Pull Rope 6mm Double Braid Full Break Tests
# Complete 6mm Pull Rope Double Braid Breaktests
# Main Test
Below are the full 65 break tests of SGT Knots 6mm Double Braid Pull Rope. The tests were done on Balance Community’s break test machine, reading at 500 Hz, which Jerry Miszewski generously let us use for testing. Samples were between 2 and 3 meters long, and had a figure 8 knot terminating any end not being tested (on both sides for the bend tests, on one side for the device tests).
The cord in this test was about 1 year old and moderately used, although it showed a decent amount of wear on its sheath. Offcuts with notable abrasion spots were avoided where possible, although there was likely significant variation in wear across different test samples. The cord was broken because it had snapped in a progress capture during the tagging of the US Mile record attempt. It was donated by Vova Kozlov to allow testing for future projects and a better understanding of the failure during the mile tagging.
For full discussion of Pull Rope, see the main post.
| Break Type | Sample Number | Breaking Strength (kN) | Comments |
|---|---|---|---|
| Spliced Eye to Capstan | 1 | 5.46 | Broke at end of splice bury |
| Spliced Eye to Capstan | 2 | 7.15 | Broke at end of splice bury |
| Capstan to Capstan | 1 | 7.63 | |
| Capstan to Capstan | 2 | 6.79 | |
| Capstan to Capstan | 3 | 7.15 | |
| 8 to 8 | 1 | 5.63 | Broke at knot |
| 8 to 8 | 2 | 6.09 | Broke at knot |
| 8 to 8 | 3 | 5.81 | Broke at knot |
| Alpine Bend | 1 | 4.55 | Broke in alpine |
| Alpine Bend | 2 | 4.94 | Broke in alpine |
| Alpine Bend | 3 | 4.85 | Broke in alpine |
| Double Sheet Bend (Yosemite Finish) | 1 | 5.00 | Broke at sheet bend |
| Double Sheet Bend (Yosemite Finish) | 2 | 4.85 | Broke at sheet bend |
| Double Sheet Bend (Yosemite Finish) | 3 | 4.72 | Broke at sheet bend |
| Micro Trax | 1 | 3.33 | Desheathed |
| Micro Trax | 2 | 3.59 | Desheathed then broke |
| Micro Trax | 3 | 3.22 | Desheathed then broke |
| Doubled Micro Trax | 1 | 4.66 | Slipped at 4.4 |
| Doubled Micro Trax | 2 | 4.33 | |
| Doubled Micro Trax | 3 | 4.63 | |
| Mini Trax | 1 | 3.31 | Started slipping at 2.6 |
| Mini Trax | 2 | 3.15 | |
| Mini Trax | 3 | 3.09 | Started slipping 2.9, didn’t break just pulled core from sheath |
| Doubled Mini Trax | 1 | 4.11 | Wedged in between side plates, very difficult to remove |
| Mini Trax to Micro Trax | 1 | 5.59 | Broke in Mini, Mini Trax with tail loaded into Micro Trax and pulled from behind Micro |
| Mini Trax to Micro Trax | 2 | 5.12 | Broke in Micro, desheathed in Mini at 3, Mini Trax with tail loaded into Micro Trax and pulled from behind Micro |
| Mini Trax to Micro Trax | 3 | 5.39 | Broke in Mini, Mini Trax with tail loaded into Micro Trax and pulled from behind Micro |
| Pro Trax | 1 | 4.09 | Small slip at 2.6, desheathed |
| Pro Trax | 2 | 4.28 | Desheathed |
| Pro Trax | 3 | 3.85 | Desheathed |
| Pro Trax Longer Segment | 1 | 4.42 | Pulled with larger gap between 8 and device |
| Pro Trax Longer Segment | 2 | 3.67 | Pulled with larger gap between 8 and device |
| Pro Trax Longer Segment | 3 | 4.05 | Slipped at 3.6, Pulled with larger gap between 8 and device |
| Spoc | 1 | 3.09 | |
| Spoc | 2 | 3.44 | Desheathed then broke |
| Spoc | 3 | 3.41 | |
| Handled Ascender | 1 | 3.31 | Desheathed |
| Handled Ascender | 2 | 3.26 | Desheathed |
| Handled Ascender | 3 | 3.30 | Desheathed |
| Chained Handled Ascenders | 1 | 4.22 | Slipped at 3.5, 2 in line connected by carabiner |
| Chained Handled Ascenders | 2 | 5.55 | Slipped at 5, 2 in line connected by carabiner |
| Chained Handled Ascenders | 3 | 4.98 | Desheathed, 2 in line connected by carabiner |
| Sliding X Handled Ascenders | 1 | 4.52 | Desheathed, 2 in line connected by nylon sling sliding x |
| Sliding X Handled Ascenders | 2 | 5.55 | Desheathed, 2 in line connected by nylon sling sliding x |
| Sliding X Handled Ascenders | 3 | 5.55 | Desheathed, 2 in line connected by nylon sling sliding x |
| Roll N Lock | 1 | 3.59 | Slipped at 3.1, desheathed |
| Roll N Lock | 2 | 3.35 | Slipped at 2.9, broke |
| Roll N Lock | 3 | 4.23 | Slipped at 3.1, desheathed |
| Duck | 1 | 3.57 | Desheathed, core damage |
| Duck | 2 | 3.76 | Desheathed |
| Duck | 3 | 4.05 | Desheathed |
| Ropeman 1 | 1 | 1.59 | Slipped, damaged but didn’t desheath |
| Ropeman 1 | 2 | 3.52 | Slipped at 2, got stuck in side of cam until breaking |
| Ropeman 1 | 3 | 2.11 | Slipped, damaged but didn’t desheath |
| Rock Exotica Cam | 1 | 4.28 | Started slipping at 3.5, desheathed |
| Rock Exotica Cam | 2 | 4.18 | Started slipping at 2.1, no full failure but cord very damaged |
| Rock Exotica Cam | 3 | 4.41 | Started slipping at 2.1, desheathed |
| Petzl Rescuecender (Old Style) | 1 | 1.56 | Fully slips |
| Nite Ize CamJam XT | 1 | 3.89 | Slipped at 3.3, continued slipping with tension around 1 |
| 4 Wrap Prusik, Pull Rope | 1 | 5.2 | Slipped at 2.1, 3.7, broke, melted to rope |
| 4 Wrap Prusik, Pull Rope | 2 | 5.7 | Slipped at 1.7, 3.7, 4.8 broke at 8 knot |
| 4 Wrap Prusik, Pull Rope | 3 | 6.07 | Slipped at 1.7, 4.3, 5.7, broke at 8 knot |
| 4 Wrap Prusik, 6.8mm Hollow Block | 1 | 0.78 | Slipped, never caught, newer rectangular style |
| 4 Wrap Prusik, 5mm Hollow Block | 1 | 2.67 | Slipped, didn’t catch or damage rope |