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]
>
>
>
>
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