://www.actwin.com/mailman/listinfo/aquatic-plants
> >>
> >>    
> >>
> >
> >
> >* * * * * * * * * * *
> >Have you uploaded your photos? 
> >Sent in the Photo Release Form?
> >Don't wait too long for that perfect picture-taking
> moment; the 
> >September 15 deadline for entries to the AGA
> Inernational 
> >Aquascaping Contest is fast approaching.  
> > 
> >Share the fun and show your work!
> >
> >http://showcase.aquatic-gardeners.org
> >_______________________________________________
> >Aquatic-Plants mailing list
> >Aquatic-Plants at actwin_com
> >http://www.actwin.com/mailman/listinfo/aquatic-plants
> >
> >  
> >
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> 


* * * * * * * * * * *
Have you uploaded your photos? 
Sent in the Photo Release Form?
Don't wait too long for that perfect picture-taking moment; the 
September 15 deadline for entries to the AGA Inernational 
Aquascaping Contest is fast approaching.  
 
Share the fun and show your work!

http://showcase.aquatic-gardeners.org
_______________________________________________
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com
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