What is the difference between PP(polypropylene) and CPP?

To my knowledge, CPP means cast-polypropylene, which I've seen used in a coaxial cable. Some cables use CPP as dielectric material. My question is:

1. what is the difference between PP(polypropylene) and CPP?
2. How is CPP made?
3. Is the permittivity and loss tangent of CPP different from that of PP?

thank you. :)
 
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I've seen used in a coaxial cable.
What manufacturer and part number?
I'm familiar with PE and TFE, but have never seen coax using a PP dielectric core.
 

Baluncore

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A manufacturer makes PP core coax cable ....I learn something new every day. :)
 

rbelli1

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Considering they produce 5km reels this must be done with some type of extrusion process. Casting a 5km part would be difficult to put it mildly.

http://www.profol.com/en/about-cpp-film-faq.html

Based on the information linked above I would guess that there is a post extrusion sizing and cooling die to maintain tighter tolerances vs simple extrusion.

BoB
 

Baluncore

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Cellular polypropylene, CPP, with a dielectric constant of about 1.3 is used as a dielectric in some data cables.

Google Books.
Cable Engineering for Local Area Networks.
Barry J. Elliott. Page 94.
 

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