EHP core yarns for High Performance Roundslings have less than one third the stretch of high tenacity polyester and therefore are less “forgiving”.
- Polyester elongation is ~12% at break vs. less than 4% for EHP core yarns.
- At working load, EHP stretch is well under 1%.
- Best results are obtained when the EHP wraps are kept as even in length and tension as possible.
- Slack or drooping ends will NOT “pull out” and equalize like they do in polyester roundslings.
Proof testing (five to ten times at 2x working load) is recommended for all High Performance Roundslings. Per the upcoming WSTDA RS-1 HP standard, maximum temperature for all HMPE roundslings is 158 F (70 C).
- Typically, the wider the jacket the better the EHP results.
- Results among different sling manufacturers can vary widely based on production methods.
- ALL FABRICATORS MUST DO THEIR OWN BREAK TESTING TO VERIFY EHP RESULTS.
- For higher capacity slings, it is recommended to us EHP in multiple bundles.
- EHP efficiency is increased by separating into multiple yarn bundles.