Codeofchina.com is in charge of this English translation. In case of any doubt about the contents of English translation, the Chinese original shall be considered authoritative.
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 3903.4-2008 Footwear—Test Methods for Whole Shoe—Hardness. The following technical deviations have been made with respect to the GB/T 3903.4-2008:
——The standard name is modified;
——The application scope is modified;
——The test equipment is modified;
——The sampling method is modified;
——The test procedures are modified;
——The description of test report is modified.
Attention is drawn to the possibility that some of the elements of this standard may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This standard was proposed by China National Light Industry Council.
This standard is under the jurisdiction of the National Technical Committee 305 on Shoemaking of Standardization Administration of China (SAC/TC 305).
The previous editions of the standard replaced by this standard are as follows:
——GB/T 3903.4-1994, GB/T 3903.4-2008.
Footwear—Test Methods for Whole Shoe—Hardness
1 Scope
This standard specifies the test methods for the hardness of outsole and heel.
This standard is applicable to testing for hardness of outsole and heel.
Note: reference may be made to this standard for testing the sole materials (pieces).
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 531.1-2008 Rubber Vulcanized or Thermoplastic—Determination of Indentation Hardness—Part 1: Duromerer 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 the Shore durometer to measure the vertical depth that a specially shaped indenter is pressed into the specimen and convert it to hardness value.
As the measuring results are affected by the difference of indenter shapes and applied forces, there is no simple correspondence among the results obtained from different types of durometers.
4 Apparatus
4.1 Durometer
4.1.1 Types A and D Shore durometers shall meet the requirements of GB/T 531.1-2008. Type A Shore durometer is applicable to rubber or soft plastic material; Type D Shore durometer is applicable to hard plastic material.
4.1.2 Type C Shore durometer shall meet the requirements of HG/T 2489-2007 and be applicable to micro-porous or foam materials.
4.1.3 Type D durometer shall be used when the measured value of Type A durometer exceeds 90° and Type A durometer shall be used when the measured value of Type D durometer is lower than 20°. It is inaccurate if the indicating value of Type A durometer is lower than 10° and such value shall not be adopted.
4.1.4 Types A, C and D Shore durometers are either hand-held or installed on the support (4.2) for use.
4.2 Support
4.2.1 The support can fix the durometer and make the indenter foot parallel to the bearing surface of specimen; apply force on the weight at the central axis of indenter through the support, so that the indenter foot presses on the specimen.
4.2.2 The height of durometer on the support is adjustable; shoe last and fixing device are fixed on the support base to prevent the specimen from shaking in testing process.
4.2.3 The support can press down under vibration-free and uniform-speed conditions.
4.2.4 The total mass of the weight applied with test force of spring and the durometer shall reach 1+0.1 0kg (applicable to Types A and C Shore durometers) or 5+0.5 0kg (applicable to Type D Shore durometer).
5 Specimens
A group of specimens shall have at least one pair of whole shoes or soles (heels); the test on vulcanized footwear shall be carried out after at least 16h of vulcanization.
6 Test Conditions
6.1 The last shall be placed when testing the whole shoes and when testing the formed sole. At the test position, there shall be no gap between the last and whole shoe or formed sole.
6.2 According to the requirements of GB/T 22049, the test shall be conducted under the standard environmental temperature (23±2)℃.
7 Test Procedures
7.1 Inspect the specimen and use the ethanol-soaked gauze to wipe up the impurities detected on surface.
7.2 For the purpose of testing, select the flat and smooth area on the surface of the main material of sole or heel (or on the test part if the test part is specified in the product standard). If no such flat and smooth area exists, the specimen surface shall be polished to a depth just removing the pattern. When testing the micro-porous material, the dense layer on surface shall be polished away, and the specimen surface shall be flat and smooth, as well as free from mechanical damage or impurities. If the whole shoe or formed sole is assembled with shank, the shank shall be avoided.
Foreword i
1 Scope
2 Normative References
3 Principle
4 Apparatus
5 Specimens
6 Test Conditions
7 Test Procedures
8 Test Results
9 Test Report
