Overview
ISO 17745:2016 defines steel wire ring net panels - terminology, material and dimensional specifications, and test methods for panels used to retain unstable slopes and to control rockfall, loose debris and snow avalanches. The standard covers products made from metallic‑coated or advanced‑metallic‑coated steel wire and specifies properties, sampling, testing and documentation requirements. It does not apply to anchors or soil nails used to fix mesh to slopes.
Key topics and technical requirements
- Scope and definitions: precise terms such as wire ring, nominal/real wire diameter, wire ring size and ring structure are defined to ensure consistent product descriptions.
- Material and wire properties:
- Minimum tensile strength for ring wire: 1 380 MPa (tested per ISO 22034‑1).
- Metallic and advanced metallic coatings are required for corrosion protection; coating types and classes are linked to accelerated corrosion testing.
- Corrosion resistance and ageing:
- Salt‑spray (neutral) testing per ISO 9227 is used to classify coating performance. Different coating classes (e.g., Zn, Zn‑Al, advanced coatings) have specified exposure durations and acceptance criteria (maximum percentage of dark brown rust).
- Mechanical tests:
- Net tensile and ring breaking tests (three‑ring chain) are defined, with test machines calibrated to ISO 7500‑1 class 1.
- Load bearing capacity tests (Annex B) use a hemispherical load‑sharing device to load panels perpendicularly to the plane to assess performance under impact or concentrated loads.
- Product dimensions and manufacturing:
- Standard ring sizes, number of windings and wire diameters are provided (see Table 1 in the standard); custom sizes allowed by project agreement.
- Sampling, inspection and documentation:
- Manufacturer control is required; certificates can be supplied according to ISO 10474 listing product description, coating type/class, breaking loads, panel dimensions and corrosion test exposure hours.
Applications and typical users
- Practical uses: rockfall protection, slope retention, loose debris control along roads, highways and railways, urban protection, mine and quarry stability works, and snow avalanche protection.
- Who uses the standard:
- Geotechnical and civil engineers for specifying protective mesh systems.
- Manufacturers and fabricators of ring net panels for quality control and product certification.
- Contractors and specifiers for procurement and installation contracts.
- Inspection and QA personnel for acceptance testing and documentation.
Related standards
Keywords: ISO 17745:2016, steel wire ring net panels, rockfall protection, avalanche protection, corrosion resistance, metallic coating, load bearing capacity, tensile strength, neutral salt spray, geotechnical engineering.