Clinker from the
through a second firing in the steam kiln.
The color of the clinkers after the first firing is crucial for the final gray shade. The darker the clinkers are when they come out of the ring kiln, the darker the result after the second firing in the steam kiln.
For example, a light, cream-white firing from the ring kiln will turn into a light gray after steaming.
since 2020 with our own steam kiln in Erkelenz.
Afterward, the goods are cooled with nitrogen.
The clay materials contained in the clinker change color in this atmosphere, depending on the undertone, to grayish, bluish, or black.
No firing is like the other
The same characteristics apply to the steamed clinkers as to the ring kiln clinkers. The bricks are set by hand in the kiln and later packed by hand again. Cracks and chipped edges are always part of the appearance. Since the gray color runs through the entire clinker, it is also visible in possible cracks and chipped edges.
Coal firing marks from the firing in the ring kiln are still present after the steaming process.
To achieve a uniform facade appearance, it is important to take the clinkers from several pallets on the construction site and mix them accordingly.
Furthermore, the use of acid, especially hydrochloric acid, should be expressly avoided during processing. This can lead to discolorations on the clinker, which are difficult to remedy.
Clinker from the
We can currently deliver a wide range of gray tones. The listed clinker types can be produced with varying amounts of coal firing.
Variety and large selection
Please also note that the delivery time for gray clinker assortments is extended due to the second firing.