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February 16, 2011

SMT Adhesive Turning Black

Sometimes our SMT adhesive will turn a black color during storage. We store the adhesive between 5-10 degrees C.

What could be the cause of this discoloration, and could it be impacting the adhesive properties?



M. T.

Experts Comments

I need a little more info before I can help. What is the adhesive? Who makes it? I can't answer without knowing a little more.

However, the adhesive properties can be evaluated against a control, "known to be good" sample of the adhesive. I suggest using a combination of instruments, such as DSC and TGA, and FTIR to take a look at thermal characteristics of "good" vs "suspect".

I can be more specific if I know more about the adhesive itself.

Jim Williams
Chairman
Polyonics, Inc.
Jim Willimas is a PhD Chemist in Polymers and Materials Science. He specialize in printing, cleaning, inks, and coatings used in electronics manufacturng operations. Williams has more than 30 years experience.

I need a little more info before I can help. What is the adhesive? Who makes it? I can't answer without knowing a little more.

However, the adhesive properties can be evaluated against a control, "known to be good" sample of the adhesive.

I suggest using a combination of instruments, such as DSC and TGA, and FTIR to take a look at thermal characteristics of "good" vs "suspect".

I can be more specific if I know more about the adhesive itself.

Jim Williams
Chairman
Polyonics, Inc.
Jim Willimas is a PhD Chemist in Polymers and Materials Science. He specialize in printing, cleaning, inks, and coatings used in electronics manufacturng operations. Williams has more than 30 years experience.
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