Cast iron elbow SML 80/45 (hubless grey cast iron) 13875

System of hubless cast iron pipes for sewage installations

The SML system is a modern solution for gravity sewage and drainage installations inside buildings, made of hubless grey cast iron. Pipes and fittings are connected using special pipe clamps (sleeves, couplings, joints), which enables rapid installation without the need for welding or threading.

Cast iron, as a material, is characterized by high density and natural vibration-damping properties, resulting in almost silent wastewater flow. The system meets the requirements of DIN 4109 and VDI 4100 standards regarding acoustic protection of buildings.

Construction and advanced protective coatings

Elbows are made of grey cast iron with flake graphite, which provides an optimal balance between strength and ease of processing. The external surface is covered with a red-brown primer with a thickness of 40 μm, which can be additionally coated with standard colored lacquer or a coating composition.

A key element is the internal coating of fully cross-linked epoxy resin in an ochre (yellow-brown) color with a thickness of 120 μm, applied by spraying. For fittings, the process involves immersion coating of the internal and external surfaces, followed by 45-minute curing at a temperature of approximately 180°C. This results in a high-strength bond between the fitting and the coating.

Performance properties and safety

The SML system offers comprehensive fire protection - the products are non-flammable and non-combustible (class A2 according to EN 13501), and non-toxic (no generation of smoke or flammable materials). In the event of a fire, they maintain functionality for many hours, preserving the impermeability of the walls to flames and gases, as well as the integrity of wall penetrations.

The epoxy coating provides thermal resistance up to continuous operating temperatures of 80°C and chemical resistance within a pH range of 2 to 12 (at temperatures up to 50°C). The smooth internal surface creates favorable conditions for wastewater flow and provides high abrasion resistance.

Regulatory compliance and certification

The products meet the requirements of the EN 877 standard for cast iron pipes and fittings for building drainage systems and hold quality certificates according to the following standards:

• DIN 19522 (supplementary standard to EN 877)
• RAL-GZ 698 (quality mark with significantly extended inspection scope)
• CE marking according to the EU Construction Products Directive

The system is manufactured in accordance with ISO standards for quality management (ISO 9001:2008), environment (ISO 14001:2009), and occupational health and safety (BS OHSAS 18001:2007).