Soft porcelain and hard porcelain are generally unfamiliar terms. They are two types of ceramics classified from the perspective of physical properties and manufacturing technology, and have also witnessed the long growth process of porcelain. How to distinguish hard porcelain from soft porcelain in terms of performance and appearance?
1. Different firing temperatures
Hard porcelain refers to porcelain fired at a high temperature of more than 1300 degrees Celsius, also known as high fire porcelain; Soft porcelain with low firing temperature.
2. Different performance
Hard porcelain, with high glaze hardness, high mechanical strength, good chemical stability, thermal stability and electrical insulation performance; Soft porcelain has relatively low hardness and is much weaker than hard porcelain in chemical stability, thermal stability and electrical insulation.
3. Different glaze colors and knocking sound
Hard porcelain, with high strength and density, smooth glaze and greatly improved transparency of glaze, sounds like a flood of bells; Soft porcelain, low carcass strength, low glaze finish, low glaze hardness, low glaze transparency, low whiteness and dull knocking sound.
4. Different glass contents in embryos
Hard porcelain, low content of alkaline oxide. The glass in the finished hard porcelain body after firing is relatively low. For soft porcelain, the solvent composition in the green body is less and the firing temperature is relatively low, so the glass content in the green body is relatively high.