ISO 1141:2021 PDF

Overview

ISO 1141:2021 defines requirements and designation rules for polyester fibre ropes in standard constructions: 3‑strand hawser‑laid, 4‑strand shroud‑laid, 8‑strand braided and 12‑strand braided. The fifth edition (2021) specifies physical properties (linear density in ktex and minimum breaking strength - MBS), marking, and general manufacturing and delivery conventions for polyester ropes intended for general service. It also clarifies that not all variations in strength or performance are covered and that the rope manufacturer must be consulted to ensure suitability for a given application.

Key topics and requirements

• Covered constructions: Type A (3‑strand), Type B (4‑strand), Type L (8‑strand) and Type T (12‑strand).
• Designation rules: Ropes are designated with “fibre rope”, the standard number (ISO 1141), construction/type, reference number, material (PES) and stabilization type (1 = heat‑set, 2 = not heat‑set).
• Physical properties: Linear density (ktex) and minimum breaking strength (MBS) are specified in tables for each reference number; linear density is measured under reference tension per ISO 2307.
• MBS details: Tables give MBS for new dry and wet ropes; values differ for unspliced ropes and ropes with eye‑spliced terminations.
• Tolerances & measurement: Tolerances on linear density are provided (modified in this edition). Measurement and test methods reference ISO 2307 and ISO 9554.
• Marking: Type 1 ropes (reference number