1. Xim: cov khoom siv siab dawb iav lub raj mis muaj qhov zoo dawb thiab siab pob tshab; siv lead ua dawb khoom iav raj mis muaj cov yam ntxwv ntawm siab refractive index, crystal ntshiab thiab siab ceev.
2. Cov khoom siv raw: Cov khoom siv raw rau cov iav dawb iav fwj yuav tsum yog cov ntaub ntawv zoo nrog ob peb impurities thiab siab purity. Yog tias tsim nyog, cov khoom siv raw yuav tsum tau ntxuav nrog cov kua qaub kom tshem tawm cov impurities xws li hlau hauv cov ntaub ntawv raw; qhov thib ob ntawm cov ntaub ntawv raw rau siv lead ua dawb iav wine fwj iav fwj nrog cov ntsiab lus silica siab thiab cov ntsiab lus silica siab muaj cov yam ntxwv ntawm siab refractive index, crystal ntshiab thiab siab ceev.
3. Qhov hnyav: cov khoom siv dav dav ntawm cov iav dawb lub raj mis yog 180g, 280g, 480g, 520g; Cov khoom siv dav dav ntawm cov iav dawb iav lub raj mis yog 220g-420g, 550g, 580g, 620g, 650g, 680g, 750g, 850g.
4. Cov txheej txheem ua tiav: Lub raj mis dawb dawb yog ua tiav los ntawm kab tshuab (tshuab), thiab pwm feem ntau xav tau 1-2 pawg. Crystal dawb iav wine fwj feem ntau ua tiav manually, thiab cov pwm xav tau 4-5 pawg.