The term refers to the body of clay raw materials processed which is composed of a single clay danatau clay-mineral mixture to form a product. Traditional ceramic objects can be divided into two main parts: the body of clay (ceramics) and glaze. Ceramic body characteristics such as texture, porosity, plasticity, color, mechanical properties of materials are determined by the chemical composition and the microstructure of the ceramic body.
While the ceramic hardening reaction after being burned caused by the mineral transformations that are influenced by the composition of minerals, granulometri, the combustion temperature and furnace conditions. In general, there are three main categories of weight clay (ceramics) that Earthenware, stoneware, and porcelain. This classification is based primarily on the combustion temperature ceramic body. Understanding clay body formula refers to a specific formula that is composed of several types of clay or other materials that are mixed into a mass of ceramic body.
No figures indicate the percentage of clay or other materials used to prepare formula ceramic body. Examples:
In the development of the clay body formulas can be done by changing the composition or reduce other materials. A mixture of the system line (line blend) is a mixture of clay bodies are developed by mixing two similar clay. Mixing the two types of clay is done by adding or subtracting the percentage of each type of clay used to obtain some formula that qualifies for the manufacture of ceramic objects. Note the method of mixing systems in the line below:
Table 1. Mixing System line
In the diagram above, there are five mix formula as follows:
(1) Formula I, consisting of 100% clay A
(2) Formula II, comprised of 75% clay and 25% A clay B
(3) Formula III, composed of 50% clay and 50% A clay B
(4) Formula IV, comprised of 25% clay and 75% A clay B
(5) Formula V, consisting of 100% clay B.