Kev xaiv cov khoom sib sib zog nqus nqus pwm

Kev xaiv cov khoom siv sib sib zog nqus nqus pwm yog qhov tseem ceeb cuam tshuam rau lawv cov kev ua haujlwm thiab kev pabcuam lub neej, feem ntau yuav tsum tau xav txog cov hauv qab no:
1. Lub zog thiab hardness: sib sib zog nqus nqus pwm yuav tsum muaj lub zog txaus thiab tawv tawv kom tiv taus kev ua haujlwm hauv siab.
2. Hnav tsis kam: Vim muaj kev sib cuag ntawm cov pwm sib sib zog nqus thiab cov ntawv hlau, lawv yuav tsum muaj kev hnav zoo.
3. Corrosion resistance: Rau qee qhov kev ua haujlwm ntawm cov ntawv hlau ua haujlwm, cov pwm saum npoo yuav tsum muaj qee qhov kev tiv thaiv corrosion.
4. Kev ua tau zoo: Txhawm rau kom ntseeg tau tias cov pwm tsim tau zoo geometric raug, nws yog ib qho tsim nyog los xaiv cov ntaub ntawv uas yooj yim rau kev ua.