ISO 23475-2:2025
(Main)Testing method for steel tyre cord — Part 2: Adhesion test
Testing method for steel tyre cord — Part 2: Adhesion test
This document specifies adhesion test methods of steel cords which are used for tyre reinforcement.
Méthode d'essai pour les câbles de pneumatiques en acier — Partie 2: Essai d'adhérence
General Information
Standards Content (Sample)
International
Standard
ISO 23475-2
First edition
Testing method for steel tyre cord —
2025-10
Part 2:
Adhesion test
Méthode d'essai pour les câbles de pneumatiques en acier —
Partie 2: Essai d'adhérence
Reference number
© ISO 2025
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ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus and equipment . 1
6 Rubber compound . 2
7 Procedure . 2
7.1 Preparation for vulcanization machine and mould .2
7.2 Preparation for rubber compound .2
7.3 Preparation for vulcanization mould .3
7.4 Preparation for samples .3
7.5 Preparation for rubber block .3
7.6 Vulcanization .5
7.7 Measurement .6
8 Report . 7
Annex A (informative) Vulcanization mould and top plate . 8
Annex B (informative) Block holder . 10
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 17, Steel wire rod
and wire products.
A list of all parts in the ISO 23475 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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iv
International Standard ISO 23475-2:2025(en)
Testing method for steel tyre cord —
Part 2:
Adhesion test
1 Scope
This document specifies adhesion test methods of steel cords which are used for tyre reinforcement.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements 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 17832, Non-parallel steel wire and cords for tyre reinforcement
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 17832 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Principle
The steel cords are vulcanized into a block of rubber compound and the force necessary to pull the cords
linearly out of the rubber block is measured. The used clamp or block holder shall be equipped with a circle
hole to guarantee the homogenous stress.
5 Apparatus and equipment
5.1 Lab rubber mixing mill
Diameter of roller: About 160 mm.
Width of operation: Minimum 220 mm.
Equipped with heating/cooling system.
5.2 Thickness gauge
Resolution: 0,1 mm.
Measuring range: 0 mm to 20 mm.
5.3 Vulcanization press
Temperature resolution: 0,5 °C.
Temperature capacity: Maximum 200 °C.
Temperature distribution: The plate temperature shall be maintained within the tolerance of ±1 °C,
difference between setting temperature and actual temperature shall be within ±1 °C.
Dimension of the plate: Minimum 400 mm × 400 mm.
Vulcanization pressure: Minimum pressure of 3,5 MPa over total area of the cavity of the mould.
5.4 Tensile test machine
5.5 Pre-builder mould (it is recommended)
The use of pre-builder mould can reduce the time for assemble rubber block.
The pre-builder mould can be adjusted according to the dimension of the vulcanization mould.
5.6 Vulcanization mould (refer to Annex A), block holder (refer to Annex B).
5.7 Timer, safety gloves, heat protection gloves, diagonal pliers, balance, fusing machine,
polythene film.
6 Rubber compound
6.1 The rubber compound is given by customer, together with the in
...
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