Graham,
They could be the same Polyimide material,but /41 has a minimum 250 degrees
C glass transition temperature requirement,whereas /40 is only 200 degees C.
/40 is equivalent to old MIL-S-13949/10 -GI,GIN,GIJ,GIP,GIL
/41 is equivalent to old MIL-S-13949/10-GIL,GIP
Hope this helps.
Dewey
> -----Original Message-----
> From: Collins Graham [SMTP:[log in to unmask]]
> Sent: Thursday, September 25, 2003 9:12 AM
> To: [log in to unmask]
> Subject: [TN] prepreg classification
>
> Hello Folks!
> A question for someone with knowledge of PWB laminant materials. I'm
> sure IPC-4101 would tell me, but I don't have it.
>
> If I've ordered material per IPC-4101/40, and have received material
> per IPC-4101/41, is the /41 material:
> a) the same material but tested to a higher standard?
> b) better than but a different material?
> c) worse than?
> d) some combination of these?
>
> I know the /40 is a polyimide material, I don't know what a /41 is.
>
> Thanks!
>
> regards,
>
> Graham Collins
> Process Engineer,
> Northrop Grumman Canada Corporation
> Halifax
> (902) 873-2000 ext 6215
>
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