GB/T 3532-2022Domestic porcelain ware (English PDF)

5.1 Water absorption

The water absorption shall not exceed 0.5% for fine porcelain products, not exceed 1.0% for common porcelain products, not exceed 5.0% for stoneware products.

5.3 Whiteness, gloss, color difference

It shall meet the requirements of Table 2.

5.4 Microwave adaptability

The heating energy is 72000 J. After the test according to 6.4, there shall be no cracking, damage, or arcing.

5.5 Refrigerator to microwave adaptability

After the test according to 6.5, there shall be no cracking, damage, or arcing.

5.6 Refrigerator to oven adaptability

There shall be no cracking or damaging, after the test in accordance with 6.6.

5.7 Resistance to mechanical washing

The mean number, which is obtained by all observers, shall not be greater than 1.

5.8 Product specification error

5.8.1 Caliber error

The error of the caliber, which is greater than 200 mm, shall be within ±1.0%. The error of the caliber, which is within 60 mm ~ 200 mm, shall be within ±1.5%. The error of the caliber, which is less than 60 mm, shall be within ±2.0%.

5.9 Appearance quality

5.9.1 The product shall not have defects, such as glaze frying, bumping, cracking- through, leakage.

5.9.3 The appearance defects of each grade of the product shall comply with the provisions in Table 3.It shall meet the following requirements at the same time, when it requires that it shall not exceed 2 defects, within 10 mm2.

6.1 Determination of water absorption

It is carried out, according to GB/T 3299.

6.2 Determination of thermal shock resistance

It is carried out, according to GB/T 3298.

6.3 Determination of whiteness, gloss, color difference

Whiteness and color difference are performed, according to QB/T 1503.The gloss is performed, according to GB/T 3295.

6.6 Determination of refrigerator to oven adaptability

It is carried out, according to GB/T 34253.

6.7 Determination of resistance to mechanical washing

It is carried out, according to GB/T 32680.

6.8 Determination of product specification error

It is carried out, according to GB/T 3301.

6.9 Determination of appearance quality

Deformation is performed, according to GB/T 3300.The defect size is performed, according to GB/T 3301.

7.1 Inspection category

Product inspection is divided into exit-factory inspection and type inspection. The number of unqualified products per 100 units (piece counting method) is used, for inspection.

7.2 Exit-factory inspection

7.2.1 The exit-factory inspection items are those specified in 5.8 and 5.9.

7.2.3 The inspected products can be batch-grouped, according to individual pieces, sets, grades, patterns, shapes, etc. It can be subdivided, if necessary.

7.2.4 The sampling shall be carried out, according to the following requirements.

7.2.5 If there are items, that do not meet the requirements in the exit-factory inspection items, it is judged that the batch of products does not meet the requirements of this document.

7.3 Type inspection

7.3.1 The type inspection items are the entire contents of the technical requirements of this document, of which the thermal shock resistance shall not be type inspected not less than once every quarter, whilst the other items shall not be type inspected not less than once every half a year. The type inspection shall also be carried out, in one of the following situations.

7.3.3 The count sampling procedures for type inspection shall be implemented, in accordance with the provisions of GB/T 2829-2002.See Table 6, for the nonconformance category, rejection quality level, determination level, nonconformance judgment number, sampling scheme of each inspection item.