At a big home store today, all the black drain pipe was 'cellular core ABS' in 'schedule 40'. What does the 'cellular' mean? The pipe was very inexpensive.
Plumbing Pipe Types – What is Cellular Core or Foam Core ABS Pipe?
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Best Answer
What you have is not solid. There's a foam or cellular interior to the pipe with two thin layers of sold ABS on the outside.
Here's a picture from a pipe vendor, where the foam core has been made white to show the detail. The pipe I've seen in stores all has a black core that mimics solid pipe at first glance:
Look around you'll see various opinions on the stuff. Some plumbers say they love it because it brings them repeat business. The vendors all claim various advantages to the pipe.
It's definitely not good in freeze/thaw weather if the ends are exposed (as they might be for a drain waste vent, or the end of a drain pipe run).
Foam core is regulated by ASTM F-628 Foam Core, and ASTM D-2661 for solid pipe.
Here's video on bursting of such pipe: https://www.youtube.com/watch?v=tWoTGu5s1Ys