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.
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