1. Muaj zog corrosion kuj, tsis cuam tshuam los ntawm corrosive av thiab ntau yam dej haus;
2. Sab hauv phab ntsa yog du, thiab kev sib txhuam tsis sib haum yog me dua li cov khoom siv sib xyaw;
3. Cov kav dej thiab fittings yuav tsis xeb, yog li yuav tsis muaj kev yaig thiab shrinkage hloov hauv lawv;
4. Cov phab ntsa sab nrauv ntawm lub tsev yuav tsis muaj kuab paug los ntawm xeb ntawm cov kav dej, kom ntseeg tau tias tus nqi ntawm lub tsev yuav tsis raug puas tsuaj;
5. Muaj ntau yam thiab ua tiav cov yeeb nkab fittings, uas tuaj yeem tsim nyog rau ntau yam kev tsim thiab kev teeb tsa;
6. Yooj yim rau nruab, tsis tas yuav tsum muaj kev saib xyuas tsis tu ncua;
7. Qhov hnyav yog ib feem tsib ntawm cov yeeb nkab hlau cam khwb cia, uas yooj yim rau kev thauj thiab khiav lag luam;
8. Cov kua nplaum yog siv rau kev sib txuas, uas yog yooj yim, ceev, kev lag luam thiab kev ua haujlwm zoo;
9, tasteless, tsis muaj tshuaj lom;
10. Resistant mus rau ntau yam tshuaj, nrog rau muaj zog acids thiab alkalis;
11. Tsis muaj kab mob;
12. Anti-termite thiab huab cua tsis kam;
13. pheej yig dua li cov khoom siv ib txwm siv;
14. Lub neej kev pabcuam tuaj yeem ncav cuag ntau dua 50 xyoo raws li kev siv ib txwm siv.