Additional considerations between the two materials is that the
absorption rate of polyimide is greater than standard epoxy glass.
Therefore, it could affect electrical performance and/or assembly in
some applications. Furthermore, most polyimide cannot achieve the same
level of flammability as standard epoxy. So do not expect to receive a
94-V0 for polyimide. More than likely you would receive a 94-HB
flammability rating. Of course this depends on the thicknesses utilized
and the coatings on the laminate.
Regards,
Gary Ferrari
Ferrari Technical Services
860-350-9300
McGlaughlin, Jeffrey A wrote:
> I agree with Jack the dielectric properties for polyimide (/40) aren't
> different enough for that to be a driving factor in its selection. The
> factors that I have seen sited in the past have always been the thermo
> mechanical properties - Tg and CTE. The military pushed /40 for
> avionics for a long time with LCC components since the hermetically
> sealed ceramic carriers matched the polyimide's CTE closer than the
> FR-4's.
>
>
> Jeffrey McGlaughlin, CID
> Engineering Designer EAS
> 4-2-50 room
> x-7582 Phone
> (614)458-7582 Fax
>
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Jack
> C. Olson
> Sent: Wednesday, January 25, 2006 12:10 PM
> To: [log in to unmask]
> Subject: Re: [DC] Polyimide laminate material
>
> Greetings,
>
>>From my experience, engineers care more about "Dielectric Constant"
> than anything else, because it affects their impedance calculations.
> Are your designs impedance controlled?
>
> However, I think the relevant value on the slash sheets is item 6
> (permittivity), and /24 is listed as identical to /40!
>
> (unless you have interesting constraints, all of the other things like
> arc resistance and flammability and breakdown voltage are probably
> not even an issue)
>
> Now you got me wondering....
> sorry I can't help more,
>
> Jack
>
>
>
>
>
>
> "Bremer, Gary" <[log in to unmask]>
> Sent by: DesignerCouncil <[log in to unmask]>
> 01/25/2006 10:13 AM
> Please respond to
> "(Designers Council Forum)" <[log in to unmask]>; Please respond to
> "Bremer, Gary" <[log in to unmask]>
>
>
>
> To
> To
> [log in to unmask]
> cc
>
>
>
>
> Subject
> [DC] Polyimide laminate material
>
>
>
>
> Caterpillar: Confidential Green Retain Until: 02/24/2006
> Retention
> Category: G90 - General Matters/Administration
>
>
> The question I have is on IPC-4101/40 material as compared to
> IPC-4101/24 material. Our engineering stated they chose the Polyimide
> material for all the PWB designs because of superior Dielectric
> properties so to make the PWBs as thin as possible. From reading the
> specification sheets for both I do not see where IPC-4101/40 material
> Dielectric properties except for Arc Resistance is any better than
> IPC-4101/24 material. Could someone please help me out in understanding
> this issue with the dielectric properties? I would like to have a
> Flammability rating of V-0 if possible on the PWBs, is there a Polyimide
> material that can give me this property?
>
>
>
> Gary Bremer
> Senior Manufacturing Engineer
>
> Curtiss-Wright Controls Inc.
> Embedded Computing -Subsystem
>
> 28965 Avenue Penn
> Santa Clarita, CA 91355-4185
> Main: 661.257.4430 extension 2170
> Fax: 661.257.4782
>
>
> e-mail: [log in to unmask] <mailto:[log in to unmask]>
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>
> NOTICE: This e-mail communication is private and confidential and is
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