Overview
ISO 1120:2025 - Conveyor belts - Determination of strength of mechanical fastenings for textile conveyor belts - Static test method - specifies a laboratory static tensile test to measure the strength of mechanical fastenings on textile conveyor belts. It covers fastenings that use a connecting rod and those that do not, excludes vulcanized joints and is not applicable to light conveyor belts (see ISO 21183‑1). The standard’s primary purpose is to screen out mechanical fastenings with insufficient static strength; a dynamic test is intended to follow in a later document.
Key topics and requirements
- Test principle: Apply an increasing tensile force until rupture at the mechanical joint.
- Apparatus: Metallic adapter plate (for removable connecting rods) and a tensile testing machine as described in ISO 283.
- Specimen preparation:
- Specimen width: 150 mm.
- Minimum specimen length: 100 mm plus gripped length.
- For non‑rod fastenings use two belt pieces assembled by the fastening.
- Fastening width = pitch × number of fastener plates.
- Minimum fastener counts: ≥10 staples/screws for staple/screw types without a metal plate; ≥3 plates for plate types with screws.
- Conditioning and environment: Tests start not less than 24 h after manufacture (includes 8 h conditioning at a specified temperature from ISO 18573). In disputes, conditioning is 72 h. Record conditioning/testing temperature.
- Test procedure: Separate grips at a rate of (100 ± 10) mm/min, ensuring symmetric loading; record maximum force at failure.
- Results expression: Report arithmetic mean breaking strength in N/mm of fastening width and as a percentage of full‑thickness nominal tensile strength (per ISO 283).
- Sample count: Three test pieces per test series.
- Test report requirements: Include fastening width, method (with/without connecting rod), fastener and belt brand/type, mean values, failure mode, conditioning temperature and test date.
Applications and users
ISO 1120:2025 is practical for:
- Conveyor belt manufacturers and fastener suppliers validating joint designs.
- Independent testing laboratories performing QA and acceptance tests.
- Engineering and maintenance teams specifying acceptable fastening strength for bulk material handling systems.
- Procurement and compliance officers requiring objective test data in contracts and specifications.
- R&D teams comparing fastener types and optimizing installation patterns.
Keywords: ISO 1120:2025, conveyor belts, mechanical fastenings, static test method, tensile testing, fastening strength, textile conveyor belts.
Related standards
- ISO 283 - Textile conveyor belts - Full thickness tensile strength and elongation tests (referenced for tensile machine and strength comparison).
- ISO 18573 - Conveyor belts - Test atmospheres and conditioning periods.
- ISO 21183‑1 - Light conveyor belts (exclusion reference).
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