I. Class
Laboratory mixers
From 0.1 to 5 litres. Trial batches, recipe work, material studies under vacuum or inert gas.
Read the specification
Anno 1863 · Hardheim, Odenwald
Stoffkunde.
The science of materials.
For one hundred and sixty three years, Maschinenfabrik Gustav Eirich has answered one question. How does a pile of grains, dust and liquid become a usable material. The answer lives in a single patented principle, and in a hall of test mixers in a small town in the Odenwald.
Plate I · Keyvisual, Hardheim test hall
Photographed at Maschinenfabrik Gustav Eirich, Walldürner Straße 50.
§ II
Three classes
of apparatus.
The right mixer for every requirement. From the first trial batch on the bench to the twelve cubic metre production unit, the Eirich drawing stays the same. Only the diameter changes.
II. Class
Small scale mixers
From 40 to 500 litres. Pilot production and development lines, scaled from the same drawing.
Read the specification
III. Class
Large scale mixers
From 1,500 to 12,000 litres. Gigafactory throughput, foundry lines, refractory preparation.
Read the specification§ III · The mixing principle
One pan.
One tool.
Two directions.
An inclined pan turns in one direction. Inside it, an eccentrically positioned rotor turns in the other. Two independent motors, two independent speeds, one encounter at the point where the tool meets the wall of material.
Because the pan carries the charge and the tool does the work, tip speeds reach forty metres per second without bruising the grain. Energy is dialled by the operator. The same drawing resolves from a tenth of a litre to twelve thousand.
The principle was patented in 1903 and has been refined, never replaced, since.
Plate II · The counter rotation principle
Patent DE 146 792, granted Hardheim, Anno 1903.
§ IV · Anwendungen
Industries
at a glance.
Every material that crosses the Hardheim threshold is measured, mixed and documented. The short index below points to the rooms where the work is done.
Refractories
Feuerfest
Batteries
Zellchemie
Metal and metallurgy
Metallurgie
Turnkey plants
Anlagenbau
Vacuum processing
Evactherm
§ V · From the house journal
Recent dispatches.
04/02/2026 № 1
Eirich brings movement to processes. interpack 2026
At interpack 2026 in Düsseldorf, Eirich will present cutting-edge solutions for the food and pharmaceutical industries from May 7 to 13.
03/10/2026 № 2
New pricing structure for wear parts thanks to more efficient processes
Eirich will be adjusting the prices for its original wear parts worldwide from March 2026 and strengthens service business
01/27/2026 № 3
Elementary forces, precision processes. Ceramitec 2026
At ceramitec, the leading international trade fair for high-performance ceramics, to be held from March 24 to 26, Eirich will be presenting holistic solutions for technical ceramics.
§ VI · Messetermine
Where the house
will be next.
The short calendar below lists the trade fairs where Eirich engineers will be present in the coming weeks. An appointment can be arranged by letter in advance.
14 April · MMXXVI
CastExpo / MetalCasting
04/14/2026
20 April · MMXXVI
Freiberger Feuerfestsymposium
04/20/2026
23 April · MMXXVI
Österreichische Gießereitagung
04/23/2026
05 May · MMXXVI
Ceramics Expo
05/05/2026
§ VII · Worldwide presence
A letter
reaches us on
every continent.
From the Odenwald workshop a network of subsidiaries, agents and service engineers extends across Europe, the Americas, Asia and Africa. The principle travels. The drawing does not change.
Write to HardheimColophon
Bring the material.
We will mix it.
A letter to the house is answered within two working days. The first round of trials takes four to six weeks and ends with a protocol you take back to your operations team.
Write to Hardheim