Düker GmbH
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Quality is a MUST

High demands on product quality, in some cases from sensitive areas of application, imply appropriate standards in all process stages, development, production and service. Düker satisfies these demands on all levels. In 1993, DükerR introduced a modern certified quality management system to EN ISO 9001. In addition, the company operates under the terms of other approvals and regulations, some of which are product or market-specific: e.g. ASME, QHD, DVGW and customers’ factory standards. Regular and random tests, internal and external audits, as well as the employees’  motivation ensure that the QM system is constantly being developed as an integral part of the organisation as a whole. This means that in the future as well, we will supply products that stand out as a result of their long useful life and comply with the latest state of the art.


Our cast iron products are made of pressure-tight cast iron for gas and water supply as well as for drainage systems. In addition we cast special parts according to individual customer requirements and offer surface processing for every component. This requires reproducible production process stages and testable quality standards.


Düker is certified according to EN ISO 9001:2008.
Process and production control by DVGW and FGR.


The Düker quality management includes:

  • Continuous training of our staff
  • Check up of raw materials 
  • Spectral analyses of materials 
  • Physical tests 
    - Tensile stress according to DIN 1563
    - Impact test according to DIN 50 155
    - Brinell hardness tests according to DIN 50351
  • Metallographic analyses
  • Ultrasound test
  • Dimensional test
  • Continuous monitoring of current processes
  • Since 1993 certified as per EN ISO 9001
  • Check up of core sand and foundry sand

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