Misfire bricks

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A misfire brick is a brick that was created by a fault during firing. It usually has a poor quality, but is sometimes used deliberately in architecture because of its special look. In the case of false-fire bricks, a distinction is made between molten bricks, weak-fire bricks, expanded bricks and false-color bricks.

False color tile with footprint

Wrong color tile

False-color bricks are all false-fire bricks that have been given a different color than the original desired color during the firing process. Causes can be incorrect heating, errors during firing or cooling. The color of the bricks after firing also depends on the minerals contained in the raw material. An incorrect or uneven composition of the raw material can also lead to undesirable wrong colors.

Melt as a decorative element on gate pillars

Molten brick

Molten bricks are bricks that received too much heat during the firing process beyond what is known as the `` Garbrand ''. They melted on the surface and sometimes also in their structure.

Expandable brick

Expanded brick is a brick in which gas inclusions are still inside or gases are formed after the tight burning, the sealing of the surface. These gases expand and cannot escape. This causes the brick to expand, deform and tear. The deformation or bursting creates a brick of inferior quality. The quality of the adjoining bricks in the kiln can be impaired and lead to rejects.

Sending old bricks

Low-fire bricks

The cause of the weak-fire bricks, also soft-fire bricks, is a too low and uneven firing temperature, as it often happened in pre-industrial times when the cooking firing temperature was not reached. It is crumbly and has little compressive strength. The brick is not frost-resistant and has a high water absorption capacity. It does not have a solid structure and is prone to a variety of different types of damage such as peeling and sanding.

See also

literature

  • Federal Association of the German Brick and Tile Industry V. (Ed.): From the brick god to the industrial electronics technician - history of brick production from the beginnings to the present day, text / picture / editorial office Willi Bender, Bonn 2004, ISBN 3-9807595-1-2 .
  • Gottfried Kiesow : Not all bricks are the same . In: monumente magazine for monument culture in Germany . Issue 3/4, April 2009.

Web links

Commons : Brick Surfaces  - collection of images, videos and audio files