Re: [ATM] RE: Silicone Failure

["David Harbour" <scarab2@cox.net>]

Study the Master, Ritchey.

He would never have used such a "faddish" material to mount mirrors. He
might have used it to make lap molds.

Of course, he got fired almost everywhere he worked. But then, there is the
60", the 100", and the 40".... all still producing results.

Dave

P.S.- No one could persuade me to use it to mount mirrors.


----- Original Message ----- 
From: "Charles Mitchard" <charlesmitchard@iinet.net.au>
To: <atm@atmlist.net>
Sent: Friday, May 27, 2005 1:12 AM
Subject: Re: [ATM] RE: Silicone Failure


>
> I do not see how RTV can fail assuming:-
> a) The joint surfaces were clean.
> b) The product was within its use by date (it does fail when old in the
tube)
> c) It was the correct type of Silicone for the two dissimilar materials.
>
> Consider the stresses that form from the pressure of water in a 6ft x 2ft
x
> 2ft aquarium just glued together with RTV and no other reinforcements.
> Vastly higher than what our tiny mirrors are subjected to.
> I've never had an aquarium joint fail. (Broken the glass from my
stupidity)
> One word of warning, I've had two tubes of silicone bathroom sealer (non
> acetic acid) that never set.
> When I phoned the company they knew it was a faulty batch and replaced it
> but had never sent out any warnings.
>
> My take would be if the joint peeled apart leaving one surface clean then
> joint cleaning was the problem
> If the joint split leaving adhesive on both surfaces then it was old stock
> or incompletely cured or the wrong product.
>
>
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