The basis - cast iron

Düker manufactures ideas and products - for our own sale or to customer specifications - primarily out of this particular material which combines properties such as tightness, low maintenance costs and long product life for various fields of application.
In Karlstadt we use grey cast iron with finely distributed flake graphite (EN-GJL-150 to 300). In Laufach in contrast we use ductile cast iron in various qualities (EN-GJS-400-15; EN-GJS-400-18; EN-GJS-500-7; EN-GJS-600-3; EN-GJS-700-2). Individual parts to customer requirements can also be produced out of nonferrous metals.
For manufacturing these products, DÜKER uses machines developed by the engineering department in Karlstadt. The heart of the factory are the cokeless cupola furnace - powered by natural gas which is an energy-saving and environmentally friendly alternative - as well as the centrifugal casting machine based on the hot mould procedure and an automatic casting facility. Model making, moulding lines, core making facilities, foundries, finishing shop and last but not least the surface protection guarantee the process safety as well as the production in accordance with customer requirements.

Enamel - the speciality

That precious glass—enamel—is made in several stages from quartz, feldspar, borax, soda and metal oxides with the help of heat and pressure.

Contrary to coatings, the process of enamelling produces a chemical bond between the surface protection and the base material. Enamel gives our products incomparable properties, such as robustness and scratch resistance. Furthermore, this surface protection is distinguishing itself by permanent resistance to corrosion, diffusion, wear, abrasion, incrustation and deposits of all kinds.