Floating hlaws yog ya tshauv hollow npas uas tuaj yeem ntab saum npoo dej.Lawv yog grey-dawb, nyias thiab hollow, thiab lub teeb nyob rau hauv hnyav.Qhov ntau qhov ntom yog 720kg / m3 (hnyav), 418.8kg / m3 (lub teeb), thiab qhov loj me yog li 0.1 hli, qhov chaw kaw thiab du, thermal conductivity yog me me, thiab cov refractoriness yog ≥1610 ℃.Cov tshuaj muaj pes tsawg leeg ntawm cov hlaws ntab ntab yog feem ntau silicon dioxide thiab aluminium oxide.Nws muaj ntau yam zoo xws li cov khoom zoo, hollow, lub teeb yuag, siab zog, hnav tsis kam, kub tsis kam, thermal rwb thaiv tsev, rwb thaiv tsev thiab nplaim taws.Nws yog dav siv nyob rau hauv Ib qho ntawm cov khoom siv raw rau kev lag luam refractory.