hi paul, in my opinion, what you have here is an artifact of drilling; not
a base material or lamination defect, which is how crazing is defined.
this artifact may only be visible in darkfield, normal lighting may not
reveal it.
this artifact is further enhanced if etchback is used. its a wicking path
that didnt plate up because its too deep.
wicking acceptance criteria is defined for the plated part, not the
invisible path that remains....
this would pass group a (lot conformance), but may not perform well if caf
tested.
Joey Rios
PWB & Process Quality Eng'r
i3 Electronics
1093 Clark St.
Endicott, NY 13760
Office: 607-755-5896; Cell: 607-206-3642
From: Paul Reid <[log in to unmask]>
To: <[log in to unmask]>,
Date: 12/06/2013 10:21 AM
Subject: Re: [IPC-600-6012] Crazing
Sent by: IPC-600-6012 <[log in to unmask]>
Hi Russ,
I'll try with this email. I think that IPC strips all attachments however.
Sincerely,
Paul Reid
Program Coordinator
PWB Interconnect Solutions Inc.
235 Stafford Rd., West, Unit 103
Nepean, Ontario Canada, K2H 9C1
613 596 4244 ext. 229
Skype paul_reid_pwb
[log in to unmask]
-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Russ
Shepherd
Sent: December 6, 2013 9:42 AM
To: [log in to unmask]
Subject: Re: [IPC-600-6012] Crazing
Hi Paul,
Can you attach the photo to this email string?
Sincerely,
Russ Shepherd
Vice President of Operations
MICROTEK LABORATORIES
-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Paul Reid
Sent: Friday, December 06, 2013 5:34 AM
To: [log in to unmask]
Subject: Re: [IPC-600-6012] Crazing
Hi Russ,
Maybe you can help. How do I post pictures to the IPC site?
Sincerely,
Paul Reid
Program Coordinator
PWB Interconnect Solutions Inc.
235 Stafford Rd., West, Unit 103
Nepean, Ontario Canada, K2H 9C1
613 596 4244 ext. 229
Skype paul_reid_pwb
[log in to unmask]
-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Russ
Shepherd
Sent: December 5, 2013 4:27 PM
To: [log in to unmask]
Subject: Re: [IPC-600-6012] Crazing
Crazing is an externally observable characteristic. If you see crazing in
a microsection it would fall under laminate defects, such as delamination,
laminate voids or cracks.
If you have a photo of the condition it might make it easier to comment
on.
Sincerely,
Russ Shepherd
Vice President of Operations
MICROTEK LABORATORIES
-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Whittaker,
Dewey (EHCOE)
Sent: Thursday, December 05, 2013 1:13 PM
To: [log in to unmask]
Subject: Re: [IPC-600-6012] Crazing
Was the observation as received or after thermal stress?
Dewey
-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Paul Reid
Sent: Thursday, December 05, 2013 2:06 PM
To: [log in to unmask]
Subject: [IPC-600-6012] Crazing
I was just on a conference call where we found crazing (a separation
between glass fibers and the epoxy system), in a microsection. The
fabricator stated that this had to be evaluated looking at a board
macroscopically and could not be evaluated microscopically.
Crazing is called out in IPC-A- 600 in section 2, paragraph 2.3.2 page 18,
which is "Externally Observable Characteristics". In A-600 there is
picture of a microsection showing the defect but it states that a
microsection is not required.
In IPC 6012-2010 crazing is call out in 3.3.2.2, page 12, which states (I
am paraphrasing), "Crazing shall not violate greater than 50% of the
distance between adjacent conductors..." The document then refers to IPC A
600.
What is your take on their argument that crazing should not be evaluated
microscopically as per IPC?
Sincerely,
Paul Reid
Program Coordinator
PWB Interconnect Solutions Inc.
235 Stafford Rd., West, Unit 103
Nepean, Ontario Canada, K2H 9C1
613 596 4244 ext. 229
Skype paul_reid_pwb
[log in to unmask]
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