1. Lub khob dej qab zib lime khob dej kuj yog lub khob dej ntau tshaj plaws hauv peb lub neej. Nws cov khoom tseem ceeb yog silicon dioxide thiab sodium oxide, calcium oxide. Hom khob dej no yog tsim los ntawm kev siv tshuab thiab phau ntawv tshuab, thiab nws yog pheej yig thiab feem ntau siv hauv lub neej txhua hnub. Yog hais tias lub khob dej qab zib-txiv qaub yog siv rau haus cov dej kub, nws feem ntau yuav tsum tau tempered thaum nws tawm hauv lub Hoobkas, txwv tsis pub lub khob yuav tawg yog tias qhov kub thiab txias sib txawv loj heev.
2. High borosilicate iav dej khob, uas muaj npe tom qab cov ntsiab lus siab ntawm boron oxide. Cov tshuaj yej teeb thiab cov tshuaj yej feem ntau siv los ua tshuaj yej tuaj yeem tiv taus qhov kub thiab txias hloov tsis tau tawg. Tab sis hom iav no zoo li nyias, lub teeb hauv qhov hnyav, thiab xav tias tsis zoo.
3. Crystal iav dej khob, hom iav no yog cov khoom lag luam qib siab hauv iav, vim tias nws muaj ntau yam hlau, nws cov refraction thiab transparency yog ze heev rau ntuj siv lead ua, thiab nws yog hu ua crystal iav. Muaj ob hom siv lead ua iav, cov iav siv lead ua iav thiab cov iav tsis muaj hmoov lead. Lead Crystal iav tsis pom zoo rau kev noj, tshwj xeeb tshaj yog thaum haus cov kua qaub los ntawm khob dej. Cov hmoov txhuas yuav yaj mus rau hauv cov kua qaub, thiab kev siv ntev ntev yuav ua rau muaj tshuaj lom lom. Lead-free crystal yog tsis muaj txhuas thiab tsis muaj teeb meem rau lub cev.
