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C900 is a category of SDR pipe that is the same diameter as ductile iron pipe,
as wrench said. And that's all it means.
Pipes of several different SDR ratings can be classified as C900.
SDR/14, class 200
SDR/18, class 150
SDR/25, class 100
are all classified as C900.
As you probably know, the class signifies working pressure.
SDR stands for "Standard Dimension Ratio" and refers to a ratio of wall thickness
to actual pipe O.D. To determine wall thickness you divide the actual O.D. of
the pipe by the SDR rating.
SDR/18 has an actual O.D of 6.90" (the O.D of 6" D.I. pipe)
6.90 divided by 18 equals .38"......the thickness of the pipe wall.