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HG/T 4993-2016Cellular materials for shoes - Test method for resilience (English PDF)

鞋用微孔材料回弹性试验方法

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

July 11, 2016

Implementation date

January 1, 2017

Scope

HG/T 4993-2016 is the English-translated version of 鞋用微孔材料回弹性试验方法.

HG/T 4993-2016 is the Chinese standard "Cellular material for shoes. Determination of resilience". Its scope clause reads: The Standard specifies the test method for resilience of cellular material for shoes.

This Standard applies to the testing of cellular material for shoes. Its clauses include principles; test devices; test pieces; test piece conditioning and test environment; test procedures; test result; test report.

It was issued by the Ministry of Industry and Information Technology on JULY 11, 2016 and took effect on JANUARY 01, 2017.

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Document preview — HG/T 4993-2016

National Standard of the People's Republic of China

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Foreword3
1 Scope4
2 Normative references4
3 Principles4
4 Test devices4
5 Test pieces6
6 Test piece conditioning and test environment7
7 Test procedures7
8 Test result7
9 Test report8

Foreword

This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

The Standard specifies the test method for resilience of cellular material for shoes.

This Standard applies to the testing of cellular material for shoes.

2 Normative references

The following documents are indispensable for the application of this document.

For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.

GB/T 2941 Rubber - General procedures for preparing and conditioning test pieces for physical test methods

3 Principles

A pendulum of a certain mass and size falls from a fixed height to the surface of test piece. The height at which the pendulum bounces is measured. The percentage of the ratio of the bounce height of the pendulum to the falling height is calculated.

4 Test devices

4.1 Resilience testing machine

It includes the base, test piece holder (as shown in Figure 1), impact pendulum (as shown in Figure 2), resilience angle dial. The mass of the entire equipment is at least 100 times the mass of pendulum.

4.2 Test piece holder

It can hold the test piece firmly; but cannot deform the test piece (See Figure 1).

3 - Impact head;

4 - Impact hammer;

5 - Pendulum rod.

Note: The impact energy of the impact pendulum applied to the test piece is 0.2 J. The impact rate is 2 m/s.

4.4 Resilience angle dial

The dial is 1/4 of a circle, evenly divided into 90 divisions, 1° per division.

4.5 Horizontal deviation of pendulum rod

Less than 0.45 mm per 100 mm length.

4.6 Damped oscillation of pendulum

For free oscillation without the pointer, the number of times shall be no less than 300 times. For oscillation with the pointer, the number of times shall be no less than 35 times.

4.7 Resilience indication error

The resilience indication error is ±0.5 %.

4.8 Pendulum vertical suspension

The pendulum vertical suspension is 90°±10'.

5 Test pieces

5.1 The test piece shall have upper and lower parallel and flat surfaces.

5.2 The test piece size shall be at least 80 mm×80 mm. The thickness shall not be less than 50 mm.

5.3 If the thickness of test piece is less than 50 mm, it shall be superimposed to 50 mm. Adhesives can be used; but shall not be used in the center, shall be applied to the four sides of test piece to bond them. The bonding width shall be no more than 5 mm. For molded products, the upper skin shall be removed.

5.4 The number of test pieces is 3. […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 2941Rubber - General procedures for preparing and conditioning test pieces for physical test methods

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GB/T 24451-2020|HG/T 2875-2023|HG/T 6360-2025|GB/T 18944.2-2022|GB/T 42258-2022|GB/T 42266-2022

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