GB/T 42413-2023 PDF in English
GB/T 42413-2023 (GB/T42413-2023, GBT 42413-2023, GBT42413-2023)
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| GB/T 42413-2023 | English | 125 |
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Glassware -- Test method for freezing resistance of glass containers
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Standards related to (historical): GB/T 42413-2023
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GB/T 42413-2023: PDF in English (GBT 42413-2023) GB/T 42413-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 81.040.01
CCS N 64
Glassware - Test Method for Freezing Resistance of Glass
Containers
ISSUED ON: MARCH 17, 2023
IMPLEMENTED ON: OCTOBER 1, 2023
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 Reagents or Materials ... 5
6 Instruments and Equipment ... 5
7 Samples ... 6
8 Test Procedures ... 6
9 Test Report ... 7
Glassware - Test Method for Freezing Resistance of Glass
Containers
1 Scope
This document describes the test method for the freezing resistance of glass containers.
This document is applicable to the test of the freezing resistance of glass containers in the
glassware field.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 35599 Laboratory Glass and Glassware Outward Defect Terms
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 temperature uniformity
Temperature uniformity refers to the maximum value of the temperature difference between the
central point of the water bath kettle (or water bath) and the operating space of the cryogenic
test equipment and any other point in the operating space.
3.2 temperature fluctuations
Temperature fluctuations refer to the temperature variation of any point in the water bath kettle
(or water bath) and the operating space of the cryogenic test equipment within a certain period
of time.
4 Principle
Place the sample in a low-temperature environment and maintain for a certain period of time.
Then, take the sample out and place it in an environment at room temperature or a certain
NOTE: the total volume of test samples refers to the sum of the volumes of all samples when each
sample is regarded as a solid body.
6.2 Cryogenic Test Equipment
The cryogenic test equipment shall comply with the following requirements:
---Temperature adjustment: the temperature of the freezing chamber can be adjusted to
50 C or at least 5 C lower than the test temperature;
---The temperature accuracy shall not be lower than 0.1 C, and the temperature uniformity
shall not exceed 2 C;
---The temperature fluctuations shall satisfy that the temperature fluctuations at any point
in the operating space of the cryogenic test equipment are within 2 C.
7 Samples
7.1 The surface of the test samples shall be free from obvious glass defects and dirt, and without
other debris.
7.2 The outer surface of the samples shall be dry.
8 Test Procedures
8.1 Sample Preparation
8.1.1 Conduct the inspection in accordance with the stipulations of GB/T 35599. Select samples
without obvious glass defects as the test samples. When inspecting the appearance of the
samples, gloves shall be worn to avoid touching the samples directly with hands.
8.1.2 Remove the dirt or other debris on the samples, and let them stand at room temperature
for more than 30 min.
8.2 Gradient Freezing Method
8.2.1 Inject 1/3 ~ 1/2 nominal volume of the test water (5.2) into each sample; the outer surface
of the samples shall maintain dry. Put the samples containing the test water into the sample box
(5.1), and maintain the samples upright and separated from each other to avoid mutual collision.
8.2.2 Put the samples, together with the sample box, into the freezing chamber of the cryogenic
test equipment (6.2), and start cooling. Firstly, lower the temperature of the freezing chamber
to 20 C, control the temperature of the freezing chamber within 20 C 2 C, and maintain
for 2 h. Then, continue to cool, adjust the temperature of the freezing chamber to the test
temperature, control the temperature fluctuations within 2 C, and maintain for 22 h or the
specified time.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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