I have to respond to that last one about Sterling. I have been using Sterling HTP static for the last 6 years and want to set the record straight. I have tried several types of their static and the HTP-which is polyester is the best I've used and yes there are certain rigging restrictions. I have distributed several pieces(I get prime remainders from the factory) to folks with this caveat. 'Don't rig it like american rope!'
Yes the soft supple sheath is less abrasion resistant than those 'cable' ropes-you know what I mean. The ones that the owner has never washed and asks you to carry and coil!
.The Sterling polyester (mostly 10mm) has *very*little bounce less than 2% it climbs like cable with virtually zero bounce on lengths of <30 meters. The 10 mm diameter feeds doesn't stick in ascenders, but the soft hand requires practice to feed easily. Another benefit is carrying in your cave pack is a breeze if you have in-cave drops far from the entrance through torturous passage. Again european rigging with NO rub points is important. As for the black rope mentioned, I can't say, I've never seen it, it must have been an earlier prototype that obviously didn't succeed. They do make a nylon static line that is OK, made for certain uses, but I prefer the polyester for cave use. The search and rescue manager at Sterling, recently told me they were going to try HTP in 9mm. I haven't seen it yet, but if it lives up to the low bounce of its bigger brother, it could be a great push rope. Stay tuned.