Clay body
Clay body is the fundamental mixture of materials that forms the basis of all ceramic pieces. Composed mainly of clay, feldspar, silica and other additives, clay body is moldable and plastic when wet, allowing a wide variety of shapes and structures to be created. The exact composition of the clay can vary significantly depending on the type of ceramic to be produced, such as earthenware, stoneware or porcelain, each with its own specific characteristics and applications.
In addition to the basic components, the clay body may include non-plastic ingredients, such as sand, grog (pre-fired clay), calcium carbonate and other materials that improve the physical properties of the mass. These additives affect plasticity, crack resistance, water holding capacity and response during firing. For example, the inclusion of grog reduces the required water content and increases the strength of the dough, facilitating shaping and reducing the risk of deformation during firing.
There are different types of clay bodys, each designed to meet specific production and finishing requirements:
- Earthenware: A low- to medium-temperature clay, fired between 900°C and 1200°C, known for its durability and versatility in the production of tableware and utilitarian objects.
- Stoneware: Fired at higher temperatures (1200°C - 1300°C), it offers higher strength and lower porosity, ideal for pieces requiring durability and wear resistance.
- Porcelain: A fine, translucent clay, fired at very high temperatures (1300°C - 1400°C), recognized for its fragility, beauty and translucency, used in high quality tableware and sophisticated decorative objects.Interesting Fact
In ancient Egypt, desert sand was added to the clay body as a degreaser to improve its strength and withstand high temperatures. This method allowed the creation of durable ceramics for both everyday use and ceremonial purposes, contributing to the stability and longevity of objects that have endured for millennia.Helpful Tip
When choosing a clay body for your project, it is critical to understand the properties of each type of clay and how they interact with the additives. Experiment with different proportions of clay, feldspar and other components to adjust plasticity, strength and water-holding capacity according to the needs of your piece. Perform modeling and firing tests to find the optimum formulation that will allow you to achieve the perfect balance between workability and final durability.
