Agree with Russ's interpretation.
Mahendra Gandhi
SME - PWB Technologies
Aerospace Engineering
One Space Park, ST44EE/M5_1st
Redondo Beach, Ca. 90278/ [log in to unmask]
mOffice: 310.813.6857 Fax: 310.812.8630
-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Russ Shepherd
Sent: Thursday, December 05, 2013 1:27 PM
To: [log in to unmask]
Subject: EXT :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
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