Hard iav qhov muag teev, ua los ntawm borosilicate iav, muaj qhov kub thiab txias tsis kam, tshuaj tsis kam, txhua yam muaj zog, thermal stability, thiab zoo heev optical clarity. Lawv yog qhov tseem ceeb hauv kev lag luam teeb pom kev zoo rau LED encapsulation, muab kev tiv thaiv thiab kev ruaj ntseg, raws li cov vaj tse rau cov fluorescent raj, kom ruaj khov thiab muaj txiaj ntsig lub teeb kis tau tus mob, thiab hauv cov teeb pom kev tshwj xeeb LED teeb pom kev zoo xws li tsheb teeb thiab cov khoom siv kho mob, kom ntseeg tau tias kev ua tau zoo hauv kev xav tau ib puag ncig.