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Climbing and Working at Height

Dynamic, Semi Static or Static?

Ropes used for industrial access, climbing and fall arrest can be classified as three types:
Dynamic = elongation at break above 40%
Semi-static = elongation at break 35-40%
Static = elongation at break below 35%

As nylon <Actinic:Variable Name = 'polyamide'/> is the most stretchy rope it is used almost exclusively as semi static and dynamic lines. But Nylon in its yarn state will only stretch 16-27% so extra stretch is added by braiding and by special heat treatments to ensure a 40% stretch is achieved.

The stretch is an important safety factor as the G force of a falling object can be roughly calculated by the fall distance divided by the arrest distance. Therefore a person falling 2 m being arrested by a nylon rope which stretch 200 mm would be subjected to a G force of 10 but if the rope was dyneema with just a 2 mm stretch, the G force would be 1000 and possibly fatal.

Dynamic and Semi Static lines are classed as PPE [Personal Protective Equipment] Category 3, C type inspection. They must be made by a ISO 9001 registered company.

Intervention Semi Static 11 mm diameter Black Rope (50 m Hank)

Intervention Semi Static 11 mm diameter Black Rope (50 m Hank)

Price: 117.79 (Including VAT at 20%)

Lyon Dynamic Rope 11 mm diameter (50 m hank)

Lyon Dynamic Rope 11 mm diameter (50 m hank)

Price: 120.00 (Including VAT at 20%)

Beal Rando Golden Dry 8 mm - Touring Rope - 30 m

Beal Rando Golden Dry 8 mm - Touring Rope - 30 m

Price: 60.00 (Including VAT at 20%)

Beal Rando Golden Dry 8 mm - Touring Rope - 48 m

Beal Rando Golden Dry 8 mm - Touring Rope - 48 m

Price: 101.00 (Including VAT at 20%)