ISO 283:2023

Overview

ISO 283:2023 - "Textile conveyor belts - Full thickness tensile strength, elongation at break and elongation at the reference load - Test method" specifies a laboratory procedure to determine the full-thickness tensile strength, elongation at break, and elongation at the reference force of conveyor belts with a textile carcass. The method covers longitudinal testing and, when requested, transverse tensile strength and elongation at break. It excludes light conveyor belts (see ISO 21183‑1).

Key topics and technical requirements

• Test principle: Extend a full-thickness belt specimen in a calibrated tensile testing machine until rupture and record maximum force and elongation.
• Apparatus:
  • Tensile testing machine (CRE or CRT type), calibrated to Grade 1 per ISO 7500‑1, speed (100 ± 10) mm/min.
  • Extensometer (measuring length ≥100 mm, accuracy ≤0.1 mm) preferred for continuous trace.
  • Non‑slip grips (transverse serrations recommended) and suitable cutters/dies for perpendicular side faces.
• Specimens:
  • Types A–D shapes (dimensions specified in the standard); reference lines 100 mm apart.
  • Sample at least 24 hours after manufacture; cut specimens at ≥50 mm from belt edge; avoid ply joints.
  • Measure width at the centre between reference lines; reduce covers only in grip areas if needed.
  • Minimum of three longitudinal specimens (and three transverse if required).
• Conditioning: Follow ISO 18573 using atmosphere D or E, and test immediately after conditioning.
• Procedure and calculations:
  • Initial grip distances vary by specimen type (e.g., Type A: 220 ± 10 mm; B & D: 415 ± 10 mm; C: 240 ± 10 mm).
  • Reference force = one‑tenth of the nominal tensile strength × specimen width.
  • Tensile strength (N/mm) = maximum force / specimen width; report arithmetic mean of three specimens.
  • Elongation (%) at break and at reference force computed from gauge length change; report mean to one decimal place.
• Reporting: Include test method reference (ISO 283:2023), belt ID, specimen type, conditioning details, temperature/humidity, whether covers were present, and mean results.

Applications and users

ISO 283:2023 is used for:

• Manufacturers - product development, quality control and declaration of tensile properties.
• Third‑party test laboratories - standardized acceptance and certification testing.
• Purchasers / specifiers - contract verification and supplier acceptance testing.
• Design and R&D teams - material selection and comparative performance assessments. Practical uses include contract compliance, comparative performance benchmarking, failure analysis, and ensuring safe conveyor design.

Related standards

• ISO 7500‑1 - calibration of tensile testing machines
• ISO 18573 - conveyor belt test atmospheres and conditioning periods
• ISO 21183‑1 - light conveyor belts (exclusion)
• Developed by ISO/TC 41 in cooperation with CEN/TC 188

Keywords: ISO 283:2023, textile conveyor belts, tensile strength test, elongation at break, reference force, conveyor belt testing, full thickness tensile strength.