Lub ntsiab tseem ceeb uas yuav tsum tau xav txog thaum xaiv lub zipper waterproof yog: qhov zoo nkauj ntawm cov khoom thiab cov txiaj ntsig ntawm cov dej tsis zoo. Waterproof zippers yuav tsum tau txiav txim siab los ntawm cov hauv qab no:

1. Cov yeeb yaj kiab zipper waterproof tsis tsim kua muag.

2. Smoothness, feem ntau ntseeg tias qhov zoo dua qhov smoothness ntawm lub zipper, qhov zoo ntawm cov zipper waterproof.

3. Qhov saum npoo ntawm cov yeeb yaj kiab waterproof zipper yog du thiab muag heev, nrog kev zoo nkauj zoo ib yam li tawv, uas yog cov tsos ntawm cov zippers zoo.

4. Waterproof effect: Qhov loj ntawm nruab nrab seam yog ncaj qha ntsig txog cov nyhuv dej tsis zoo ntawm cov zipper waterproof. Yog tias nws loj heev, nws yuav pom tseeb tias tsis muaj cov nyhuv dej tsis zoo thiab poob lub ntsiab lus ntawm lub zipper waterproof nws tus kheej.

5. Cov xim sib txawv ntawm cov xim tsis muaj dej tsis zoo yuav tsum me me. Qhov sib txawv ntawm cov xim ntawm cov zipper daim kab xev thiab cov ntaub yog cov xim sib txawv. Cov xim ntawm zaj duab xis nto thiab xim ntawm daim kab xev yuav tsum tau tswj tsis pub dhau 5 feem pua.

6. Kev pabcuam lub neej, qhov zoo ntawm cov yeeb yaj kiab txuas nrog lub zipper tsis muaj dej yog ncaj qha ntsig txog kev pabcuam lub neej ntawm lub zipper waterproof