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GB/T 45711.2-2025Leather - Determination of tear load - Part 2: Double edge tear (English PDF)

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Issued by

State Administration for Market Regulation

Level / Type

National · Recommended

Issue date

May 30, 2025

Implementation date

December 1, 2025

Scope

GB/T 45711.2-2025 (Leather - Determination of tear load - Part 2: Double edge tear) is available as an English-translated PDF.

GB/T 45711.2-2025 is the Chinese standard "Leather - Determination of tear load - Part 2: Double edge tear". Its scope clause reads: 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. Its clauses include terms and definitions; principle; instruments and equipment; sampling and specimen preparation; test procedures; result presentation; test report.

It was issued by the State Administration for Market Regulation on 2025-05-30 and took effect on 2025-12-01.

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Document preview — GB/T 45711.2-2025

National Standard of the People's Republic of China

ICS: 59.140.30

Issued by: State Administration for Market Regulation

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

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);

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 8 pages — is available in the English PDF.

Referenced standards

Normative references

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