Lead and Cadmium Dissolution Standard for Ceramic Tableware

Lead and cadmium dissolution standard for ceramic white porcelin dinnerware The dissolution rate of lead and cadmium is an important safety and health index for ceramic products. The presence of lead and cadmium is caused by the components contained in the ceramic pigments in the decorative patterns on the surface of the product. The presence of lead may also be caused by the addition of lead components to reduce the firing temperature of the surface glaze of the product. If the production process is not properly controlled, it is very easy to cause excessive dissolution of lead and cadmium during use. Frequent use of such products can easily cause lead and cadmium heavy metal poisoning. The national standard GB12651-2003 'Allowable Limits of Lead and Cadmium Dissolution of Ceramic Products in Contact with Food' is a national compulsory standard, and its scope of application covers all daily-use ceramic eating utensils. The standard stipulates that the leaching amount of lead and cadmium in any single product is not allowed to exceed the specified allowable value. Among them, flat products (products with a depth of less than 25mm from the lowest surface inside the product to the horizontal surface of the mouth) are specified as: lead leaching amount 7mg/l, Cadmium dissolution amount 0.50mg/l; small hollow products (products with a depth of 25mm or more from the innermost surface of the product to the horizontal surface of the mouth edge, and the capacity is less than 1.1L) The specified values u200bu200bare: lead dissolution rate 5.0mg/l, cadmium dissolution rate 0.50mg/l; large hollow products (products with a depth greater than or equal to 25mm from the innermost surface of the product to the horizontal surface of the mouth edge, and with a capacity greater than or equal to 1.1L) The specified values u200bu200bare: lead dissolution rate 2.5mg/l, cadmium dissolution rate 0.25mg /l.

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