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] 
> 
> 
> 
> 
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