Basins are made of sanitary ceramic, which during the production process are heated to about 1200 degrees Celsius. They have a smooth, scratch-resistant, glazed surface that is resistant to chemicals, with the exception of very strong acids and strong alkali. Sanitary ceramic basins are in addition to being easy to clean and care for, absolutely light fast.
The ceramic basins are made basically of clay, kaolin and quartz, and are “alive” in the manufacturing process, which means that minor *distortion and warping may occur. Also the length measurement can be influenced and the tolerance level is plus/minus 2% of the basin's total length.