Teufelberger's new Platinum rope.

Re: Teufelberger\'s new Platinum rope.

The statistic for rope stretch is vague. I agree with TreeWill, there should be a way of comparing stretch.

Many years ago when I was learning about rope performance I had this same question. When I was at Expo I spent about an hour talking with Dick Hilebrand. He told me that at that time the Cordage Institute didn't have a standardized test for stretch. Maybe there is an industry accepted test now, I don't know.

Dick explained how Yale came up with their stretch numbers at the time. A new rope was taken from the machine and loaded to a percentage of its MBS at a slow rate. Not a jerk, gentle pull. Then the rope was allowed to relax. This was repeated with ever increasing loads up to another percentage of MBS. Once the rope had been pre-stretched and allowed to relax they started to gather the data for stretch.

The number was based on the percentage of MBS at an applied rate.

Try pulling on a bungee cord or a rubber band. YOu'll understand a bit more about this elusive stretch rating.
 
Re: Teufelberger\'s new Platinum rope.

EN 1891 Type A ropes, such as the Platinum, shall have an elongation less or equal to 5% when loaded with 150kg.
To my understanding the EN testing procedures are perfectly specific as to how to test ropes for elongation in the sense of the test being replicable.
 
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