As early as 24,000 BC, animal and human figurines were made from clay and other materials, then fired in kilns partially dug into the ground. ... General Comparison of Materials Property Ceramic Metal Polymer Hardness Very High Low Very Low Elastic modulus Very High High Low   High Temperature Strength Thermal Expansion High Low Very Low Ductility Low High High Corrosion resistance High Low Low Wear resistance High Low Low Electrical conductivity Depends on material High Low Density Low High Very Low Thermal conductivity Depends on material High Low Magnetic Depends on material High Very Low...

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