Carboxymethyl Cellulose or CMC for short; CMC is obtained from the source of analyte, softwood pulp or cotton linter (seed). It is widely produced and sold in granular and powder form.
Use of CMC in the ceramic sector;
CMC is used in ceramic glazes due to the following properties
CMC is generally used in glazes at a rate of 0.3-0.5%
1- It is either added to the mill with the raw material at the beginning to prevent the glaze from collapsing, or it is opened and added to the boiler later
2- CMC is used to increase the glaze binding. In order for the homogeneous structure of the glaze not to change, the glaze must be bound within itself.
3- CMC is used to reduce the flow of the glaze and for the surface smoothness of the glaze.
4-CMC is used to ensure that the glaze dries slowly
5-CMC is used to increase the viscosity of the glaze, i.e. to reduce its fluidity
HOW TO USE CMC
CMC is a water-soluble material. To add later, 2 gr powder CMC (2%) is added to 100 gr water slowly, stirring gently so that it does not clump
Preferably, CMC will open faster in hot water.
It should be opened until there are no particles left in the container and it must be filtered through a 150-200 micron coarse sieve before use.
Since CMC is a sensitive material, it would be correct to prepare it when it is to be used. Its binding property decreases as it is waited.
Since CMC is an organic material, it burns at 200-250 degrees and is removed from the body, and therefore it does not create stains or errors on the glaze surface. It only facilitates the application of the glaze during application and reduces errors.
The binding feature and the high effect of CMC used in ceramics depend on the length of the chain length of CMC and the degree of clustering. As the chain length increases, CMC (50) is more effective, and as it decreases, it (20) is less effective.
CMC is used in many sectors (Textile, Food, Cosmetics, Detergent, Medicine, Ceramics etc.) and the quality and structure of CMC used for each sector is different.
STORAGE;
Since CMC is a product affected by water, it should not be brought into contact with water. When it comes into contact with water, it sticks together and becomes unusable.