From: "at making" 
To: rguinamard{at}infonie.fr, Hugues.Laroche{at}ses-astra.com,
        Michael.Bawden{at}spr.gases.boc.com
Cc: atm{at}shore.net, owner-atm{at}shore.net
Reply-To: "at making" 


Hi,

The silver coating was really not strong at all. Is reflectivity was good
but it did not last for long.

Fr‚d‚ric G‚a
http://astrosurf.com/altaz/index_e.htm


>From: Rapha‰l Guinamard 
>Reply-To: Rapha‰l Guinamard 
>To: ,"Bawden,Michael"
>
>CC: ,
>Subject: Re: ATM Coating Silver?
>Date: Sat, 10 May 2003 00:17:19 +0200
>
>
>This French company doesn't do anymore silver coating, but I don't know
>exactly why. I know they 've had problem with longevity....maybe that's the
>reason...?
>There is also an Italian company that make silvered mirror. The protection
>is MgF2. The optician told me he doesn't know exactly how long it last, but
>he thinks it last less than Aluminium coating.
>Rapha‰l Guinamard
>----- Original Message -----
>From: 
>To: Bawden,Michael 
>Cc: ; 
>Sent: Friday, May 09, 2003 9:47 AM
>Subject: Re: ATM Coating Silver?
>
>
>
>
>Hi Michael,
>
> >>>
>I  am about to finish polishing and after inquiring about aluminium
>coating
>here in  Brisbane ($380 for 10"!!) I am looking at doing a silver coat
>instead.
>My  question is, Can the protective coatings they use on aluminium be put
>over the  silver as I assume it is not an electrically driven process in
>a vacuum  chamber?
><<<
>
>In France a company proposes also protected silver. Done in vacuum
>as for standard Al, as far as I know.
>I recently *heard* however that the longevity is quite shorter than std
>aluminium.
>And, in any case all their coatings are horribly expensive! On the other
>hand,
>even here in Europe $380 to coat a 10" seems much!
>
>Fr‚d‚ric, do you wish to comment further?
>
>Hugues Laroche
>Luxembourg, Europe
>
>
>
>
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