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Materials used in polyethylene gas systems are required to meet the following: * Hydrostatic design stress and hydrostatic design basis rating with the Plastics Pipe Institute (PPI); * Hydrostatic Design Basis Substantiation 50 years; * Material properties test according to ASTM D3350 for density, melt index, flexural modulus, tensile strength at yield, slow crack growth resistance, hydrostatic strength classification, color and UV stabilization; and * Rapid Crack Propagation (RCP) in accordance with ISO 13477 or ISO 134780.
NSF/ANI Standard 14 requires materials for pressure pipe applications meet a minimum 50-year long-term strength requirement established through PPI's hydrostatic design stress.
The final two numerals in the term refer to the hydrostatic design stress (HDS) for that material in units of 100 psi with any decimal figures dropped.