Standard specification for Poly(Vinyl Chloride) (PVC) Pressure-rated pipe (SDR Series)
SDR is a pipe's Standard Dimension Ratio (also known as Dimension Ratio) and describes the minimum wall thickness of pipe and fittings. SDR is equal to the average outer diameter divided by the minimum wall thickness. The lower the SDR, the thicker the wall and thus the stronger the pipe.
Excalibur I.P.S. Pressure PVC Pipe conforms to ASTM D2241 for standard dimension ratios and is available in SDR 41 (100 psi), SDR 32.5 (125 psi), SDR 26 (160 psi), SDR 21 (200 psi) and SDR 13.5 (315 psi). PVC compounds used in the extrusion of this pipe meet or exceed the requirements of ASTM D1784 cell class 12454.