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GB/T 3903.4-2017 PDF in English


GB/T 3903.4-2017 (GB/T3903.4-2017, GBT 3903.4-2017, GBT3903.4-2017)
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GB/T 3903.4-2017: PDF in English (GBT 3903.4-2017)

GB/T 3903.4-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 61.060
Y 78
Replacing GB/T 3903.4-2008
Footwear -- Test methods for whole shoe -- Hardness
ISSUED ON. DECEMBER 29, 2017
IMPLEMENTED ON. JULY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword . 3 
1 Scope .. 4 
2 Normative references . 4 
3 Principle.. 4 
4 Apparatus . 4 
5 Test piece . 5 
6 Test conditions . 5 
7 Test procedures . 6 
8 Test results .. 6 
9 Test report . 7 
Footwear -- Test methods for whole shoe -- Hardness
1 Scope
This Standard specifies the test methods for hardness of footwear outsoles and
heels.
This Standard is applicable to the determination of the hardness of whole shoe
outsoles and heels.
NOTE. The sole materials (sheets) can be determined with reference to this Standard.
2 Normative references
The following documents are essential to the application of this document. For
dated references, only the editions with the dates indicated are applicable to
this document. For undated references, only the latest editions (including all the
amendments) are applicable to this document.
GB/T 531.1-2008 Rubber vulcanized or thermoplastic -- Determination of
indentation hardness -- Part 1. Durometer method (Shore hardness)
GB/T 22049 Footwear -- Standard atmospheres for conditioning and testing
of footwear and components for footwear
HG/T 2489-2007 Cellular for shoes -- Determination of hardness
3 Principle
USE a Shore durometer. PRESS the indenter of the prescribed shape into the
test piece under certain conditions. MEASURE the depth of vertical indentation.
CONVERT it to a hardness value.
The test results are influenced by the shape of the indenter and the applied
pressure. Therefore, there is no simple correspondence between the results of
tests using different types of durometers.
4 Apparatus
4.1 Durometer
7 Test procedures
7.1 CHECK the test pieces. If there are any impurities on the surface, USE
gauze moistened with alcohol to wipe them clean.
7.2 SELECT the flat surface of the sole or the main material of the heel as the
test site (if the product standard stipulates the test site, SELECT the flat part at
the specified test site). If there is no flat part, it shall be grinded. The grinding
depth shall be based on the exact removal of patterns, so that the surface of
the test piece is flat. When testing the cellular materials, the compact layer on
the surface shall be grinded to ensure that the surface of the test piece is flat,
without any mechanical damages and impurities. If the whole shoe or outsole
is equipped with the shank, the shank shall be avoided.
7.3 According to the provisions of GB/T 22049, the test piece shall be placed
at a temperature of (23 ± 2) °C in the standard environment for at least 4h.
7.4 Where necessary, the durometer can be mounted on the bracket.
7.5 PLACE the test piece on a hard surface, with the test site facing upwards.
KEEP the surface level. PRESS the indenter foot onto the test piece at a
uniform speed with no vibration as far as possible. KEEP the indenter foot
parallel to the surface of the test piece. The indenter is perpendicular to the
surface of the test piece and is not less than 12mm from the edge of the test
specimen. APPLY enough pressure. After the indenter foot is in complete
contact with the test specimen for 3s, READ the value.
7.6 For each test piece, measurements shall be taken at 3 or more points.
Hardness can only be measured once at each measuring point. The distance
between the points is not less than 6mm.
8 Test results
8.1 RECORD the types of the durometers in use. The value indicated by the
durometer pointer is the measured value. The unit is expressed in degrees.
8.2 TEST the two shoes (soles) in each set of test pieces, respectively.
MEASURE each shoe (sole) at 3 points. At the time of an arbitration test,
MEASURE at 5 points. TAKE the arithmetic mean as the test result of the shoe
(sole). The absolute value of the relative deviation between each measured
value and the mean value shall not exceed 5%. If exceeding the deviation, the
values exceeding the deviation shall be discarded, and additional
measurements shall be made. The test results shall be rounded. At the time of
a dispute or an arbitration test, the results measured using the bracket shall
prevail.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.