The firing shrinkage of a clay is usually about the same as the drying shrinkage. Total shrinkage will usually be about 8-12%. The next stage that happens during the firing process is vitrification. This is the hardening, tightening and finally the partial glassification of the clay. Vitrification results from fusions or melting of the various components of the clay.
Middlesboro (local /ËmÉªdÉlzbÉrÉ/) is a home rule-class city in Bell County, Kentucky, United States. The population was 10,334 at the 2010 U.S. census, while its micropolitan area had a population of 69,060. It is located 1 mile west of the Cumberland Gap and is the largest city in southeastern Kentucky. It is located entirely between Pine Mountain and the Cumberland Mountains in the Middlesboro Basin, which geologists believe to be an enormous meteor crater (one of three known astroblemes in the state).
Middleburg is a borough in Snyder County, Pennsylvania, United States. The population was 1,382 at the 2000 census. It is the county seat of Snyder County. Native Americans had lived in the region for centuries. White settlers are recorded living in the area in 1755.