Fireproof iav qhov rooj yog qhov zoo iav qhov rooj. Lub hardness ntawm fireproof iav yog 6 ~ 12 npaug ntawm ntab iav thiab 2 ~ 3 npaug ntawm tempered iav.

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30 feeb hluav taws iav,hluav taws kub nkag qhov rooj nrog iav,puv iav hluav taws nyob qhov rooj,20 feeb ntsuas iav,hluav taws kub ntsuas iav ob lub qhov rooj,30 feeb hluav taws iav,coj mus muag hluav taws nyob qhov rooj nrog iav,hluav taws kub nkag qhov rooj nrog iav,hluav taws kub ntsuas iav sab hauv qhov rooj,20 feeb ntsuas iav,firelite iav qhov rooj,hluav taws kub nkag qhov rooj nrog iav,hluav taws kub tsis siv neeg zawv zawg iav qhov rooj,30 feeb hluav taws iav,hluav taws kub ntsuas qhov rooj nrog iav qhov rais,20 feeb ntsuas iav