Rock on...
In a message dated 5/6/2009 9:46:20 A.M. Pacific Daylight Time,
[log in to unmask] writes:
My motives aren't but my façade is, so I'll pass.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Naisbitt
Sent: Wednesday, May 06, 2009 9:36 AM
To: [log in to unmask]
Subject: Re: [TN] What does HIGH GRADE FR-4 mean?
Stone me!
Graham Naisbitt
On 6 May 2009, at 14:51, Douglas Pauls wrote:
> I would say that Dewey has lost his marble.......
>
> Doug Pauls
> Rockwell Collins
>
>
>
> "Whittaker, Dewey (EHCOE)" <[log in to unmask]>
> Sent by: TechNet <[log in to unmask]>
> 05/06/2009 08:48 AM
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to
> "Whittaker, Dewey (EHCOE)" <[log in to unmask]>
>
>
> To
> [log in to unmask]
> cc
>
> Subject
> Re: [TN] What does HIGH GRADE FR-4 mean?
>
>
>
>
>
>
> It is. I thought you'd just take the rest for granite.
> Dewey
>
> -----Original Message-----
> From: Inge [mailto:[log in to unmask]]
> Sent: Tuesday, May 05, 2009 11:24 PM
> To: TechNet E-Mail Forum; Whittaker, Dewey (EHCOE)
> Subject: Re: [TN] What does HIGH GRADE FR-4 mean?
>
> only seven shall's...is the stone plate complete? Nothing about
> dielectric
>
> constant which I count as a primary requirement..and copper
> adhesion...and...?
> Inge
>
>
> ----- Original Message -----
> From: "Whittaker, Dewey (EHCOE)" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, May 05, 2009 8:53 PM
> Subject: Re: [TN] What does HIGH GRADE FR-4 mean?
>
>
> Since Ken and Doug have attempted to handle the humor, I guess I'll
> have
> to
> fill in the technical details. A list of requirements is as follows:
>
>
>
> * The laminate shall have maximum moisture absorption of
> 0.5% (The
>
> actual fabricated bare PB shall have 0.2 % prior to processing).
>
> * The laminates and bonding materials shall have a
> flammability
> rating of V-0 minimum.
>
> * The laminate shall have a glass transition temperature of
> 170°C
> minimum.
>
> * The laminate shall have a decomposition temperature of 340°C
> minimum.
>
> * The allowable point to point variation of the laminate Z-
> Axis
> CTE
> shall be no greater than 3.5% (ideally 3.0% or less) when tested
> between
> 50
> to 260°C.
>
> * The laminate shall demonstrate meeting the requirements for
> thermal resistance to T288 testing for a minimum of 5 minutes.
>
> * There shall be objective evidence that the laminate
> material is
> resistant to conductive anodic filament (CAF) growth.
>
>
>
> There are other things to consider such as phenolic cure systems and
> plating
> adhesion, but this is a start. IPC-4101/126 and /129 are good
> examples of
> high performance FR4s.
>
> Dewey
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Harris Dy
> Sent: Tuesday, May 05, 2009 10:23 AM
> To: [log in to unmask]
> Subject: [TN] What does HIGH GRADE FR-4 mean?
>
>
>
> Hi All,
>
>
>
> Can anyone define High Grade FR-4?
>
>
>
> I think it's a vague requirement that I see on customer drawing. Is
> this
> something that should be obsolete now because today customer should
> really
>
> provide the properties of the laminate that they want to use... eg
> Tg, Td,
>
> Dk.
>
>
>
> Can anyone shed some light?
>
>
>
> Thanks,
>
> Harris
>
>
>
>
>
>
>
>
>
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