Overview - EN ISO 283:2023 (Textile conveyor belts test method)
EN ISO 283:2023 (ISO 283:2023) is the CEN-endorsed test method for determining full thickness tensile strength, elongation at break, and elongation at the reference load of textile‑carcass conveyor belts. The standard specifies how to prepare, condition and test full‑thickness specimens taken from conveyor belts, and how to report tensile strength (N/mm) and elongation (percentage). It applies to both longitudinal testing and, where requested by the purchaser, transverse tensile strength and elongation at break. It does not apply to light conveyor belts covered by ISO 21183‑1.
Key topics and technical requirements
- Scope and intent: Measure full‑thickness tensile properties of textile conveyor belts for design, specification and quality control.
- Test principle: Extend a full‑thickness test piece in a calibrated tensile machine until rupture and record maximum force and elongation.
- Apparatus:
- Tensile testing machine (CRE/CRT type) calibrated to Grade 1 per ISO 7500‑1.
- Constant extension rate: (100 ± 10) mm/min.
- Extensometer or elongation measuring device with at least 100 mm gauge length and 0.1 mm accuracy (graphical trace preferred).
- Grips designed to prevent slippage (transverse serrations recommended).
- Die cutter or power saw for perpendicular cuts.
- Test pieces & sampling:
- Specimens cut from full belt thickness; shapes A–D defined (type D for very high tensile strengths > 2 000 N/mm).
- Sample at least 24 h after manufacture (unless noted).
- Test pieces taken ≥ 50 mm from belt edge, and no ply joints allowed.
- Cover‑reduction in grip areas and sampling location clarifications introduced in this edition.
- Measurements & results:
- Tensile strength = greatest measured force ÷ specimen width (expressed in N/mm).
- Elongation at break and elongation at reference force expressed as % increase between reference points.
- Reference force = one‑tenth of nominal tensile strength × specimen width.
- Recent changes (2023 edition): added conditioning before sampling, clarified width measurement points, required cover reduction in grips, and removed humidity requirement.
Applications - who uses EN ISO 283:2023
- Belt manufacturers - to verify product performance and declare nominal tensile strength.
- Quality control and test laboratories - for routine tensile testing and certification.
- Purchasers and specifiers - to compare supplier data and set procurement requirements.
- Design engineers and maintenance teams - to select belts for conveyors based on tensile/elongation performance.
- Standards bodies and compliance officers - for regulatory alignment and contractual testing.
Related standards
- ISO 7500‑1 - calibration and verification of tensile testing machines (force measurement).
- ISO 18573 - conveyor belts test atmospheres and conditioning periods.
- ISO 21183‑1 - light conveyor belts (excluded from EN ISO 283:2023 scope).
EN ISO 283:2023 is essential for reliable, comparable tensile testing of textile conveyor belts and supports specification, safety and lifecycle planning in bulk and unit‑handling applications.