Title: +038=627.001-##001T_03-Fasadevasksystem NorAcon - International Code of Practice (ICOP).pdf
IRATA International code of practice for industrial rope access Part 2 of 5: Detailed guidanceRopes made from high modulus polyethylene, high tenacity polypropylene and aramid 2.7.2.2 may be considered for use in exceptional circumstances, and only if appropriate anchor line devices (e.g. descending devices) are available. Ropes made from these materials might be useful where there is severe chemical pollution. However, polyethylene and polypropylene have much lower melting temperatures than polyamide or polyester and are more easily affected by frictional heat, for example from descending devices. Dangerous softening of polypropylene occurs at temperatures as low as 80 C. Aramid has a very high melting point but poor resistance to abrasion, ultraviolet light and repeated bending. Both polyester and aramid fibres have lower elongation characteristics than polyamide, aramid being the lowest.