TECHNET Archives

October 2013

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Victor Hernandez <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 25 Oct 2013 07:39:08 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (62 lines)
Solder DIP or FLOAT?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of SARAVANAN R
Sent: Thursday, October 24, 2013 6:16 PM
To: [log in to unmask]
Subject: [TN] Fw: [TN] PCB BAKING DURING FABRICATION

Dear all ,
If the baking temperatures are high, what are the effects on the PCB ?.
regards,
R.Saravanan



On Thursday, 24 October 2013 11:23 PM, "Whittaker, Dewey (EHCOE)" <[log in to unmask]> wrote:

Expecting good results using those higher than needed temperatures is Dicy at best.
Dewey


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ramakrishnan Saravanan
Sent: Thursday, October 24, 2013 8:43 AM
To: [log in to unmask]
Subject: [TN] PCB BAKING DURING FABRICATION

We are using 170 deg C IPC 4101/24  material for making hi reliability PCBs. The PCB coupons are subjected to 6X Solder Dip to access PTH integrity & laminate integrity. 5X R/W also carried out.

to achieve this initial laminates(cores) are baked at 140 deg C for 4 hours.
after blak OXIDE  baked at 140 deg C for 4 hours after MLB pressing baked at 140 deg C for 4 hours after electroless copper plating baked at 140 deg C for 4 hours prior to HASL baked at 140 deg C for 4 hours a total of 20 hours at 140 deg C baked during fabrication.


after PCB fabrication. the coupon is separated from PCB and the coupon is baked for 12 hours at 120 deg C.

The coupon is subjected to 6X solder dip & 5x R/W simulation.

My doubts are

Q1. These extra long hours of baking will deteriorate the chemical & mechanical properties of the laminates ?
      if so , what are the properties are getting affected. The material dicy cured FR4.

Q2. Whether Test coupon results will reflect the quality of PCBs ?.


R.Saravanan

______________________________________________________________________
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] 
______________________________________________________________________

ATOM RSS1 RSS2