valox

[Mopar Guy]

Hello everyone,

I'm having trouble molding valox 420 seo around electrical pins. I've heated mold & pins and done everything by the book and then some. I get cracks between pins a day or sometimes two after they are molded. As this is a new mold, and it was a part previously purchased overseas, I starting to wonder if I'm using the same material for this job. I've opened gates to the point where I may want to move them closer to pin area? Any suggestions would be appreciated.

thanks

[Suhas]

Co-incidentally, I have worked with Valox 420 a lot and also written my overdrying paper based on some findings I had. I also did a LOT of connector molding. I can hear some purists shouting right now since I am using the word overdrying because it is more like 'over exposing of the resin to the hot and dry air' - OK agreed. Valox needs 4- 8 hours of drying per the datasheet. I think even 8 is too much, Check the moisture and limit the drying.
For the issue you are having, I would do 2 things
1. Dry fresh resin just till the moisture level drops to what is acceptable. Mold some parts and look at them in 2-3 days.
2. Look at the venting at the bottom of the pins. That will help.
Let us know.
Suhas

[rickbatey]

Could it be oil on pins from stamping? Molded in stress? I've ran Valox but not for over molding. I'm grasping at straws for an answer on this one.
Rick.