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] 
______________________________________________________________________