GB/T 42413-2023Glassware - Test method for freezing resistance of glass containers (English PDF)

Foreword

This document was issued on 17 March 2023 by the State Administration for Market Regulation; Standardization Administration of the PRC and takes effect on 1 October 2023.

It is a GB/T standard: recommended rather than compulsory, but it is the text a Chinese reviewer applies when assessing a submission.

1 Scope

GB/T 42413-2023 covers the way the freezing resistance of a glass container is tested — the principle, the reagents or materials, the instruments and equipment, the specimens, the test procedure, and the test report. The principle is a thermal one: the container is held in a low-temperature environment for a set time and then moved into a room-temperature or otherwise specified environment, so that the wall of the glass has to take the change rather than the cold. That is where glass gives way, and a container that comes through the freezer intact can still crack on the bench a minute later, spilling whatever it holds and leaving fragments in it. Because the answer depends as much on the specimen and the chamber as on the glass, the terms clause fixes what temperature uniformity means, and the specimens are required to be free of obvious glass defects, dirt and other debris and dry on the outer surface, selected by an appearance inspection carried out in accordance with GB/T 35599. Written for glassware manufacturers, for laboratories qualifying containers for cold storage or frozen sample work, and for buyers who put freezing resistance into a purchase specification and need a single method behind the words.

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.