... MethodAverage Values Thickness,mmASTM D5199 0.51.0 1.5 2.0 2.5 Density,g/cm3ASTM D792 0.94 Melting Index ... ) 1 Strength at Break,kN/mASTM D638(at 50mm/min) 14.530 40 5469 Elongation at break,%ASTM D638(at 50mm ... Water pressure resistance,MpaASTM D751 1.0 2.2 3.14.1 5.2 Coefficient of Expansion(mm degrees)ASTM D638 1 ...