ISO/DIS 10325:2025(en)

ISO TC 38

Secretariat: JISC

Date: 2025-06-11

Fibre ropes — High modulus polyethylene - 8 strand braided ropes, 12 strand braided ropes and covered ropes

Cordages en fibres — Polyéthylène à haut module — Cordages 8 torons, cordages 12 torons et cordages avec couverture

© ISO 2025

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Contents Page

Foreword ii

1 Scope 1

2 Normative references 1

3 Terms and definitions 1

4 Designation fibre ropes 2

5 Material 2

6 General requirements 3

7 Physical properties 4

8 Marking 7

Foreword

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This document was prepared by Technical Committee ISO/TC 38, Textiles.

This third edition cancels and replaces the second edition (ISO 10325: 2018), which has been technically revised.

The main changes compared to the previous edition are as follows:

— Clause 2: use undated references instead of dated references;

— Clause 4: revise the description of designation;

— Clause 5: revise the description of material;

— Clause 6: revise figure 1 and adjust the layout of the figures;

— Clause 7: revise the description of physical properties;

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Fibre ropes — High modulus polyethylene — 8-strand braided ropes, 12-strand braided ropes and covered ropes

This document specifies requirements for 8-strand braided ropes, for 12-strand braided ropes, and for covered rope constructions (single braid, double braid and multi-core construction) for general purpose made of high modulus polyethylene (HMPE), and gives rules for their designation.

Many different types and grades of HMPE fibre exist which are commonly used to produce rope products. This document does not cover all variations in strength or product performance. The rope manufacturer and rope user shall align to ensure the rope design is fit for the intended purpose.

NOTE Safety of a rope is determined by the manufacturer as well as the user. A rope is fit for the intended purpose if the manufacturer properly engineers, manufacturers, tested and integrates the rope. Only when the user applies, operates, inspects the rope and have it properly maintained a rope fit for the intended purpose is fit for the intended service.

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 1968, Fibre ropes and cordage — Vocabulary

ISO 2307, Fibre ropes — Determination of certain physical and mechanical properties

ISO 9554, Fibre ropes — General specifications

For the purposes of this document, the terms and definitions given in ISO 1968 and the following apply.

ISO and IEC maintain terminological 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/

3.1

cover, jacket

braided cover or other protective layer, which is placed over the rope core

Note 1 to entry: The cover has no significant contribution to the rope strength.

3.2

heat-set rope

rope with properties that have been modified by applying heat simultaneously with the addition of a controlled strained force

Fibre ropes shall be designated by the following:

— the words “fibre rope”;

— the number of this document, i.e. ISO 10325;

— the construction or type of the rope (see Clause 6);

— the reference number of the rope;

— the material from which the rope is made;

— the type of stabilization (type 1 or type 2 in accordance with ISO 9554).

HMPE ropes that have been heat set are designated as type 1 ropes. HMPE ropes that have not been heat set are designated as type 2 ropes.

EXAMPLE Designation of a 12-strand braided rope, reference number 20 (type T), corresponding to a linear density of 232 ktex made of high modulus polyethylene (HMPE) that has not been heat set:

               Fibre rope ISO 10325 - T - 20 - HMPE - 2

5.1 The ropes, or load bearing core of the rope, shall be made of continuous filament HMPE fibres.

5.2 Overlay finishes and coatings are applied on the yarn, strand or rope making ropes fit for the intended use.

5.3 Concerning covered ropes, the cover may consist of a variety of fibre materials, for example, polyester (PET PES), polyolefins polypropylene (PP), high modulus polyethylene (HMPE), and may be of varying thicknesses, depending on the requirements of the application. The type and level of protection depends on cover construction (e.g. type of fiber(s), thickness, and applied coatings). Core constructions may vary significantly also and include such designs as a single core or multiple cores. Consult the rope manufacturer to ensure the intended cover design is fit for the intended application.

5.4 The typical characteristics of high modulus polyethylene fibre are indicated in ISO 9554, Table A.1.

5.5 Heat setting may be done on HMPE ropes in order to increase the break strength per unit weight. A rope that has been heat set will have higher break strength for the same diameter as a non-heat-set rope, however the overall life time of the rope may be decreased. Consult the rope manufacturer to ensure the intended design meets the requirements of the application. Properties of heat-set ropes are not included in this document.

NOTE 1 Ropes constructed from 100 % HMPE fibres float. However, covered HMPE ropes can have a higher specific gravity and might sink.

NOTE 2 HMPE fibres have a low coefficient of friction and good abrasion resistance. The coefficient of friction can be altered by applying suitable coatings.

Different HMPE fibre grades may have different creep properties. If requested, the manufacturer shall provide information about creep properties.

HMPE fibre ropes shall be made in one of the following constructions:

— type L: 8-strand braided ropes (see Figure 1);

— type T: 12-strand braided ropes (see Figure 2);

— type K: covered ropes [see Figures 3 a) and 3 b)].

Figure 1 — Shape of an 8-strand braided rope (type L)

Figure 2 — Shape of a 12-strand braided rope (type T)

a) Single rope core

b) Multiple cores: 3-strand cores

Figure 3 — Shape of a covered rope (type K)

6.2.1 The construction, manufacture and braid pitch of 8-strand ropes and 12-strand ropes shall conform to ISO 9554.

6.2.2 In the construction of covered ropes, the rope core is protected by a non-load-bearing cover. The construction, manufacture and lay length or braid pitch of the rope core or sub-ropes shall conform to ISO 9554.

NOTE The core or the sub-ropes can have various constructions.

6.2.3 In the protective cover, strand interchanges, i.e. the overlapping continuation of an interrupted strand with another identical strand following the same path, are permitted if they are properly staggered.

Labelling, packaging, invoicing and delivered lengths shall conform to ISO 9554.

For covered ropes, the diameter and linear density of the rope varies based on the cover material and thickness of the cover design selected. The values in Table 2 reflect the strength of the load bearing core only. Consult the rope manufacturer for the actual diameter, linear density and strength values for specific cover design.

The linear density and minimum breaking strength shall conform to Tables 1 and 2, which are indicative for general purpose ropes only. Various types of HMPE fibre are available with alternate performance characteristics and are outside of the scope of this document.

The supplier shall provide the user with a set of instructions for the use and maintenance of the fibre ropes. The user shall consider the performance requirements for the intended application before selecting a rope design and size.

Table 1 — Linear density and minimum breaking strength of 8-strand (type L) and 12-strand (type T) HMPE braided ropes

Table 2 — Linear density and minimum breaking strength of covered HMPE ropes (type K)

The manufacturer may use coloured synthetic yarn(s) to identify its rope.

A printed marker tape shall be used in accordance with ISO 9554.