1. Muaj cov tshuaj tiv thaiv zoo heev, tiv thaiv qee yam acidity thiab alkalinity, thiab muab cov tshuaj tiv thaiv zoo tiv thaiv cov tshuaj corrosive xws li cov kuab tshuaj thiab roj av.
2. Cov khoom siv lub cev zoo, ua kua muag ua haujlwm zoo, puncture tsis kam, thiab kev sib txhuam tsis kam.
3. Cov style yog xis nyob, thiab cov hnab looj tes tsim raws li ergonomics muaj cov ntiv tes nkhaus kom xis nyob, uas muaj txiaj ntsig zoo rau cov ntshav ncig.
4. Nws tsis muaj cov proteins, amino compounds, lossis lwm yam khoom tsis zoo, thiab tsis tshua muaj kev ua xua.
5. Lub sij hawm luv luv degradation, yooj yim los tuav, thiab muaj txiaj ntsig zoo rau kev tiv thaiv ib puag ncig.
6. Tsis muaj silicon tivthaiv, nrog rau qee yam khoom tiv thaiv zoo li qub, tsim nyog rau kev tsim khoom ntawm kev lag luam hluav taws xob.
7. Tsis tshua muaj tshuaj lom neeg seem, cov ntsiab lus ion tsawg, thiab cov ntsiab lus me me, tsim nyog rau qhov chaw huv huv nruj.