The authentic standards for ceramic tableware mainly include the following aspects:
Firstly, ceramic tableware must comply with national safety standards, including indicators such as water absorption, heat exchange adaptability, lead migration, and cadmium migration. For example, the water absorption rate of fine porcelain products shall not exceed 0.5%, ordinary porcelain products shall not exceed 1.0%, and stoneware products shall not exceed 5.0%. Small and medium-sized tableware, cups, and cups must undergo a heat exchange at 180 ℃ to 20 ℃ without cracking; Large and extra large products can withstand heat exchange from 160 ℃ to 20 ℃ without cracking. In addition, the lead migration amount of small hollow products is ≤ 2.0, and the cadmium migration amount is ≤ 0.301.
Secondly, the sensory requirements for ceramic tableware are also very important. The product should not have defects such as glaze explosion, collision, cracking, and leakage. The color should be uniform, the surface should be smooth, and the pattern should be complete without color difference or deformation. For example, underglaze and underglaze colored tableware have smooth surfaces and less vibrant colors than underglaze colored tableware, but are less prone to problems caused by friction.
Finally, the physical and chemical safety standards for ceramic tableware are also crucial. Ceramic tableware must comply with relevant national standards and must not have any obvious damage, cracks, or obvious toxin spillage. In addition, ceramic tableware needs to have good thermal stability, and sudden cooling and heating will not cause cracks or damage.
