The small silver ceramic discs in fridge compressor starters & the odd CRT Tv

I can't find the posts I made about this, someone else was wanting to know what it is & what its made of.

This is what it looks like


I have found they are actually a PTC (positive temperature coefficient)

About the fridge starters.
http://www.sensata.com/download/8ea.pdf

About the chemical thats in it.
http://en.wikipedia.org/wiki/Barium_titanate

1Kg of it is worth US$112
http://www.advancedmaterials.us/5622-ON4.htm

I'm quite happy about this post, after years of wondering what that thing is I have now found out.
It took a bit to search for info, no wonder no one else knew what it was.
Even though all the infos there on the net, there was no connection between the 3 main subjects. **** google

I have found these on low grade boards also,radios,vcr's,tv's,ect.. I have been saving them because i thought they might contain silver,but it looks like they contain titanium instead.