We are a developer, enamel pioneer and system supplier with a commitment to quality
Your reliable partner whenever efficiency must go hand in hand with safety
Since 1969 we have been a passionate developer, enamel pioneer and system supplier committed to premium quality. Our aim is to offer our customers optimal functionality and safety, as well as clear customer benefits in the field of technical enamel.
On this basis we are able to consistently provide the best solution, technically and financially, for complex and demanding projects and to implement them successfully. We consider ourselves a system provider and offer our customers not only high quality products, but also comprehensive solutions from a single source. In this function we will, if you wish, take on all the necessary tasks from engineering, to procurement, construction and assembly.
Customers also benefit from our many comprehensive services, such as testing, maintenance and repair of existing valves and fittings, or training your staff to use our products and systems safely and economically.
With this strong portfolio, combined with our many years of experience and comprehensive expertise, we strengthen our customers’ market position and ensure the sustainable development of our company for the benefit of our employees and partners.
Although much has changed since our company was founded, our commitment to quality, our passion for technical enamel and our pioneering spirit remain the same.
Our story began with a mine
The Düker company began in 1469 with a mine near Laufach, where we are still based today. The oldest written mention of this mine is dated 2 August 1469. So our industrial roots go back over 550 years.
In 1923, Friedrich Wilhelm Düker brought the skills for enameling “large objects”.
The technical enamels business sector was born
In the late 1960s, the company developed its expertise in highly acid resistant enameling. The ‘enamel technology’ division was born in the Laufach plant and developed into an important and very successful company pillar.
In 2004, the Düker family sold the company to a group of private investors. ‘Eisenwerke Fried. Wilh. Düker’ was renamed ‘Düker GmbH’.
Düker email Technologie GmbH was founded
The TE Technical Enameling division was spun off from Düker GmbH in 2018.
Düker Email Technologie GmbH was created. Since mid 2019, DDüker Email Technologie GmbH has operated as an independent company, both in financial and organizational terms. The eventful company history of Düker is part of our identity, an important part of our roots. It is with great pride and enthusiasm that we now continue to write this story under a new name.
Manufacturing + quality
Enamel expertise that have been developed and passed on over decades.
Highly acid resistant enamel is an incomparable and unbeatable material. It combines all the material properties that you need for carrying sensitive or aggressive media. The high resistance and extremely smooth surface offer decisive advantages and many application possibilities.
Our enamels are the result of practice-based development work and decades of experience. A strict 100% quality control throughout the production process also ensures the consistently high standard of our products.
It begins with the processed steel. We use only high quality carbon steel from our longstanding and certified suppliers. The quality is continually analyzed and strictly monitored. We place equally high demands on the welding materials, because our precise production processes do not accommodate material variations.
Enameling pipeline parts, fittings and columns requires a very high level of expertise, experience and care, which is only possessed by an enamel specialist like Düker Email Technologie. Precise knowledge of the individual process steps and their impact on each of the parts is essential for guaranteeing the realization of high quality enameled products.
The enameling process has an important influence on the quality of our enamel. In the thin layer process, the enamel is applied in many layers, with each one fired at over 800 °C. This creates the optimal bubble structure in the enamel, which gives our parts their special durability.
The human factor plays a very special role in this. Because even in the 21st century, enameling is a real craft that demands a great deal of expertise and experience. Each of our enamelers learns his craft here in the company with intensive training, largely from experienced colleagues. It is two to three years before an enameler is let loose on our products. So the expertise which we’ve acquired over decades is passed on and developed further.
We can only fulfil our high standards for every part by having a highly specialized workforce. Each part is different and requires special manual dexterity and knacks. So during their career, our enamelers specialize in one product, which they get to know inside and out. This specialization ensures that the enameling process is as precise as possible. It also means that our enamelers develop a well-trained eye for the test that parts undergo after every work step.
The art of enameling is a difficult process, which is only successful with a lot of experience, know-how and quality awareness. Our parts are the best proof that we have perfected this process in our over 50 years of experience.
Development + innovation
Developing new products can mean both reconstructing existing products so that the design of a part is suitable for enamel, or completely reconstructing a product. The main objective in this is always that the new end product has the same function and is entirely interchangeable with the current one.
Examples of this include our new Duo safe flange DSF for the highest environmental requirements and absolute assembly safety, or the extension of our ground outlet valves for a permissible operating pressure of 16 bar. This was realized without needing to make external changes to the body. The lengths do not differ from the PN 10 version.
In our development department we are able to tackle chemical-technological and physical issues comprehensively.
The department is divided into the following sections:
- hot area - div. Laboratory furnace
- mechanics - sample preparation, grinding, cutting, embedding
- wet chemistry - qualitative and quantitative analyses, chemical reaction technology
- computer workstation for evaluations and physical investigations
A wide instrument-side arrangement facilitates customer-specific adjustments and new developments in enamel systems, as well as their physical-chemical characterization. This involves assessing the corrosion behavior - boiling tests in accordance with DIN EN 14483-2 "Assessing the corrosion stability of enamel against acids, alkalis and demineralized water" - but also the behavior of the enamel surface against media and chemicals provided by customers.
The physical enamel testing methods used are pore tests (high voltage test up to 20,000 V), adhesion tests (impact test), hardness measurements in Mohs and layer thickness measurements, as well as general measurements to determine the surface roughness.
Base material analysis is another key test and is used for incoming inspection and damage analysis. For example, material compositions can be analyzed using emission spectroscopy (combined with a corresponding material database), and the microstructure of base and coating materials can be analyzed (metallographic microstructure examinations).
Recording and evaluating enamel slip data, such as grain fineness according to Bayer, determining density and rheological properties (rotational viscometry) provide important key data for the accompanying quality assurance and for the new and further development of enamel slip systems.
The equipment in the hot area (high temperature oven, kiln, drying oven) makes it possible not only to prepare enamel test fires, but also to melt or remelt glass frits. The laboratory's range of services is completed by analyses of chemical processes and wastewater using photometry.
a crucial part of our company culture
We have an obligation towards the environment in which we live, as well as the economic and social needs of our employees and society. Therefore sustainability is a crucial part of our company culture. It influences the way we work every day and informs the three pillars of environmental responsibility, social responsibility and economic efficiency.
Environmental awareness is an essential part of our operational activities. Protecting the environment and consuming natural resources responsibly are not merely an end in themselves, but also secure the future of the company and the quality of life for future generations.
Using natural resources sparingly and efficiently has a direct impact on our economic success. Since 2010 we have practiced integrated and process-oriented environmental management in accordance with DIN ISO 14001. Sustainability is also a key element of social responsibility for us. We are therefore committed to respecting international human rights in our sphere of influence and rejecting any form of forced or child labor, also involving business partners. Discrimination of any type contravenes our company culture, which is committed to mutual respect and responsible cooperation.
Our commitment to social responsibility includes continually increasing occupational safety in all areas. The qualification of our staff is, in technical, methodological and social terms, an essential investment in the future to enable us to successfully meet the increasing and diverse requirements of the markets and the world of work. Long-term, economic success can only be achieved today by ensuring a high level of customer satisfaction, maximum productivity and the commitment of your own staff. Our overarching goal is therefore to maintain and expand a permanent presence on the relevant markets - in the interest of the owners and staff. A commitment to sustainability in all divisions is an essential basis for a modern company like ours.