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GB/T 4736-2022 PDF in English


GB/T 4736-2022 (GB/T4736-2022, GBT 4736-2022, GBT4736-2022)
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GB/T 4736-2022: PDF in English (GBT 4736-2022)

GB/T 4736-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 81.060.20
CCS Y 24
Replacing GB/T 4736-1984
Test method for permeability gas of daily-use pottery
ISSUED ON: APRIL 15, 2022
IMPLEMENTED ON: NOVEMBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions... 4 
4 Principle ... 4 
5 Equipment and utensils ... 4 
6 Sample preparation ... 5 
7 Test procedures ... 6 
8 Test data processing ... 6 
9 Test report ... 7 
Appendix A (Informative) Dynamic viscosity of nitrogen ... 9 
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020,
“Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents”.
This document replaces GB/T 4736-1984 “Standard test method for permeability gas
of pottery ware of daily use”; compared with GB/T 4736-1984, in addition to structural
adjustments and editorial changes, the main technical changes are as follows:
-- Change equipment and utensils (see 5.1, 5.2; Chapter 2 of the 1984 edition);
-- Change sample preparation (see Chapter 6; Chapter 3 of the 1984 edition);
-- Change test procedures (see Chapter 7; Chapter 4 of the 1984 edition);
-- Change test data processing (see Chapter 8; Chapter 5 of the 1984 edition);
-- Change test report (see Chapter 9; Table 3 of the 1984 edition);
-- Add dynamic viscosity of nitrogen (see Appendix A).
Please note that some of the contents of this document may involve patents. The issuing
organization of this document is not responsible for identifying patents.
This document was proposed by China National Light Industry Council.
This document shall be under the jurisdiction of National Technical Committee 405 on
Daily-use Pottery of Standardization Administration of China (SAC/TC 405).
The drafting organizations of this document: Yixing Customs District P.R. China,
Jiangsu Tianyu Ceramics and Refractory Testing Co., Ltd., Yixing Yigongfang Zisha
Mud Research Institute Co., Ltd., Auratic Co., Ltd., Fujian Jiamei Group Corporation,
Fujian Dehua Jinfu Ceramic Co., Ltd., Fujian Dehua Quanfeng Ceramics Co., Ltd.,
Guangdong Jinqiangyi Ceramics Co., Ltd., Hanshan Normal University.
The drafters of this document: Weng Zhongliang, Yang Yongliang, Wu Yuanzhi, Huang
Weixing, Su Chenyi, Wu Xuewen, Zeng Wenchang, Lin Yiqiang, Qiu Weizhi.
The previous versions of this document and the documents which are replaced by this
document are as follows:
-- It was first released in 1984 as GB/T 4736-1984;
-- This is the first revision.
Test method for permeability gas of daily-use pottery
1 Scope
This document specifies the principle, equipment and utensils, sample preparation, test
procedures, test data processing and test report of the test method for permeability gas
of daily-use pottery.
This document applies to the determination of permeability gas of daily-use pottery
products; it can be referred to by other types of pottery products.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 3303, Terminology of defects for domestic ceramics
GB/T 5000, Terminology for domestic ceramics
GB/ T8979, Pure nitrogen and high purity nitrogen and ultra pure nitrogen
3 Terms and definitions
Terms and definitions determined by GB/T 3303 and GB/T 5000 are applicable to this
document.
4 Principle
Under the specified pressure difference, the nitrogen flow rate through the sample
characterizes the permeability gas.
5 Equipment and utensils
5.1 Air permeability tester: See Figure 1 for the schematic diagram of the equipment
connection. It consists of gas storage tank (containing high-purity nitrogen in
accordance with GB/T 8979), gas pressure gauge (0 MPa ~ 0.1 MPa, accuracy 1%), gas
flow measuring equipment (accuracy 2%), sample holder (which can hold a set of
samples of 50 mm and 25 mm in diameter), automatic measurement and control system;
than 20 cm × 30 cm. The test piece is not allowed to have defects such as incomplete
edges, visible cracks, and molten holes.
6.2 The surface layer of the test piece shall be ground with a surface grinding machine
or a surface grinder; the glaze layer and intermediate layer of the test piece with glaze
shall also be ground, until the surface of the test piece is basically flat and the thickness
is basically the same as that of the bottom of the sample. The thickness difference
between the 5 test pieces shall be less than 0.5 mm.
6.3 Use water to rinse the test piece; dry it in an electric heating drying oven at
(110±5) °C for 2 h; put it in a desiccator and cool it to room temperature of (20±5) °C.
7 Test procedures
7.1 Use an aluminum alloy cylinder for air tightness inspection; when the pressure drop
rate is less than 15 Pa/min, it is considered that the air tightness is qualified.
7.2 Measure the diameter and thickness of the test piece, accurate to 0.1 mm.
7.3 Put the test piece into the sample holder; adjust the test piece to the center position;
then, fix the sample holder on the air intake seat. If the thickness of the test piece is
insufficient, add a gasket to adjust the height to inflate the latex liner, making sure that
the pressure on the latex liner is sufficient to keep the surface airtight.
7.4 Adjust the gas path pressure reducing valve of the instrument. After the inlet and
outlet systems are stable, record the gas pressure difference, gas flow rate, temperature
and atmospheric pressure data during measurement. Measure each test piece under at
least three different pressure differences, where the ratio of the two pressure differences
before and after the increase shall be the same; calculate the permeability gas of the test
piece separately.
8 Test data processing
8.1 With reference to Darcy's law, calculate the permeability gas of the sample
according to Formula (1).
Where:
K – permeability gas of the test piece, in square meters (m2);
Q – inlet air flow through the test piece, in cubic meters per second (m3/s);
η – dynamic viscosity of the gas used at the test temperature, in Pascal seconds (Pa·s);
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.