GB/T 42413-2023 PDF EnglishUS$125.00 · In stock · Download in 9 seconds
GB/T 42413-2023: Glassware - Test method for freezing resistance of glass containers Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 42413-2023: Glassware - Test method for freezing resistance of glass containers---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT42413-2023GB 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 ContentsForeword ... 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 Containers1 ScopeThis 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 ReferencesThe 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 Terms3 Terms and DefinitionsThe 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 PrinciplePlace 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 Samples7.1 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 Procedures8.1 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 full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 42413-2023 be delivered?Answer: The full copy PDF of English version of GB/T 42413-2023 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 42413-2023_English with my colleagues?Answer: Yes. 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