GB/T 3903.12-2021

Footwear—Test methods for outsoles—Tear strength (English Version)

Standard No.

GB/T 3903.12-2021

Language

Chinese, Available in English version

Release Date

2021

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 3903.12-2021

Replace

GB/T 3903.12-2005

Scope

This document describes a test method for the determination of the tear strength of footwear outsoles using trouser-shaped specimens. This document applies to footwear outsoles of all materials.

Introduction

Core changes in the standard revision

Key dimensions	GB/T3903.12-2005	GB/T3903.12-2021
Scope of application	No special instructions are specified	Added the statement of applicability of outsoles of all materials
Definition of terms	Simple definition of median	Improve the median calculation rules for odd/even samples
Equipment requirements	Citing ISO75001	Replacing GB/T16825.1 (equivalent to ISO75001)

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Technical Points Analysis

1. Specimen Preparation Specifications

The standard clearly defines three types of specimens: S2 (double original skin), S1 (single original skin), S0 (no original skin). For polymer outsole, the recommended thickness is 2.0mm±0.2mm, and for foam material, the recommended thickness is 4.0mm±0.2mm.

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2. Key parameters of test equipment

• Pressure requirement of tensile testing machineLevel 2
• Clamp moving speed100mm/min±10mm/min
• Thickness gauge pressure10kPa±3kPa

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3. Data processing method

Different algorithms are used according to the number of peaks:
Method A (<5 peaks): take the median of all peaks
Method B (5-20 peaks): take the median of the peaks in the middle 80% range

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Implementation suggestions

1. Laboratory preparation

It is necessary to be equipped with a tensile testing machine and special trouser-shaped specimen mold, the mold size tolerance should be controlled within ±0.1mm.

2. Common Problems

When the specimen length is insufficient, it is recommended to clearly stipulate the test plan in the purchase contract and indicate the actual specimen size in the report.

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Analysis of Differences in International Standards

Compared with ISO20872:2018, my country's standard adds:
1) Specimen type identification requirements (S0/S1/S2)
2) Negotiation mechanism for special size specimens
3) Environmental adjustment cites GB/T22049 instead of ISO18454

GB/T 3903.12-2021 Referenced Document

• GB/T 16825.1 Metallic materials—Calibration and verification of static uniaxial testing machines—Part1:Tension/compression testing machines—Calibration and verification of the force-measuring system*， 2022-10-14 Update
• GB/T 22049 Footwear—Standard atmospheres for conditioning and testing of footwear and components for footwear
• GB/T 22050 Footwear.Sampling location,preparation and duration of conditioning of samples and test pieces
• ISO 17709:2004 Footwear - Sampling location, preparation and duration of conditioning of samples and test pieces
• ISO 18454:2018 Footwear - Standard atmospheres for conditioning and testing of footwear and components for footwear

GB/T 3903.12-2021 history

• 2021 GB/T 3903.12-2021 Footwear—Test methods for outsoles—Tear strength
• 2005 GB/T 3903.12-2005 Footwear-Test methods for outsoles-Tear streagh

GB/T 3903.12-2021 -All Parts