Grog (clay): Difference between revisions
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'''Grog''' (also called ''firesand'' or ''chamotte'') is a |
'''Grog''' (also called ''firesand'' or ''chamotte'') is a [[ceramic]] raw material. It is produced by firing seletec [[clay]]s to high temperature before grinding and screening to specific particle sizes. It is generally coarser in size than the other raw materials used tp prepare clay bodies |
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| ⚫ | 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. |
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It is also any material that is coarse in size compared to the finer constituents in a ceramic body. It can be any material such as clay, alumina, glass, sand, and other types of ceramic material. |
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| ⚫ | 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 |
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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. |
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. |
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Revision as of 16:04, 5 January 2007
Grog (also called firesand or chamotte) is a ceramic raw material. It is produced by firing seletec clays to high temperature before grinding and screening to specific particle sizes. It is generally coarser in size than the other raw materials used tp 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.
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