Hi Bill,

We regularly test flex circuits at 210°C. If there is a low Tg adhesive, like an acrylic adhesive, we may lower the test temperature to 190°C. It is an aggressive test but testing at these temperatures allows you to find weaknesses within the flex circuit without introducing artifact failure modes.

We have tested thousands of flex circuits at these temperatures with good success. Weak circuits fail early, robust circuits will not fail.

If you need more information on our specific testing we should bring the discussion off line.


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] <mailto:[log in to unmask]> 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Noel, William J - GS
Sent: March 11, 2011 9:31 AM
To: [log in to unmask]
Subject: [TN] Service Temperatures

Hello all -

I have a flex design that I need to raise the temperature on to successfully complete an electrical test.  I am trying to determine what the maximum temperature I can safely raise this to without doing any harm to the flexes.  I have copies of the appropriate slash sheets from 4204 and 4203 but I notice that the "Service Temperature" indicates that the "Data is being developed" (DBD).  I am using 4101/24 and I notice that the Tg is 150 - 200 Deg C for it but I need the upper temperature limits for my other materials.  If anyone can provide this information it would be sincerely appreciated.  Thanks in advance for any help you can provide.

4203/1
4203/18
4204/11


Bill Noel
ITT
Geospatial Systems Division
400 Initiative Drive
Rochester, New York  14606-0488
P: (585) 269-5911
F: (585) 672-8042




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