IPC-4101/40&41 are both polyimide.
I think the only difference is the Tg

40 has a minimum Tg of 200ºC
41 has a minimum Tg of 250ºC

So a 41 would meet the 40 spec.

hope this helps
Geoff Layhe

-----Original Message-----
From: Collins Graham [mailto:[log in to unmask]]
Sent: Thursday, September 25, 2003 5:12 PM
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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