Area of Application

The ISOSTOP systems are generally characterized by a slim design. This makes transport and installation in high alpine terrain much easier. They are an effective and efficient system used to protect life, infrastructure and other elements at risk. ISOSTOP 1:1 scale tested carrying both European and Swiss certifications.

Post Bypass

The bypass rope on the posts allows unhindered movement of the net surface and the bearing ropes in the event of an incident. This avoids causing high peak loads and at the same time increases the remaining usable height of the barrier.

Rope Guidances

The upper and lower bearing ropes are led through a rope guidance that is integrated on each post head and base plate. Each guidance provides large curved surfaces to help protect the ropes and allow unobstructed movement. The guidance is designed to be robust and with no movable parts in order to ensure longevity and zero maintenance.

Integrated Ladder

Posts from this ISOSTOP system are built from RHP profiles that provide high torsional rigidity and extremely low weight. The detachable steps are installed after transport and enable the highest level of work safety.

Base Plate

The universal base plates of the ISOSTOP systems can be used for compression-tension anchoring, as well as for placement on foundations or walls. The unique mounting bolt enables free-standing installation of the posts, which saves significant time, especially when assembling a helicopter.

ISODISK Brake Element

The ISODISK is a modular disc brake system that ensures linear energy absorption through deformation and the breaking of material bridges. This means that the brake is completely insensitive to environmental and climate influences in the long term. Due to its reliability, compact design and modular structure, the brake forms the core element of all ISOSTOP Ev systems up to 3000 kJ.
ModelISOSTOP 250 E
StyleHinged System
Energy Class1
Maximum Energy Level Certified/Tested [kJ]250 / 270
(92 / 100)
Service Energy Level Certified/Tested [kJ]85
Approved Heights [m (ft)]2.5 - 3.0
(8.2 - 9.8)
VerificationFull Scale Tested
CertificationETAG27 / EAD 340059-00-0106 certified
Test Report Summary
Test Height [m (ft)]2.0
Maximum Elongation [m (ft)]3.8
Residual Height ClassA (≥50%)
Component FailureNone
Primary Net Opening [m (ft)]0.1
Secondary Mesh50/50/2.5
European Technical Assessment ETA
ETA NumberETA-22/0885
Issuing BodyTSUS Building Testing and Research Institute
Date of IssueJanuary 17, 2023
Certificate of Conformity
Report Number1301-CPR-2137
Issuing BodyTSUS Building Testing and Research Institute
Date of IssueMarch 3, 2023
Primary Net
ModelFlexnet MW 250
TypeSteel Wire Cable with Clamps
Rope Diameter [mm (inch)]8.0
Rope Construction6 x 7 SC
Corrosion ProtectionZn or ZnAl (Class A or B)
Mesh Size [mm (inch)]250 x 250
(9.84 x 9.84)
Unit Weight [kg/m2 (lb/ft2)]3.04
Mesh Tensile Strength calculated [kN/m (lbf/ft)] n/a
Connection to Main RopesThreaded
Connection to Adjacent Panel3/8" Shackle

The foldable FLEXNET can be pre-assembled on the posts. The net is extremely robust and elastic thanks to the structure of individual wire rope strands. After an event, the flexible wire rope ensures that it returns to its original geometry and thus significantly reduces maintenance costs.

Bearing Ropes
Quantity per fence segment2
Rope Diameter [mm (inch)]18
Corrosion ProtectionZn or ZnAl (Class A or B)
Brake Elements per rope2
Brake Element ModelISODISK 50-1.25
Middle Ropes
Quantity per fence segmentn/a
Rope Diameter [mm (inch)]n/a
Corrosion Protectionn/a
Brake Elements per ropen/a
Brake Element Modeln/a
Retaining Ropes
Quantity per fence segment2
Rope Diameter [mm (inch)]12
Corrosion ProtectionZn or ZnAl (Class A or B)
Brake Elements per ropen/a
Brake Element Modeln/a
Support Structure
Post TypeRHS 120/60/4
Integrated Laddern/a
Rope GuidesIntegrated
Post Weight as tested [kg (lbs)]37
Base Plate ConnectionTongue and Pin
Base Plate Foot Print [mm (in.)]480 x 300
(19 x 12)
Base Plate Weight [kg (lbs)]19
Anchors per base plate2 / 4
Post Base Support
1.Post; 2.Rope Guide; 3.Base Plate; 4.Hinge Pin; 5.Anchor Nut; 6.Washer; 7.Anchor; 8.Micropile Tube
Retaining Rope Anchorage
1.Retaining Rope; 2.Anchor Eye; 3.Anchor
Lateral Anchorage
1.Side Stabilization Rope; 2.Upper Bearing Rope; 3.Lower Bearing Rope; 4.Brake Element; 5.Anchor Eye; 6.Anchor
Anchor Forces
Base Plate Tension (Loose Ground) FLGA,ten [kN (kips)] 141
Base Plate Compression (Loose Ground) FLGA,pres [kN (kips)] 100
Base Plate Shear (Rock/Foundation) FMF,shear [kN (kips)] 25
Lateral Anchor Fk,lat [kN (kips)] 100
Retaining Rope Anchor Fk,ret [kN (kips)] 46
Typical Recommended Anchors Based on Steel Grade
Anchor PositionQuantity per 50 m 10 m post spacing500/550 MPa (e.g. GEWI)670/800 MPa (e.g. GEWI Plus)min 470 MPa (e.g. IBO)
Base Plate122522n/a
Typical Cross Section
1.Post; 2.Rope Guide; 3.Base Plate; 4.Diagonal Wire Rope Net; 5.Retaining Rope; 6.Anchor Eye; 7. Retaining Anchor; 8.Anchor
Typical Layout
1.Post; 2.Upper Bearing Rope; 3.Lower Bearing Rope; 4.Retaining Rope; 5.Side Stabilization Rope; 6.Retaining Anchor; 7.Lateral Anchor