How we work
An overview of the processes.


Step 01

Moulding of the model

In order to create the positive wax model, a negative mould must first be created. This is made from several layers of silicone applied with a brush. If the original is not to be cut up, the mould is created in several sections so that there are no undercuts. Plaster support shells are created as an outer skin to keep the silicone in shape. These are reinforced with iron depending on the size of the model.
Step 02

Create a wax blank

A wax blank must be created for each casting. The first layers are always applied by hand with a brush. All silicone moulded parts are then connected and poured with hot wax. During cooling, a wall thickness is created that also represents the later casting thickness in the metal. The excess wax is poured out again to form a cavity. Wax retouch is carried out by the caster or the artist himself. Here, the parting seams are neutralised and any air bubbles etc. are closed. It is also possible to make small corrections to the surface in comparison to the model.
Step 03

Lost wax process

In the lost wax process, the wax model is covered with the ceramic moulding material, melted in the oven and then burnt out. The hot metal is poured into the resulting cavity. The casting shell is then removed and the work of art is exposed.
Step 04

Sand casting process

Sand casting is a proven technique for reliefs, inscriptions, coats of arms and small sculptures without undercuts.
Step 05


Chiselling is a very important step in the production of a bronze. The individual cast parts are welded together, parting seams are removed, holes caused by the casting process are sealed in order to remove the fireclay core, and then finished with specially manufactured tools such as punches and chisels. Artistic understanding is required for this work. The artists' ideas are realised in the best possible way. The surfaces of the works can range from cast-grey, ground, brushed to polished, each with its own unique character.
Step 06


Patination is the final step in the realisation of an artistic work. The patiniser anticipates the natural process of oxidation. Depending on the influence to which the copper alloy is exposed, the bronze changes colour over time. In direct cooperation, the artist's idea of the colour nuances of the patination must be precisely matched and implemented. Strassacker has a unique variety of traditional formulas for patination solutions at its disposal.
Step 07


We will transport your work for you, if necessary in co-operation with a specialist company. We will be happy to carry out the assembly on site for you so that the work can be set up safely and professionally on site.