South Sudan Flag and Description. The flag of South Sudan was adopted following the signing of the Comprehensive Peace Agreement that ended the Second Sudanese Civil War. The flag was previously used as the flag of the Sudan People's Liberation Movement.
A ceramic is an inorganic, nonmetallic solid material comprising metal, nonmetal or metalloid atoms primarily held in ionic and covalent bonds. The crystallinity of ceramic materials ranges from highly oriented to semi-crystalline, and often completely amorphous (e.g., glasses). ceramic material is an inorganic, non-metallic, often crystalline oxide, nitride or carbide material. Some elements, such as carbon or silicon, may be considered ceramics. Ceramic materials are brittle, hard, strong in compression, weak in shearing and tension.
Ceramic tiles are any kiln-fired clay-based tiles. Porcelain tile is a specific type of ceramic tile. It is made from porcelain clay and is fired at extremely high temperatures. It is a very dense tile and virtually does not absorb water. Porcelain is the hardest and strongest commercial tile available. The average PEI rating of porcelain is 5. Non-porcelain ceramic is made from various red and white clays. It does not need to be fired at as high a temperature, and is not as durable or moisture resistant as porcelain. The average PEI range of non-Porcelain tiles is 0-3./p> What is a ceramic tile PEI rating? The PEI (Porcelain Enamel Institute) uses a 0-5 rating system for the abrasion resistance of ceramic tile: