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Date: | Fri, 4 Nov 2005 16:50:37 -0500 |
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We are scoring quite a bit of these - the flexural strength is slightly
higher on the non-dicey systems but we have not seen issues with
standard scores webs - the weights are similar to FR4. A 33% web
thickness is high, we target from 15-25% depending on the pallet config
and assembly needs - 15% is the general target. A .030" web has a good
strength as the reinforcement is still intact with multiple plies
working against you.
Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED
76 Technology Drive - POB 1890
Brattleboro, Vermont 05302
Voice: 802.257.4571.21 Fax: 802.257.0011
http://www.vtcircuits.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Friday, November 04, 2005 11:44 AM
To: [log in to unmask]
Subject: [TN] V-score depth of new RoHS board materials
Good afternoon,
Has anybody started buying boards fab'd using Isola 410 or Polyclad
FR-4-370-HR and had difficulty breaking the boards at the v-score?
We have some 0.090 boards that were cut down to 0.030 and were still
difficult to break apart. Had them reworked to 0.020, but I'm worried
that this may be too thin.
Thanks in advance,
Phil
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