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Ceramic clay "Black stone" no. 27 (1000-1250°C)

050148

Grey stoneware No. 27 has the trade name „Black stone“ and is a special effect material. It contains 25 % of distinctive black fireclay in the size range of 0,5 – 2 mm.


Basic price for purchase of 10–990 kg per quality.

10% discount for purchases from 1 tonne per quality.


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Grey stoneware no. 27 has the trade name "Black stone" and is a special effect material. We introduced this material to our market in 2015 as a new product in our range. It contains 25% of distinctive black chamotte in the size 0,5 - 2mm. Due to its qualities, the clay is suitable for the production of medium to large products using all techniques. It is particularly interesting to wash the black chamotte with a sponge and then decorate it with a coating or transparent glaze. Another advantage is the interesting profile of the glaze detail due to the black colour of the chamotte. The quality of the clay as well as the packaging corresponds to the high standard of all German Witgert ceramic clay.

Witgert masses are well packed in a strong PE bag secured with an aluminium clasp. They can be easily transported and the clasp on the packaging can be re-closed with pliers when the required quantity is removed. Witgert ceramics are produced using wet or semi-dry technology (flakes). They are not made from dry powdered or granulated mixtures, thus avoiding the hardening that is common with such materials, which occurs after a certain period of storage even without breaking the packaging.

For long-term storage of our ceramic clays, we recommend placing them in a low-heated area (garage, basement, etc.) without the risk of freezing, put them in a black bag and tie them up. The absence of light will prevent the formation of mould. Stored in this way, the materials have a virtually unlimited shelf life.

Data sheet

Formplastic
Recommended firing1000 - 1250°C
Chamotte content25% of chamotte size 0,5 - 2,0 mm
Type of matterspecial
Colourlight grey to dark grey
Shrinkage during drying5,2%
Firing shrinkage by 1000°C1,0%
Firing shrinkage by 1100°C3,3%
Firing shrinkage by 1200°C4,5%
Firing shrinkage by 1300°C4,8%
Water absorption by 1000°C12,9%
Water absorption by 1100°C8,5%
Water absorption by 1200°C4,5%
Water absorption by 1300°C4,0%

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