Profiled Backing Flange Ductile Iron GGG 40 d200-d630 PN10-16

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The Georg Fischer profiled backing flange manufactured from ductile iron (GGG 40 / EN-GJS-400-15) provides a robust, dimensionally stable connection solution for polyethylene piping systems. Specifically engineered to work in combination with PE100 and PE80 flange adaptors (stub ends) in butt fusion and electrofusion installations, this component ensures safe, leak-tight transitions between plastic pipelines and flanged equipment such as valves, pumps, flowmeters, and metallic pipeline sections. BigWeld, as an authorised Georg Fischer distributor, supplies these high-performance industrial components to meet the stringent mechanical and operational requirements of modern utility networks and industrial installations.

Corrosion protection is a fundamental requirement in buried utility and aggressive industrial environments. This backing flange is fully encapsulated in a high-grade stoved epoxy resin coating conforming to DIN 30677, providing an impenetrable barrier against soil moisture, chemical agents, and atmospheric oxidation. The precision-machined profiled contact face is geometrically optimized to match the back face of standard polyethylene flange adaptors. This profiling guarantees uniform surface pressure across the thermoplastic collar when tightening bolts, preventing stress peaks, edge loading, and notch damage that could otherwise lead to premature plastic deformation or joint failure over prolonged operational lifecycles.

Connecting dimensions and bolt hole circles strictly comply with EN 1092-1 and ISO/DIN 2501 standards, available in PN 10 and PN 16 pressure ratings across the metric dimensional range from d200 up to d630 (corresponding to nominal diameters DN200 through DN600). The ductile iron construction offers superior tensile strength and ductility compared to traditional grey cast iron, accommodating pressure surges and thermal expansion cycles in potable water distribution, industrial cooling circuits, and natural gas conveyance networks without cracking or permanent deformation.