Sodium Carboxymethyl Cellulose or CMC
Sodium Carboxymethyl Cellulose, or CMC, is an organic additive derived from cellulose, widely used in ceramics due to its highly versatile properties. This compound is mainly used to improve the plasticity, cohesion and workability of clay bodys, which facilitates the formation of more consistent and easier to handle pieces. When incorporated into clay bodys, CMC helps to improve water holding capacity and flexibility, preventing the pieces from cracking or deforming during the drying process.
In glazes and engobes, CMC plays a key role in viscosity control, allowing for a more precise and uniform application of coatings. Because of its ability to increase viscosity, it prevents glazes and engobes from becoming too liquid or slipping off surfaces. In addition, CMC helps to maintain the suspension of particles in the slips, preventing them from settling, which ensures greater consistency in the mixture during the application process.Interesting Fact
CMC is not only used in ceramics, but also in the food industry as a stabilizer and thickener in products such as ice cream and sauces.Helpful Tip
Use CMC sparingly in your engobes and glazes, as too much can make the material too thick or sticky. If you are looking for a uniform application without bubbles, CMC is an excellent additive to achieve this.
