Rigid Nonmetallic Regular VS Cellular Core

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yesterlectric

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PA
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Electrician
Does anyone know what the real difference is between rigid nonmetallic PVC conduit and rigid nonmetallic cellular core PVC conduit? I have only rarely seen cellular core specified and of the times I’ve seen it specified I’ve noticed contractors don’t use it. According to the UL white book, cellular core is DZLR and non-cellular core is DZYR. They both can be UL listed and they both are intended for installation with article 352. And according to the white book, there’s only a few times there’s a difference in allowed use or ratings of either of the two of them. So what is the difference between the two in terms of advantages and also ratings?

I get the sense that cellular core might be more commonly used by utilities because while it can be listed a number of manufacturers offer it in a non-listed option. But if it is listed, what would be an application where it might not be allowed to be used in the same condition that the more commonly available regular PVC is allowed to be used?
 
Cellular core is lighter weight. I have not seen it in PVC but its common in ABS plumbing. PVC prices are up, whats the cost difference?
 
This is new to me as I never knew that there was an electrical version of foam core PVC. In my area all of the DWV PVC is foam core though. Given that foam (or cellular to be more technically correct) core uses less material to manufacture one would think this would be a common thing for electrical yet I have never seen it. Am I missing something here?
 
Ok now I remember, when foam core PVC was added to the NEC I had Carlon send me a sample to show in my classes.
 
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