Problem? Solution? Chime right in!
(perhaps the world's last 'no registration' site)
"Epoxy bleed out problems"
Current question and answers:February 8, 2021
Hi. I have encountered epoxy bleed out on matrix leadframe. How can I eliminate epoxy bleed out? Can you show or give me a solution or method on how can prevent this bleed out?ALLAN nacional
- mandaluyong city, Philippines
Previous closely related Q&A's starting in:2004
Q. HOW TO ELIMINATE THE EPOXY BLEED OUT PROBLEM IN SILVER NICKEL PLATED AREA?
EPOXY TYPE : ABLEBOND 979
FRAME BASE MATERIAL : Fe PLATING : FULL Cu , FULL Ni , SELECTIVE Ag
CURE temperature ; 150 °C FOR 30 MINUTES
PLEASE HELP TO recommend SUITABLE CURE temperature AND TIME OR OTHER PROCESS THAT CAN ELIMINATE THE EPOXY BLEED PROBLEM. PLEASE ALSO PROVIDE THE POSSIBLE ROOT CAUSE OF EPOXY BLEED OUT IN THIS PLATING PROCESS.CHING CHIN HUI
LEAD FRAMES - BAYAN LEPAS, PENANG, MALAYSIA
Q. [I have the same problem of] HOW TO ELIMINATE THE EPOXY BLEED OUT PROBLEM IN SILVER NICKEL PLATED AREA?Bala Rajangam
A. They are two ways to prevent or minimize the epoxy bleed.
a) Tedious cleaning process using Freon or TCE
b) More effective way is to vacuum bake at 150 °C for 2 hours. This will drive the inherent chemical in the plating itself. This is very effective way of preventing bleed issues.
April 3, 2013
We are NiPdAu plating house and my plating process involves an anti EBO organic coating as a last step of the process. My problem is this coating does not sustain epoxy QMI 519 and always fails EBT (> 5 mils bleed ). Other epoxy such as ST-12 had no issue.
plating - Bayan Lepas, Penang, Malaysia
July 31, 2013
A. Hi Adam,
Anti EBO contains Proprietary-Sulfated-Polyoxyalkylated-Bisphenol-A is useful to reduce QMI519 epoxy bleed out on NiPdAu preplate leadframe.
September 4, 2013
Q. Hi David Shiu,
Thanks for the answer and currently solve the problem by enhancing frame cleaning before coating anti EBO by installing hot DI Water ( soften the water ). Any way, could this solution lead to other potential problem?. FYI, I set the water temperature at 50± 5.
Lead frame manufacturer - Bayan Lepas, Penang, Malaysia
September 6, 2013
A. Hi Adam,
Hot DI rinse can help to clean off NiPdAu surface more effective to ensure no contaminants left prior anti-EBO coating. This is equivalent to car waxing which car body surface must be fully cleaned and free of particles prior waxing. When car waxing is proper done (similar to anti-EBO coating properly done on NiPdAu surface), you will see after raining water droplets in spherical form (contact angle is high) rather than spread over car body surface.
50 °C hot water temperature is suitable. You may verify die-to-pad shear strength/pull force to ensure hot DI rinse does not impact die attach.