BS ISO 4647:2021 pdf download – Rubber, vulcanized — Determination of static adhesion to textile cord — H-pull test This document specifies a method for the determination of the static adhesion of textile cord to vulcanized rubber using the H-pull test. It is applicable to cords made from natural or man-made fibres. The property levels obtained with this method are affected considerably by the history of the cord and the rubber compound. The method yields data, however, on which a judgement as to the service quality of the material can be based. The method is primarily intended for use with tyre cord. However, it can be applied, if desired, to similar cords for use in other rubber products, but it is limited to cords of linear density not exceeding 800 mg/m (tex). 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 5893, Rubber and plastics test equipment — Tensile, flexural and compression types (constant rate of traverse) — Specification ISO 18899:2013, Rubber — Guide to the calibration of test equipment ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods 3 Terms and definitions No terms and definitions are listed in this document. 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 adhesion between a rubber and textile cord is assessed by measuring the force required to pull a single cord from a block of vulcanized rubber, the force being applied along the longitudinal axis of the cord and the length of cord embedded in the rubber being fixed (see Figure 1). Cords are stretched over and perpendicular to the rubber strips, with a distance L between each cord. Two further strips of rubber are applied above the cord, the mould closed and put into a press, and the test pieces vulcanized. It is common practice to use moulds which allow many identical test pieces to be produced simultaneously as a test pad. One example of a suitable mould is shown in Figure 2. It is recommended that the width...

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