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Corrosion on BeCU

2007

Hi,
My name is Henry Amador, Plant Manager.
WE have been processing, injection molding of plastic in a thin plate of BeCU, and from time to time, after certain period of time (3 to for 4 days) we will notice spots of corrosion on BeCU surfaces. The mold is thoroughly cleaned and we make sure that the surface where BeCU comes in contact are dry and free of any residue. The mold temperature is about 200F and the melt temperature of the plastic being injected to some area of the BeCU plate is about 500F.
The plastic that we are using is LCP-TFE-Nat (Vectra A430)Liquid Crystal Plastic with Teflon.

My questions are:
What can cause this corrosion?
On BeCu plating process, are there chemicals that are use that can cause corrosion if not properly rinse or removed?

Henry Amador
- San Jose, California, USA

The chloride or fluoride in the plastic at the elevated temperature causes the attack.

James Watts
- Navarre, Florida
2007