Fusible Pipe (DR)

This specification covers polyethylene pipe made in standard thermoplastic pipe dimension ratios and pressure rated for water at 73.4°F. Pipe manufactured under this specification is based on a controlled outside diameter. For a given nominal size, the outside diameter will be constant regardless of the pressure rating.

Pipe manufactured to this specification is described using a prefix-diameter ratio. The prefix for ASTM D-3035 is DR. It is still common to refer to ASTM D-3035 pipe as SDR as that was how the ASTM used to describe it. They removed the "S" in hopes of clearing up the confusion between it and ASTM D-2737 CTS tubing. It did not. Some also call pipe made to this standard ductile iron pipe size or D.I.P.S.