Poisson's ratio
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Poisson ratio is one of the important criteria to be considered in pipe selection where the system may be subjected to sub-atmospheric pressure (e.g. Siphonic drainage systems). In general, a lower value in Poisson ratio provides better strength against collapse of pipe due to sub-atmospheric pressure.
In evaluating the limiting or maximum pressures, forces and deflections on plastic pipe, fittings and components covered by this standard, the material properties listed in Table 8.1 are assumed at an operating temperature of 20°C (68°F).
| Table 8.1: Material Properties at an Operating Temperature of 20°C (68°F) |
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