In reply to EdS:
> Cavers use semi static Type A or B rope. Or even Type L cord for expedition ....not static
The manufacturers and sellers of rope conforming to EN1891 type A or B* use the terms "static", "semi-static" and "LSK"(Low Stretch Kernmantle) more or less randomly and interchangeably. The term "static" is perhaps a bit old-fashioned now, "LSK" more modern, but they are all the same.
* Climbers looking for a general purpose rope for rigging, abseiling and occasional ascending will be wanting type-A btw. It's generally stronger and more robust. Anyone who really wants a type-B rope will understand the difference and know why they want it.
The standard sets a maximum amount of elongation under load, but also a maximum impact force in a drop test (similar to how dynamic ropes are tested). In effect that means there is also a minimum amount of stretch - an upper bound on how 'static' they are allowed to be. (Regardless of whether the manufacturer calls it "static", "semi-static" or whatever.)
If you're interested in the minutiae* of how the test results for one rope compare to another, you need to forget about what the manufacturer calls it and look at the specs.
* A climber just wanting a general purpose rigging/abseiling rope really doesn't need to be - as long as it meets the standard it'll be fine.
> Sailing does use static- definitely not something to abseil on
Ropes are available for various purposes, including sailing, that are too static to be certified to EN1891 (because they would fail the 'drop test') and yes you are absolutely right, they're definitely not something you would want to buy for eg: abbing in to a sea cliff.
Post edited at 11:03