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GB/T 1682-2014 (GB/T1682-2014)

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GB/T 1682-2014: PDF in English (GBT 1682-2014)
GB/T 1682-2014
ICS 83.060
G 40
Replacing GB/T 1682-1994
Rubber, Vulcanized - Determination of Low-
temperature Brittleness - Single Test Piece Method
Issued by: General Administration of Quality Supervision, Inspection and
Standardization Administration of the People’s Republic of
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Terms and Definitions ... 5 
4 Test Equipment ... 6 
5 Sample ... 8 
6 Laboratory Temperature ... 8 
7 Test Procedure ... 8 
8 Test Result and Processing ... 9 
9 Test Report ... 10 
This Standard was drafted in accordance with the rules in GB/T 1.1-2009.
This Standard serves as a replacement of GB/T 1682-1994 Rubber, Vulcanized -
Determination of Low-temperature Brittleness (single test piece method). In
comparison with GB/T 1682-1994, there are several main technical changes as follows:
---In order to satisfy the requirements of material testing and simplify test
procedure, test procedure B is added, namely, the method of impacting test
sample at a stipulated temperature and judging whether any fail is caused
(please refer to Chapter 1; 7.2; 8.2; Chapter 9);
---“fail” is used to replace “embrittlement” (please refer to 3.2; 3.2 in Version 1994);
---“lifting device” is used to replace “lifting poker and lifting spring” (please refer to
4.1; 4.1 in Version 1994);
---Figure 1 is re-drawn; the title and keys of the figure are added (please refer to
4.1; 4.1 in Version 1994);
---The selection of cooling mode is added, namely, in the selection of refrigerant,
except from dry ice and liquid nitrogen, other cooling modes may also be
adopted (please refer to 4.4.2; 4.4.2 in Version 1994);
---Sample thickness is modified from (2.0 ± 0.3) mm into (2.0 ± 0.2) mm (please
refer to 5.1; 5.1 in Version 1994);
---The requirement of sample temperature regulation and surface inspection
before test is added (please refer to 5.2; 5.2 in Version 1994);
---The requirement “adjust to the needed temperature, or, slightly lower than the
needed temperature, so that after sample is immersed, the temperature of
freezing medium is exactly the needed temperature” is added (please refer to
7.1.2; 7.2 in Version 1994);
---The requirement “after the impact, take down the sample, place it still for at least
30 s, then, wipe off residual liquid on the sample surface, bend it; under bright
light, observe whether the sample is failed, and record it” is added (please refer
to 7.1.6; 7.6 in Version 1994);
---The content “test report shall include detailed description and the source of
sample” is added (please refer to Chapter 9; Chapter 9 in Version 1994).
This Standard was proposed by China Petroleum and Chemical Industry Association
Rubber, Vulcanized - Determination of Low-
temperature Brittleness - Single Test Piece Method
Warning: personnel adopting this Standard shall have practical experience of
working in a regular laboratory. This Standard does not point out all the possible
safety issues. Users of this Standard shall undertake the responsibility of
adopting proper safety and health measures; guarantee the compliance with
conditions stipulated in relevant national laws and regulations.
1 Scope
This Standard stipulates the method of adopting single test piece brittleness
temperature testing machine to test vulcanized rubber’s brittleness temperature and
judging whether vulcanized rubber is failed after being impacted at a stipulated
temperature. The method includes two procedures: Procedure A is applicable to the
test of brittleness temperature; Procedure B is applicable to the judgment of whether
fail is caused after the impact at a stipulated temperature.
NOTE: the brittleness temperature tested in this Standard is characteristic temperature of
vulcanized rubber. It does not represent the lower limit of operating temperature
of vulcanized rubber and its products. Through brittleness temperature, the
strengths and weaknesses of low-temperature performance of different rubber
materials or different formulas of vulcanized rubber may be compared. Therefore,
in the quality inspection and production process control of rubber materials and
their products, it is of certain practical value.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specific date, only versions with the specific date are
applicable to this document. In terms of references without a specific date, the latest
versions (including all the modification orders) are applicable to this document.
GB/T 2941-2006 Rubber - General Procedures for Preparing and Conditioning Test
Pieces for Physical Test Methods (ISO 23529: 2004, IDT)
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Brittleness Point (single test piece method)
7.1.1 Test preparation: lower the lifting clamp holder; place the low-temperature
thermometer; place the thermometer’s temperature measurement point in the same
horizontal position as the lower end of the clamp. Inject heat-transfer medium into the
cryogenic container; the injection volume shall guarantee that the distance from the
lower end of the clamp to the liquid level is (75 ± 10) mm.
7.1.2 Add refrigerant (generally speaking, dry ice is adopted) to the heat-transfer
medium; slowly stir it up. Adjust it to the needed temperature, or slightly lower than the
needed temperature, so that after sample is immersed, the temperature of freezing
medium is exactly the needed temperature.
7.1.3 Raise the lifting clamp holder. Vertically clamp the sample onto the clamp holder
(see Figure 1). The clamping shall be neither excessively tight, nor excessive loose,
so as to prevent sample deformation or falling.
7.1.4 Lower the lifting clamp holder. Start to freeze the sample, meanwhile, start the
timing. The stipulated freezing time is . During sample freezing time,
temperature fluctuation of the freezing medium shall not exceed ± 1 °C.
7.1.5 Raise the lifting clamp holder; make the impactor impact the sample within 0.5 s.
7.1.6 Take down the sample; place it still for at least 30 s. Then, wipe off residual liquid
on the sample surface. In accordance with the impact direction, bend the sample into
180°. Under bright light, meticulously observe whether there is any fail; record it. When
the sample is failed, record the specific phenomena of the fail.
7.1.7 After the impact (each sample is merely allowed to be impacted once), if fail
emerges, raise the temperature of the freezing medium. Otherwise, lower the
temperature, then, continue the test.
Through repeated test, determine the lowest temperature of at least two non-failed
samples and the highest temperature of at least one failed sample. If the difference
between the two results is not more than 1 °C, end the test.
7.2 Procedure B
Conduct the test in accordance with the steps in 7.1.1 ~ 7.1.6. A group of test needs
at least 3 samples.
8 Test Result and Processing
8.1 Procedure A
8.1.1 The highest temperature when sample manifests fail is the brittleness
temperature of the sample.
(Above excerpt was released on 2019-07-12, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT1682-2014