02. Borosilicate iav yog dab tsi

Borosilicate iav yog hom iav uas muaj tsawg kawg yog 5% boric oxide. Cov oxic oxide ua rau cov iav kom tiv thaiv huab cua sov, thiab ua rau nws lub zog tsis zoo rau cov tshuaj muaj zog. Cov iav no yog nrov heev hauv kev tsim cov twj paj nruag, thiab nws yog ib zaug siv los ua iav rau chav ua noj thiab. Niaj hnub no, dej qab zib kua yog lub iav xaiv rau chav ua mov, vim qhov tseeb tias nws yog pheej yig dua los tsim.

Tswv yim ntawm borosilicate iav feem ntau yog muab tso rau Otto Schott, German glassmaker uas ua haujlwm nyob rau hauv lub xyoo pua puv 19. Lub sijhawm xyoo 1800, cov txheej txheem rau kev ua kom zoo dua qub, thiab xyoo 1915, muaj cov kabmob ntawm cov khoom ua noj ua haus luam yeeb nyob hauv qab Pyrex. Vim hais tias nws muaj zog thiab ruaj khov dua cov lus pom zoo iav, nws muaj ntau qhov kev siv tau.

Cov iav no tsis yog txua tsis txaus, ntawm chav kawm. Nws yuav tawg yog tias raug tshua heev thiab radical kub hloov, lossis yog tias nws poob. Cov iav ntau dua yuav tawg los yog snap dua rau kev tawg, txawm li cas los, ua kom nws muaj kev nyab xeeb nyob rau hauv qhov teeb meem uas tawg lawm yog kev txhawj xeeb. Yog tias cov khoom ua nrog cov iav tawg, nws feem ntau yooj yim dua thiab muaj kev ruaj ntseg los ntxuav dua li cov iav tawg.