ASTM F441 PVC Plastic Pipe test method (Hydrostatic pressure, flattening)  This specification covers chlorinated poly(vinyl chloride) (CPVC) pipes made in standard thermoplastic pipe dimension ratios and pressure rated for water. These pipes are intended for use in the distribution of pressurized liquids only, which are chemically compatible with the piping materials. Established here are the criteria for classifying both CPVC plastic pipe materials and finished CPVC plastic pipe products, as well as the requirements and associated test methods for the material, workmanship, dimensions, sustained pressure, burst pressure, flattening resistance, and extrusion quality. 

Sustained pressure

ASTM F441 Hydrostatic pressure Burst pressure  

Flattening resistance