Restrain
Iplex has developed RestrainTM PVC-U sewer pipe specifically for gravity sewer applications utilising trenchless techniques for the installation, repair or replacement of underground infrastructure. RestrainTM is a rubber ring jointed PVC-U pipe, with a threaded spigot and socket, which provides immediate axial capability during installation.
Material Properties
| Property | Value & Unit |
| Density | 1530 kg/m3 |
| Ultimate Tensile Strength | 52MPa |
| Compressive Strength | 66MPa |
| Ring Bending Modulus (3min) | 3200MPa |
| Ring Bending Modulus (50 yr) | 1400MPa |
| Hardness (Shore D) | 85 (ASTM D2240) |
| Yield Strain | 5.5% |
| Poisson's Ratio | 0.38 |
| Property | Value & Unit |
| Max Continuous Service Temperature | 50°C |
| Specific Heat | 1045 J/kg/°C |
| Thermal Conductivity | 0.138-0.150 W/m/°C |
| Coefficient of Thermal Expansion | 7 x 10-5 / °C |
| Vicat Softening Temperature | Approx. 80°C |
PVC-U pipe is non-conductive and cannot be used for earthing electrical equipment.
| Property | Value & Unit |
| Volume Resistivity | 1016 ohm.cm (60% RH) |
| Surface Resistivity | 1013 - 1014 ohm |
| Power Factor (at 20°C) | 0.015 - 0.020 |
| Dielectric Constant (at 25°C) | 3.4 - 3.6 (60 Hz) |
PVC-U pipe is suitable for service temperatures between 0°C and 50°C, it's self-extinguishing and does not support combustion when the source of ignition is removed.
PVC-U pipe should not be used for continuous service temperatures above 50°C, as deformation of the pipe may result.
PVC-U sewer pipes have good impact resistance, however at very low temperatures (eg. Below 5°C) the impact resistance of PVC-U pipes is reduced. Hence, when installing pipes at low temperatures extra care should be taken when handling and inserting.
PVC-U pipes are however installed in some of the coldest regions of Europe and North America in large quantities without difficulty.
PVC-U sewer pipes have high resistance to a wide range of chemical reagents. Such resistance, however, is a function of temperature, concentration and pressure.
In general, PVC-U is suitable to convey strong acids, alkalis and aqueous solutions (except those which are strongly oxidising), aliphatic hydrocarbons, fluorides, photographic and plating solutions, brine, mineral oils, fats and alcohols. The suitability of a pipeline for conveying a certain chemical will depend on such factors as the concentration of the chemical in the fluid to be conveyed, temperature, flow rate, the presence of pockets or "dead spots" in the pipeline and other factors.
RestrainTM sewer pipes should not be used with aromatic or chlorinated hydrocarbons, ketones, esters and ethers.