1, xaiv cov xim zoo nkauj thiab ci ntsa iab, sab hauv thiab sab nraud ntawm phab ntsa du, tiaj tus, tsis muaj npuas, kev nyuaj siab, impurities thiab lwm yam kev ua haujlwm tsis xws luag cuam tshuam rau cov yeeb nkab PVC dej.
2, txhawm rau saib seb qhov kev txheeb xyuas cov khoom puas tiav, cov yeeb nkab PVC yuav tsum yog lub npe ntawm cov chaw tsim khoom lossis cov cim lag luam, hnub tsim khoom, lub npe khoom, qhov loj me (S lossis en), kev siv tus qauv tooj, thiab lwm yam, fittings yuav tsum yog cov khoom npe (PVC), nominal sab nraud txoj kab uas hla, yeeb nkab series S, thiab lwm yam., cov lus yuav tsum meej, thiab xyuas seb lub logo thiab qhov tiag match.
3, yuav tsum yuav tib hom PVC yeeb nkab thiab fittings, vim hais tias cov khoom sib txawv ntawm cov khoom yuav tsis yog tib yam raw cov ntaub ntawv, cov PVC yeeb nkab thiab fittings fusion yuav ua rau muaj kev cuam tshuam tsis zoo, kev siv mus sij hawm ntev yuav ua rau muaj kev sib txuas ntawm kev sib koom ua ke.