Information about Grog (clay)
Grog (also called firesand or chamotte) is a ceramic raw material. It can be produced by firing selected clays to high temperature before grinding and screening to specific particle sizes. It can also be produced from pitchers. The particle size distribution is generally coarser in size than the other raw materials used to prepare clay bodies
Grog is used in pottery and sculpture to add a gritty, rustic texture called "tooth"; it also reduces shrinkage and aids even drying. This prevents defects such as cracking, crow feet patterning, and lamination. The coarse particles open the green clay body to allow gases to escape. It also adds structural strength to hand-built and thrown pottery during shaping although it can diminish fired strength.
Other uses for Grog is processing ZnO Metal Oxide Varistor (MOV). It is put at the base of the "blocks" on the topside of the bottom of a refractory sagger to keep the blocks from sticking to the sagger. This is because ZnO MOV has a polymer binder that upon drying acts as a glue. The grog at the base prevents gluing and acts as a vent for carbon gases while drying and sintering. The grog is a gritty form of ZnO to prevent contamination.
Grog is used in pottery and sculpture to add a gritty, rustic texture called "tooth"; it also reduces shrinkage and aids even drying. This prevents defects such as cracking, crow feet patterning, and lamination. The coarse particles open the green clay body to allow gases to escape. It also adds structural strength to hand-built and thrown pottery during shaping although it can diminish fired strength.
Other uses for Grog is processing ZnO Metal Oxide Varistor (MOV). It is put at the base of the "blocks" on the topside of the bottom of a refractory sagger to keep the blocks from sticking to the sagger. This is because ZnO MOV has a polymer binder that upon drying acts as a glue. The grog at the base prevents gluing and acts as a vent for carbon gases while drying and sintering. The grog is a gritty form of ZnO to prevent contamination.
ceramic is derived from the Greek word κεραμικός (keramikos). The term covers inorganic non-metallic materials which are formed by the action of heat.
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Clay is a naturally occurring material, composed primarily of fine-grained minerals, which show plasticity through a variable range of water content, and which can be hardened when dried or fired.
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Pitchers are pottery that has been broken in the course of manufacture. Biscuit pitchers are crushed, ground and re-used, either at a low percentage addition to the virgin raw materials on the same factory or elsewhere.
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The particle size distribution[1] ("PSD") of a powder, or granular material, or particles dispersed in fluid, is a list of values or a mathematical function that defines the relative amounts of particles present, sorted according to size.
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Pottery is the ceramic ware made by potters. In everyday usage the term is taken to encompass a wide range of ceramics, including earthenware, stoneware, and porcelain. The places where such wares are made are called potteries.
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sculpture is a man-made three-dimensional object intended for special recognition as art. A person that creates sculptures is called a sculptor.
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Materials of sculpture through history
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A varistor is an electronic component with a significant non-ohmic current-voltage characteristic. The name is a portmanteau of variable resistor. Varistors are often used to protect circuits against excessive transient voltages by incorporating them into the circuit in
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