Is there a materials expert out there that can answer Mike's question below?

B-stage epoxy resin is somewhat of a mystery to many designers. Perhaps
someone can clarify the reference to "High Resin Content" as apposed to ?
what other options are available and how they affect the construction of the
FR4 board. Please copy to the group too so we can all learn from this.

Bill Brooks
PCB Design Engineer , C.I.D., C.I.I.
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
http://pcbwizards.com


-----Original Message-----
From: Mike Valle [mailto:[log in to unmask]]
Sent: Tuesday, May 18, 2004 12:24 PM
To: [log in to unmask]
Subject: [DC] Core Constructions

Hi, I need some help trying to find some information on FR-4
construction and thickness. I've come across a 4-layer stackup on a
cross-section detail on one of our drawings and I can't seem to find it
in IPC-4121. Our b-stage construction calls out for 1 ply of b-stage
HRC (high resin content) 7628 .0068.
Another detail on another drawing calls out for 1 ply of b-stage HRC
(high resin content) 7628 .008. What I've been finding in IPC-4121 is
that there is a FR-4 11 (7.087) 7628 40% RC and a HFR-4 11 (7.087) 40%
RC, which is a high tg. So, my question is - is there such a thing as
HRC - high resin content with varying thicknesses?

Thanks,
Mike Valle
Project Engineer, PCB Design
Shure Inc.
(847)424-4616
[log in to unmask]

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