7628 glass has different yield thickness based on resin content and the
rheology. You can purchase 7628 in epoxy from a yield per ply thickness
of .0065" to where you are with yours. 7629 glass can give you up to
.009" in yield as this is some what heavier glass. I think the standard
has been a .007" per ply yield - this is fairly standard from laminate
suppliers.
Jeffrey Bush
Director, Quality Assurance and Technical Support
76 Technology Drive - POB 1890
Brattleboro, Vermont 05302-1890
Tel. 802.257.4571.21 Fax. 802.257.0011
[log in to unmask]
http://www.vtcircuits.com
-----Original Message-----
From: Andrew Medina [mailto:[log in to unmask]]
Sent: Monday, July 12, 2004 11:35 PM
To: [log in to unmask]
Subject: Re: [TN] 7628 prepreg?
Importance: High
Since were discussing about the 7628 prepreg,. Does anybody know the
standard thickness of this prepreg type.
In our process we are getting around 0.22 mm,
Andrew J. Medina
Quality Control Section
QM Department
Daeduck Phils., Inc.
Tel # : 046-4370747 loc 293
Fax # : 046-437-0749
Mobile # : +639275312569
E-mail : [log in to unmask]
Jeffrey Bush <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
07/12/2004 08:40 PM
Please respond to
"TechNet E-Mail Forum." <[log in to unmask]>; Please respond to Jeffrey
Bush <[log in to unmask]>
To
[log in to unmask]
cc
Subject
Re: [TN] 7628 prepreg?
Common type, stable, low resin content and likely predicable thickness
is this is important. Otherwise PCB house should be left to determine
the optimal stack for the board geometry and end use.
Jeffrey Bush
Director, Quality Assurance and Technical Support
76 Technology Drive - POB 1890
Brattleboro, Vermont 05302-1890
Tel. 802.257.4571.21 Fax. 802.257.0011
[log in to unmask]
http://www.vtcircuits.com
-----Original Message-----
From: Brooks,Bill [mailto:[log in to unmask]]
Sent: Friday, July 09, 2004 5:08 PM
To: [log in to unmask]
Subject: [TN] 7628 prepreg?
Bill Brooks
PCB Design Engineer , C.I.D., C.I.I.
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 http://pcbwizards.com
Why would a designer specify 7628 prepreg in the construction of a
board? What characteristics are unique to it? Bill Brooks, CID
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