GB/T 45711.2-2025 PDF English
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| GB/T 45711.2-2025 | English | 215 |
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Leather - Determination of tear load - Part 2: Double edge tear
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GB/T 45711.2-2025: Leather - Determination of tear load - Part 2: Double edge tear---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/GBT45711.2-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.140.30
CCS Y 46
Leather - Determination of Tear Load - Part 2.Double Edge
Tear
(ISO 3377-2.2016, Leather - Physical and mechanical tests - Determination of tear
load - Part 2.Double edge tear, MOD)
Issued on: MAY 30, 2025
Implemented on: DECEMBER 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 4
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 5
4 Principle... 5
5 Instruments and Equipment... 5
6 Sampling and Specimen Preparation... 7
7 Test Procedures... 7
8 Result Presentation... 8
9 Test Report... 8
Appendix A (informative) Comparison of Structural No. between This Document and
ISO 3377-2.2016... 10
Appendix B (informative) Technical Differences between This Document and ISO
3377-2.2016 and the Causes... 11
Leather - Determination of Tear Load - Part 2.Double Edge
Tear
1 Scope
This document describes a test method for determining the tear load of leather using the double
edge tear (i.e., Baumann tear) method.
This document is applicable to the determination of the tear load of various types of leather.
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 39364 Leather - Chemical, Physical, Mechanical and Fastness Tests - Sampling Location
(GB/T 39364-2020, ISO 2418.2017, MOD)
GB/T 45705 Leather - Physical and Mechanical Tests - Determination of Thickness (GB/T
45705-2025, ISO 2589.2016, MOD)
QB/T 2707 Leather - Physical and Mechanical Tests - Sample Preparation and Conditioning
3 Terms and Definitions
This document does not have terms or definitions that need to be defined.
4 Principle
Place a rectangular specimen of specified shape (with a hole in the middle) on the test hooks of
the upper and lower fixtures of the tensile testing machine, operate the tensile testing machine,
and record the maximum force value during the tearing process of the specimen, which is the
tear load of the specimen.
5 Instruments and Equipment
5.1 Tensile testing machine, which complies with the following conditions.
---Tensile test range is compatible with the specimen;
6 Sampling and Specimen Preparation
6.1 Sampling
Perform in accordance with the provisions of GB/T 39364.If sampling from a standard location
is not possible (e.g., directly from shoes or clothing), specimens shall be taken from any location
within the available area; the specimens shall be representative, and this shall be noted in the
test report.
6.2 Specimen Preparation
Use a die cutter (5.4) to cut six specimens from the grain surface (if the grain surface cannot be
identified, cut from the usable surface). Three of these specimens shall have their long sides
parallel to the ridgeline, and the other three specimens shall have their long sides perpendicular
to the ridgeline. If the ridgeline direction cannot be identified, respectively take specimens from
two mutually perpendicular directions.
If more than two samples from the same batch need to be tested, at least one specimen shall be
cut from each sample in each direction, with a total of no less than three specimens in each
direction.
6.3 Specimen Conditioning
Perform in accordance with the provisions of QB/T 2707.
6.4 Thickness Determination
Perform in accordance with the provisions of GB/T 45705.The measurement location is the
midpoint of the perpendicular distance between A and B and their respective side lines (short
sides).
7 Test Procedures
7.1 Adjust the tensile testing machine, so that the hook parts of the two test hooks are close to
each other. Insert the hole of the specimen into the hook parts of the two test hooks, with the
wide sides of the test hooks parallel to the straight sides of the specimen hole, to ensure that the
specimen is supported on the support and does not fall off.
7.2 Operate the tensile testing machine, until the specimen tears. Record the maximum force
during the test.
7.3 Repeat steps 7.1 ~ 7.2 to test the remaining specimens.
8 Result Presentation
8.1 Tear Load
The result is the arithmetic mean of the test results for each specimen in each direction, accurate
to 0.1 N.
If necessary (e.g., upon requested by the customer), the result may be the arithmetic mean of
the test results for all specimens.
8.2 Tear Strength
The tear strength of the specimen is calculated in accordance with Formula (1).
Where,
T---the tear strength, expressed in (N/mm);
F---the tear load, expressed in (N);
t---the thickness of the torn side of the specimen (if both sides are torn at the same time, take
the average thickness of the two points), expressed in (mm).
The result is the arithmetic mean of the test results for each specimen in each direction, accurate
to 0.1 N/mm.
If necessary (e.g., upon request by the customer), the result may be the arithmetic mean of the
test results for all specimens.
9 Test Report
The test report shall include the following contents.
a) Serial No. of this document (i.e., GB/T 45711.2);
b) Detailed information about the sample and any inconsistency with GB/T 39364 in
sampling;
c) If necessary, the thickness of the specimen (the thickness of the torn side);
d) Test results;
e) Specimen conditioning and the standard atmosphere used for testing (QB/T 2707);
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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