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GB/T 7985-2025Conveyor belts - Method for the determination of the tear propagation resistance of textile conveyor belts (English PDF)

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Issued by

State Administration for Market Regulation

Level / Type

National · Recommended

Issue date

August 29, 2025

Implementation date

March 1, 2026

Scope

GB/T 7985-2025 (Conveyor belts - Method for the determination of the tear propagation resistance of textile conveyor belts) is available as an English-translated PDF.

GB/T 7985-2025 — This document describes a method for the determination of the tear propagation resistance of full-thickness textile conveyor belts or cores with the cover removed.

This document applies to textile conveyor belts without transverse metal mesh used in facilities where there is a risk of longitudinal tearing.

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Document preview — GB/T 7985-2025

National Standard of the People's Republic of China

ICS: 53.040.20

Issued by: State Administration for Market Regulation

Foreword...3
1 Scope...4
2 Normative references...4
3 Terms and definitions...4
4 Principle...4
5 Apparatus...4
6 Test sample...5
6.1 Sampling method...5
6.2 Shape and dimensions...5
6.3 Quantity...5
6.4 Preparation...5
7 Test method...7
7.1 Conditioning of test samples...7
7.2 Test conditions...8
7.3 Procedure...8
7.4 Expression of results...9
7.5 Test report...9
Bibliography...10

Foreword

This document was drafted in accordance with the rules given in GB/T 1.1-2020,

Directives for standardization - Part 1.Rules for the structure and drafting of

standardizing documents.

This document replaces GB/T 7985-2005 Conveyor belts - Method for the

determination of the tear propagation resistance of textile conveyor belts. Compared

with GB/T 7985-2005, except for structural adjustment and editorial changes, the main

technical changes are as follows.

a) Add terms and definitions (see Chapter 3);

b) Modify the sample preparation (see 6.4; 5.4 of the 2005 edition);

c) Modify the conditioning of test samples (see 7.1; 6.1 of the 2005 edition).

This document is identical to ISO 505.2025, Conveyor belts - Method for the

determination of the tear propagation resistance of textile conveyor belts.

1 Scope

This document describes a method for the determination of the tear propagation

resistance of full-thickness textile conveyor belts or cores with the cover removed.

This document applies to textile conveyor belts without transverse metal mesh used in

facilities where there is a risk of longitudinal tearing.

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.

ISO 6133, Rubber and plastics - Analysis of multi-peak traces obtained in

determinations of tear strength and adhesion strength

Note. GB/T 12833-2006, Rubber and plastics - Analysis of multipeak traces obtained

in determinations of tear strength and adhesion strength (ISO 6133.1998, IDT)

ISO 18573, Conveyor belts - Test atmospheres and conditioning periods

Note. GB/T 30691-2014, Conveyor belts - Test atmospheres and conditioning

periods (ISO 18573.2012, IDT)

3 Terms and definitions

No terms and definitions need to be defined in this document.

4 Principle

Stretch the test sample at a specified speed to test the force required for the initial crack

in the test sample to propagate.

5 Apparatus

The tensile testing machine shall have the following basic characteristics.

a) The measuring range of the testing machine shall be such that the measured

force value is within 90% of its range;

b) The separation speed of the two grippers shall be adjustable to (50±10)

mm/min;

c) The distance between the two grippers holding the test sample shall be

adjustable to at least 300 mm.

The tensile testing machine shall be equipped with a recording device for automatically

plotting tear force curves.

6 Test sample

6.1 Sampling method

The test sample shall be cut along the longitudinal direction of the belt, at a distance of

not less than 50 mm from the edge of the belt.

6.2 Shape and dimensions

Shape. rectangular.

Length. 300 mm.

Width. (100 ± 1) mm.

Thickness. the thickness of the full-thickness belt or the core with the cover removed.

If, during the test, the weft thread of the test sample is pulled out instead of being broken,

the test sample width shall be increased to 300 mm.

Note. Depending on the test conditions, the sample length and cut length may be

appropriately increased.

6.3 Quantity

Two samples shall be used, one for grip method A and the other for grip method B (see

Figure 4).

6.4 Preparation

If the test is required to be carried out without a cover, the cover of the test sample shall

be removed by peeling or grinding.

If a buffer layer is present, peel off only the cover outside the gripping area within a

width of 20 mm in the middle of the test sample (10 mm on each side of the longitudinal

axis), without damaging the buffer layer (see Figure 1).

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 10 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 30691-2014Conveyor belts -- Test atmospheres and conditioning periods

ISO 6133 · GB/T 12833-2006 · ISO 6133.1998 · ISO 18573 · ISO 18573.2012

Cited by

HG/T 2805-2012Solid woven flame-retardant conveyor belts for underground coal mines

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