Kuwunika kwa Nsalu:

Nsalu iyi imatha kukumana ndi GB/T standard, ISO standard, JIS standard, US standard.Nsalu zonse zidzawunikiridwa 100 peresenti musanatumize malinga ndi American four point system standard.

Mawu akuti "kukana madzi" amatanthauza digiri yomwe madontho amadzi amatha kunyowa ndikulowa mu nsalu.Anthu ena amagwiritsa ntchito mawu akuti osamva madzi komanso oletsa madzi m'malo osiyanasiyana, pomwe ena amatsutsa kuti kusamva madzi ndi madzi ndi chimodzimodzi.Kwenikweni, nsalu zosamva mvula zomwe zimadziwikanso kuti zosamva madzi zili pakati pa nsalu zosagwiritsa ntchito madzi komanso zosalowa madzi.Nsalu zosamva madzi ndi zovala zimayenera kukupangitsani kuti muziuma mumvula yamphamvu kapena yamphamvu.Choncho amapereka chitetezo chabwino ku mvula ndi chipale chofewa kusiyana ndi nsalu zopanda madzi.Komabe, pakagwa mvula kwanthawi yayitali, zovala zopangidwa ndi nsalu zosagwira madzi sizingakutetezeni kwa nthawi yayitali chifukwa zimalola kuti madzi adutse.M'nyengo yoipa, izi zimapangitsa kuti zikhale zodalirika kusiyana ndi zovala ndi zida zopumira madzi (zomwe zimagonjetsedwa ndi kuthamanga kwa hydrostatic).
Tikayerekeza mitundu itatu ya nsalu zotayira madzi, nsalu zosagwira madzi zimakhala zofanana kwambiri ndi madzi kuposa nsalu zopanda madzi monga, mosiyana ndi zotsirizirazi, zimatha kuthamangitsa chinyezi ngakhale popanda kuthandizidwa ndi hydrophobic.Izi zikutanthauza kuti kusagwira madzi kumatanthauza mphamvu yachibadwa ya nsalu kuti isatseke madzi.Kuchuluka kwa kusagwira madzi kumayesedwa pogwiritsa ntchito hydrostatic pressure test kotero, mwaukadaulo, nsalu zosalowa madzi sizimamvanso madzi (zindikirani kuti zosiyana sizoona nthawi zonse).Nsalu zolimbana ndi mvula ziyenera kupirira kupanikizika kwa hydrostatic kwa mgawo wamadzi wa 1500 mm.
Zovala zosamva mvula nthawi zambiri zimapangidwa kuchokera ku nsalu zolimba zopangidwa ndi anthu monga (ripstop) polyester ndi nayiloni.Nsalu zina zolukidwa kwambiri monga taffeta ngakhale thonje zimagwiritsidwanso ntchito popanga zovala ndi zida zosagwira madzi.