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Mammutul este la fel de vechi in domeniu, in jur de 150 ani, au ambele firme.
Mammut este o firma care azi face si articole de imbracaminte dar initial, acum 150 ani, a fost atelier de corzi, pe atunci franghii.
La ce fac momentan ma gandesc ca ambele sunt foarte bune, consideretul principal este rezistenta in timp.
Un minus mare pe care l are aceasta coarda de la Mammut, unul care nu ma dezavantajeaza, este ca retine aprox. 40% apa. Asta inseamna dupa standardul UIAA pentru rezistenta la apa, ca depaseste cu foarte mult limitele si in mediu cu umiditate ridicata, apar probleme la manevrele de belay si nu numai, asa cum citez mai jos de pe site ul oficial UIAA:
" "When a rope is full of water, it becomes heavy, difficult to use in belay devices and descenders,” said Michael Beal of Beal, a European rope manufacturer which worked with the UIAA to develop the standard. "It may also freeze and become impossible to use.”
Beal said the new standard, which is a great opportunity to provide good information to users, was developed to ensure that water absorption in ropes did not lead to safety issues.
To qualify for the new standard, a rope sample is subjected to subject to light abrasion over its entire surface, equivalent to a few days’ use. The rope is then soaked for 15 minutes following a precise procedure.
Ropes with a surface treatment only, can’t succeed in the test and, thus, can’t be qualified as "UIAA Water Repellent,” said Beal.
To pass the test at a certified laboratory, the amount of absorbed water must not be greater than 5% of the rope’s weight. For comparison, a non-treated rope absorbs around 50% of water in this test, and ropes labelled as "dry” but lacking adequate treatments can absorb between 20% and 40% of water. "
Va multumesc si va doresc ture cat mai frumoase si insorite !
Mesaj modificat de autor!
Sâmbătă, 16 aprilie 2016 - 10:19