Hi Don, Yes it violates the 50% spacing requirement. I'll post s couple of pictures as soon as I remember how. 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: TechNet [mailto:[log in to unmask]] On Behalf Of Don Vischulis Sent: December 6, 2013 10:03 AM To: [log in to unmask] Subject: Re: [TN] Crazing Siting on an airplane waiting for the door to close. You found a potential defect. It might be crazing or it might be a void in the laminate. I believe both conditions are covered in the spec. The next question is if the defect is large enough to be called a reject able condition. Don Vischulis Sent from my iPhone > On Dec 5, 2013, at 2:05 PM, Paul Reid <[log in to unmask]> wrote: > > 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] > > > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________