What does Standard Dimension Ratio (SDR) in PVC pipe define?

The Standard Dimension Ratio (SDR) in PVC pipe is defined as the ratio of the outside diameter (OD) of the pipe to the wall thickness. This measure is important as it provides an indication of the strength and pressure capacity of the pipe. A higher SDR indicates a thinner wall with a larger diameter, which is suitable for applications that require a lower pressure rating. Conversely, a lower SDR reflects a thicker wall and smaller diameter, typically used for higher pressure applications. By relating the OD to the wall thickness, SDR provides a standardized way to classify and compare the dimensions and performance characteristics of various PVC pipes. Understanding SDR is crucial for selecting the appropriate pipe for specific applications in wastewater management and other industries.