Re: ATM - GE II Silicone -- Too Old!

["William Thornley" <billt051@hotmail.com>]

Hi All,

Can any Australians on the list tell me the brand of an Australian product 
that is the equivalent to GE II silicone or the other RTVs available in the 
USA. I want to attach my secondary to it's holder. I have 2 candidates from 
the Selleys range - Selleys ALL CLEAR and Selleys WINDOW & GLASS SILICONE 
SEALANT. See:-

http://www.selleys.com.au/products/sealants/index.htm

WINDOW & GLASS SILICONE SEALANT is acid curing and ALL CLEAR is a co-polymer 
sealant.

Or is there another that we use down here?

Cheers

Bill Thornley

Sydney Aus.

>From: "Richard Schwartz" <richas@earthlink.net>
>Reply-To: "Richard Schwartz" <richas@earthlink.net>
>To: <atm@shore.net>
>Subject: ATM - GE II Silicone  -- Too Old!
>Date: Mon, 13 Aug 2001 20:11:15 -0700
>
>I have long been an advocate of GE II silicone for mounting telescope 
>optics, and I have never had a problem with it... until today.
>
>I suspected something was wrong because it was very difficult to squeeze 
>out of the tube as if partially cured, and because it did not have the 
>usual acetic acid smell.   The goop did not cure at all.
>
>I checked the label on the tube, and it referred to a barely legible 
>expiration date for the material.  The expiration date was October, 2000.   
>It is now August 2001, so the stuff is ten months out of date.
>
>So, when using silicone, check...
>
>(1) the expiration date pressed into the base of the tube,
>
>(2) the stuff easily squeezes out of the tube,
>
>(3) there must be a smell of acetic acid.
>
>As usual, make sure all surfaces to be bonded are grease-free by cleaning 
>them with acetone; smear a thin layer onto each surface with your finger 
>before final assembly.
>
>. . . Richard
>


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