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Cast iron is the classic material for domestic drainage pipes.Cast iron is the classic material for domestic drainage pipes.
Since 1982, the cast iron socket less pipe system has completely replaced the socket drainage pipe. A tried-and-tested pipe material, easy to handle fittings and reliable couplings provide for a space-saving, fail-safe and durable pipe system that fully meets the high demands of today’s quality of living standards and state of the art technical building requirements. At the same time, it fulfils many critical safety requirements such as sound insulation and fireproofing.Due to the high level of quality of SML systems, these cast iron pipes are used for the most important sections of pipe systems in a building’s drainage system (downpipes, collecting pipes and box-type inside rainwater drainpipes).
Specifications
- Density: Approx. 7.2 kg/dm³ (71.5 kN/m³) Tensile strength ≥ 150 MPa for fittings; ≥ 200 MPa for pipes
- Compressive strength: approx. 3 to 4 times the value for tensile strength
- Shear strength: approx. 1.1 to 1.6 times the value for tensile strength
- Crushing strength: (Peak compressive strength) ≥ 350 MPa
- Modulus of elasticity: 8•104 to 12•104 N/mm²
- Poisson’s ratio: ~(0,3)
- Coefficient of thermal conductivity: 50-60 W/mK (at 20º C)
- Heat resistance: As a system, SML complies with fire resistance class A2 and cast iron itself is rated A1 according to EN 13501 - not combustible.
- Coefficient of linear expansion: Only 0.0105 mm/mK (between 0 and 100º C), more or less similar to concrete; can be set in concrete without any difficulty.
- Chemical resistance: SML is highly resistible against domestic sewage water with a pH value between pH2 and pH12
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