GB/T 3903.29-2022 English PDF (GBT3903.29-2022)

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GB/T 3903.29-2022: Footwear -- Test methods for outsoles -- Determination of split tear strength and delamination resistance
GB/T 3903.29-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 61.060
CCS Y 78
Replace GB/T 3903.29-2008
Footwear - Test methods for outsoles - Determination of split
tear strength and delamination resistance
(ISO 20875:2018, MOD)
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: MAY 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Test equipment and materials ... 6
5 Sampling and environmental conditioning ... 6
6 Test method ... 7
7 Test results ... 8
8 Test report ... 8
Foreword
This document is drafted in accordance with the provisions of GB/T 1.1-2020
“Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents”.
This document replaces GB/T 3903.29-2008 “Footwear - Test methods for outsoles -
Split tear strength and delamination resistance”. Compared with GB/T 3903.29-2008,
except for structural adjustments and editorial changes, the main technical changes are
as follows:
a) The terms and definitions of “split tear strength” is changed (see 3.2; see 3.2 of
the 2008 edition);
b) The requirements for the moving speed of the clamp and the length of the split
cut are changed (see Chapter 6; see Chapter 6 of the 2008 edition);
c) The rounding-off requirements for the values of the delamination resistance test
results are added (see 7.1);
d) The calculation formula for the split tear strength test results is added (see 7.2);
e) The labeling requirements for “standard environmental conditions during the test”
in the test report are added (see Chapter 8).
This document is modified in relation to ISO 20875:2018 “Footwear - Test methods for
outsoles - Determination of split tear strength and delamination resistance”.
The technical differences between this document and ISO 20875:2018 and their reasons
are as follows:
--- The scope of application of the standard is added (see Chapter 1) to meet the
requirements for compiling standards in China;
--- The definition of split tear strength is changed (see 3.2) to clarify that it is a
strength index and consistent with the calculation formula;
--- The normatively referenced GB/T 16825.1 replaces ISO 7500-1 (see 4.1), GB/T
22049 replaces ISO 18454 (see Chapter 5), and GB/T 22050 replaces ISO 17709
(see Chapter 5); these are to adapt to the Chinese technical conditions and help to
the improvement of operability;
--- Changed the accuracy of the tensile-testing machine is changed to level 2 (see
4.1), so as to be consistent with the level requirements for the tensile-testing
machine in the cited document;
Footwear - Test methods for outsoles - Determination of split
tear strength and delamination resistance
1 Scope
This document describes a method for the determination of the split tear strength and
delamination resistance of outsoles.
This document applies to all kinds of outsoles for footwear.
2 Normative references
The following documents contain the provisions which, through normative reference in
this document, constitute the essential provisions of this document. For the dated
referenced documents, only the versions with the indicated dates are applicable to this
document; for the undated referenced documents, only the latest version (including all
the amendments) is applicable to this document.
GB/T 16825.1 Verification of static uniaxial testing machines - Part 1:
Tension/compression testing machines - Verification and calibration of the force-
measuring system (GB/T 16825.1-2008, ISO 7500-1:2004, IDT)
GB/T 22049 Footwear - Standard atmospheres for conditioning and testing of
footwear and components for footwear (GB/T 22049-2019, ISO 18454:2018, IDT)
GB/T 22050 Footwear - Sampling location, preparation and duration of conditioning
of samples and test pieces (GB/T 22050-2008, ISO 17709:2004, IDT)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 delamination resistance
If the outsole consists of multiple adhesive layers, the resistance is equal to the force
required to separate the adhesive layer or bonded interface divided by the width of the
sample.
3.2 split tear strength
1 --- Average value (the average value of all force values after the initial peak
value of the force reaches).
Figure 2 -- Graphical example of force/displacement
7 Test results
7.1 Calculate the delamination resistance Ds according to formula (1).
where:
Ds --- Delamination resistance, in Newton per millimeter (N/mm);
F --- Average force value, the unit is Newton (N);
d --- The width of the sample, in millimeters (mm).
The test result shall be the average value of 3 values, rounded to one decimal place.
7.2 Calculate the split tear strength STs according to formula (2).
where:
STs ---Split tear strength, in Newton per millimeter (N/mm);
F --- Average force value, the unit is Newton (N);
d --- The width of the sample, in millimeters (mm).
The test result shall be the median of 3 values, rounded to one decimal place.
8 Test report
The test report shall include the following contents:
a) Test results, expressed in accordance with Chapter 7;
b) Detailed description of the test sample, including style code, color, material, etc.;