PVC SDR 21 is manufactured from Type 1, Grade 1 rigid polyvinyl chloride. It is produced in sizes from 3/4-inch to 8-inch diameter. The pipe is gray or white in color.
Pressure And Temperature
PVC SDR 21 has a burst pressure rating of 200 pounds per square inch (psi) at 73 degrees Fahrenheit. This pipe is designed for applications where the fluid does not exceed 140 degrees Fahrenheit.
Markings on this pipe must include the manufacturer's name or trademark, the nominal pipe size, the outside diameter, the material designation code, the standard Dimension Ratio designation code, the pressure rating in psi, the ASTM designation "D2241" and a laboratory's seal of approval for use with potable water.
SDR 21 joints should be solvent cemented when its application will involve fluids at or near maximum temperature. Threaded joint connections should not be used where fluid temperatures will exceed 110 degrees Fahrenheit.