Sherif,
You sure hit the nail square on the head with your last comment. Of course,
all board shops are now, in these economic times, becoming qualified for
this process and product type, eh?
MoonMan
----- Original Message -----
From: "Sherif Refaat" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, August 16, 2002 9:54 AM
Subject: Re: [TN] Dimensional stable material
> Hi Dee,
>
> Thermount has low X and Y CTE. However the Z axis CTE is higher than FR4.
> When I used this material, couple of years ago, it used to have low copper
> peel strength (repair was very difficult), poor machinability and high
> moisture absorption. Arlon claims that these issues have been already
dealt
> with and that the new improved Thermount does not have these drawbacks.
>
> You should also select a PCB manufacturer that has experience with this
> substrate.
>
> Sherif Refaat, Eng.
> Technology Roadmap Consultants Inc.
> E-mail: [log in to unmask]
> Tel. (514) 624 9842
> Fax (514) 624 0091
>
>
>
>
>
> ----- Original Message -----
> From: "Crepeau, Phil" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, August 15, 2002 6:00 PM
> Subject: Re: [TN] Dimensional stable material
>
>
> hi,
>
> although not inexpensive (which is a relative term) thermount (for
example)
> from arlon (for example) has a low cte.
>
> since you seem to be a non-profit sort of business, you might try
appealing
> to the charitable nature of your supplier for freebies. i mean, who can
> turn down a request for heavily discounted materials coming from the
> 'national optical astronomy observatory'. i mean, we don't have to pay to
> see all those great images at the 'astronomy picture of the day' web site
do
> we (other than our income taxes). the vendor could claim that their
> material is 'space age'.
>
> bon chance,
>
> phil
>
> -----Original Message-----
> From: Dee Stover [mailto:[log in to unmask]]
> Sent: Thursday, August 15, 2002 12:33 PM
> To: [log in to unmask]
> Subject: [TN] Dimensional stable material
>
>
> I have a board that needs to be built with material that has a very low
> rate of thermal expansion.
>
> I believe polyimide material is what I need; however, I would be
interested
> in hearing other possibilities that are still reasonably priced.
>
> I would like to get the specifications to see if it does indeed meet our
> requirements and would also like some guidance on how to properly specify
> this material and prepreg it in a fabrication drawing to ensure I get what
> I want.
>
> You input is appreciated.
>
>
>
>
> Dee Stover [log in to unmask]
> Associate Technician Design
> National Optical Astronomy Observatory
> 950 N Cherry Ave
> Tucson, AZ 85719
> www.noao.edu
> 520-318-8489
> FAX 520-318-8303
>
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