I'm talking about 10mm Sterling HTP, aka Snakebite, as marketed and elongation tested by Tobe Sherrill. The numbers come from the catalog, rope comparison chart.
That first link's text says "less than 1% stretch per 300 pound load".
This 100% all-polyester rope is another example of Sterling vision and innovation. HTP™ Static offers climbers, cavers, and other recreational enthusiasts significant advantages over using standard nylon static ropes in certain recreation situations. Activities such as hauling, jumaring, and rappelling are more efficient with a low elongation rope. HTP, with its less than 1% stretch per 300-pound load, makes these activities far more time and effort efficient. HTP provides better UV resistance, which is critical for glacier travel, expeditions, and big walls where ropes are exposed to ultra-violet light (UV), for long periods of time. Lastly, it retains its suppleness and smooth handling far longer than traditional static ropes, even after repeated use. Since HTP Static is a naturally dry product, your ropes will always stay dry. This maintains performance, strength, and elongation characteristics. Sterling's 5/16" and 3/8" provide high strength and low stretch, ideal for lightweight fixing and hauling/tag lines. The 7/16" larger diameter is better suited for climbing situations where there will be excessive amounts of heavy jumaring, hauling, and high exposure to sharp rock. HTP Static is also available in 1/2" and 5/8". However because of their size and extra weight, they are better suited for tower construction, short haul helicopter rescue, high angle technical rescue, and industrial safety applications.
Warning: HTP should never be used in situations where any potential for shock-loading (such as a fall) may occur. It will result in very high impact forces. In these situations, a nylon static or dynamic rope would be more appropriate.
View color options for HTP Static ropes.
View the technical specs for HTP™ Static.
Technical Specs for HTP Static: All Polyester Static Rope
Diameters: mm 9mm 10mm 11mm 13mm 16mm
Diameters: inches 5/16" 3/8" 7/16" 1/2" 5/8"
mbs: lb 5058 5981 7667 9084 11,962
mbs: kN 22.5 kN 26.6 kN 34.1 kN 40.4 kN 53.2 kN
Weight (lb/100’) 4.2 5.3 6.5 8 12.5
Elongation (at 10% of MBS) 2.5% 1.7% 2.9% 2.0% 1.8%
Elongation (at 300 lbs.) 1.30% 1.0% 1.7% 0.8% 0.9%
Swl(10:1) 504 lbs 598 lbs 767 lbs 908 lbs 1196 lbs
NFPA: 1983,2006 no yes yes yes yes
Well, I reckon they must be refering to the larger diameters.
More confusion over testing methods, I suppose.
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