This standard specifies the instruments, equipment, measurement steps and result calculation used in the determination of water absorption of daily-use ceramics by vacuum method and boiling method. This standard is applicable to the determination of water absorption of daily-use pottery, stoneware and porcelain. GB/T 3299-1996 Determination of water absorption of daily-use ceramics GB/T3299-1996 Standard download decompression password: www.bzxz.net

GB/T3299-1996
This standard is revised with reference to the relevant provisions of the American Society for Testing and Materials standard ASTMC373-77 Test method for water absorption, bulk density, apparent porosity and apparent specific gravity of fired ceramic products. ASTMC373-77 is adopted in a non-equivalent manner. In addition to the editorial revision of GB3299-82 in accordance with GB/T1.1-1993 Standardization Work Guide Unit 1: Rules for drafting and expressing standards Part 1: Basic provisions for the compilation of standards, this standard has been changed in the following chapters: - Added Chapter 1 Scope. - Revised the sampling provisions in Chapter 4, from grinding off the glaze layer of the sample to directly testing the sample with the glaze layer. - In the calculation of the test results in Chapter 6, the conversion coefficients of various types of porcelain are added through a large number of verification tests. Added the relevant contents of the test report in Chapter 7. From the date of implementation of this standard, the original GB3299-82 "Determination method for water absorption of domestic ceramic ware" shall be invalidated. This standard is proposed by China Light Industry General Association. www.bzxz.net
This standard is under the jurisdiction of the National Ceramic Standardization Center. The responsible drafting unit of this standard: China Light Industry General Association Ceramics Research Institute. The main drafters of this standard: Cheng Guoan, Tong Yuying, Zhang Jianping. 11
1 Scope
National Standard of the People's Republic of China
Determination method for water absorption of domestic ceramic ware
Standard test method for water absorption of domestic ceramic ware
GB/T3299-1996
Replaces GB3299-82
This standard specifies the instruments and equipment used for the vacuum method and boiling method to determine the water absorption of domestic ceramic ware, the determination steps and the calculation of the results. This standard is applicable to the determination of water absorption of domestic pottery, porcelain and porcelain. 2 Definition
The ratio of the mass of water adsorbed by the open pores of a daily-use ceramic sample to the mass of the dry sample is called the water absorption rate of the sample, expressed as a percentage. 3 Test instruments and equipment
3.1 A balance with a sensitivity of 0.001g.
3.2 An oven table with a temperature difference that can be controlled at 5C.
3.3 A set of vacuum devices with a vacuum degree not less than 0.095MPa. 3.4 A set of boiling devices.
3.5 A dryer with color-changing silica gel.
3.6 Distilled water.
A piece of cotton cloth.
4 Sampling regulations
4.1 Glaze grinding method (arbitration method)
4.1.1 Three products of the same type, take two samples weighing about 10g from the bottom of each product to form three groups. In case of special small samples, six pieces are required.
4.1.2 Grind off the glaze layer on the surface of the sample, and try to make the total surface area of ​​each sample close, flatten the edges and corners, and rinse it clean. 4.2 Unglazed method
4.2.1 Three similar products, take two samples weighing about 10g from the bottom of each product to form three groups. In case of special small samples, six samples are required.
4.2.2 When sampling, try to make the total surface area of ​​each sample close to equal, remove sharp edges and corners, and rinse it clean. 5 Test steps
5.1 Dry the sample to weight, weigh G (± 0.01g). Place the 6 samples in the vacuum device at intervals (the sample is required to be suspended), and after the vacuum reaches 0.095MPa, slowly inject steam water into the vacuum container until the water level is 10mm higher than the highest point of the sample, and maintain the original vacuum for 1h.
Or place the sample in a container of distilled water (samples are required to be separated from each other) and boil for 3 hours. During the boiling period, the water level should be kept 10mr# higher than the sample.
GB/T3299-1996
5.2 Use a cloth saturated with water to remove the water attached to the surface of the sample, and quickly weigh it on a balance as G (±0.001g). 6 Calculation method
6.1 The grinding shaft sample is calculated according to formula (1), and the unglazed sample is calculated according to formula (2). Gi= Ge × 100
Gr- Ge × 100
W is the water absorption rate of the sample, %
G—dry mass of the sample+,
G is the mass of the sample after saturation
conversion coefficient, which is determined according to different types of porcelain: daily white porcelain is 4.0, daily celadon is 2.5, daily shortware is 2.0, and daily fine pottery is 1.2.
6.2The arithmetic mean of the tested samples is taken as the test result. 7 Test report
a) Sample sending unit, sample name and sample sending date; b) Sample quantity, test method and test conditions; c) Water absorption rate of each sample and the arithmetic mean of water absorption rate of the tested samples; d) Determination date and tester.
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