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Rozumím
Prodyšnost
U sportovního oblečení je potřeba sledovat nejen odolnost vůči vodě, ale zároveň paropropustnost neboli prodyšnost (schopnost odvodu tělesné vlhkosti pryč od těla).
Prodyšnost se klasifikuje hodnotou RET, která vyjadřuje prodyšnost látky (energii), která je nutná k odpaření určitého množství vody při jasně specifikované teplotě a vlhkosti. Čím je hodnota RET nižší, tím je látka prodyšnější.
Prodyšnost je schopnost materiálu propouštět vodní páry produkované lidským tělem do okolního prostředí. Je velmi závislá na okolních klimatických podmínkách, zátěži a dalších faktorech. Podstatné je pro lidské tělo těchto par se přes oblečení zbavit, jinak by došlo k přehřívání organismu. Prodyšnosti výrazně napomáhá odvětrávání, proto se některé oblečení vyrábí s větracími otvory.
RET < 6 – velmi dobrá ( < 20 000 g/m2 x 24 hodin )
RET 6 – 13 – dobrá ( 9000 – 20 000 g/m2 x 24 hodin )
RET 13 – 20 – uspokojivá ( 5000 – 9000 g/m2 x 24 hodin )
RET > 20 – neuspokojivá ( < 5000 g/m2 x 24 hodin)
[]
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