Epoxy Shrinkage Problem
Epoxy Shrinkage Problem
(OP)
I am using an epoxy to hold electrical contacts into an injection molded polyester block. Upon curing the shrinkage of the epoxy is significant enough the misalign the electrical contacts. I would like to know how to control the shrinkage without introducing new chemicals. For instance the epoxy already has %61 filler if I were to increase the filler this would decrease the shrink but the dielectric strength and mechanical strength would also decrease. Can the curing process have a significant affect on the shrinkage? Any info would be appreciated.





RE: Epoxy Shrinkage Problem
cure time, however delayed by humidity or temperature, will always result in a 61% solid of the former volume.
My advice is to find a suitable epoxy with >61% filler, something that retains maybe 95% volume.
RE: Epoxy Shrinkage Problem
Regards Dielectric Strength..this can be significantly increased or decreased depending on the type of filler used.
If non-metallic fillers are used SiO2, Barytes, etc...the dielectric strength can be as high as 35-40 KV/mm.
Mechanical Strength can depends...Compression increases on increased loading ..however Shear strength and tensile & flexural strength reduces.