Motsoako o ka sehloohong oa lik'hemik'hale oa lifaha tse phaphametseng ke oxide ea silicon le aluminium, moo litaba tsa silicon dioxide li ka bang 50-65%, 'me litaba tsa aluminium oxide li ka bang 25-35%.Hobane sebaka se qhibilihang sa silica se ka holimo ho 1725 ℃ mme sa alumina ke 2050 ℃, kaofela ke lisebelisoa tse phahameng tse hanyetsang.Ka hona, lifaha tse phaphametseng li na le boits'oaro bo phahameng haholo, hangata bo fihla ho 1600-1700 ℃, e leng se etsang hore e be li-refractories tse sebetsang hantle haholo.Boima bo bobebe, insulation ea mocheso.Lerako la lifaha le phaphametseng le tšesaane ebile le sekoti, sekoti ke semi vacuum, ke khase e nyane haholo (N2, H2 le CO2, joalo-joalo), 'me mocheso oa mocheso o lieha haholo ebile o nyane haholo.Ka hona, lifaha tse phaphametseng ha li bobebe feela ka boima ba 'mele (boima ba boima ba 250-450 kg / m3), empa hape li ntle haholo ka ho kenngoa ha mocheso (mocheso oa mocheso oa 0.08-0.1 mocheso oa kamore), o behang motheo oa ho phetha karolo ea bohlokoa. tšimong ea lisebelisoa tse khanyang tsa mocheso oa mocheso.

Boima bo phahameng le matla.Hobane sefaha se phaphametseng ke 'mele o thata oa khalase o entsoeng ke silica alumina mineral phase (quartz le mullite), boima ba eona bo ka fihla ho Mohs 6-7, matla a khatello ea static a ka fihla ho 70-140mpa,' me boima ba 'nete ke 2.10-2.20g / cm3 , e lekanang le lefika.Ka hona, lifaha tse phaphametseng li na le matla a phahameng.Ka kakaretso, lisebelisoa tse bobebe tse bobebe kapa tse se nang letho joalo ka perlite, lejoe le belang, diatomite, sepiolite le vermiculite e atolositsoeng li na le bothata bo fokolang le matla.Lihlahisoa tsa ho kenya mocheso kapa lihlahisoa tse bobebe tse entsoeng ka tsona li na le bothata ba matla a fokolang.Mefokolo ea bona ke matla a lifaha tse phaphametseng, kahoo lifaha tse phaphametseng li na le melemo e mengata ea tlholisano le ts'ebeliso e pharalletseng.Boholo ba likaroloana bo botle 'me sebaka se itseng sa holimo se seholo.Boholo ba tlhaho ba lifaha tse phaphametseng ke 1-250 μ M. Sebaka se khethehileng sa holimo ke 300-360cm2 / g, se tšoanang le sa samente.Ka hona, lifaha tse phaphametseng li ka sebelisoa ka ho toba ntle le ho sila.

Bokhabane bo ka finyella litlhoko tsa lihlahisoa tse fapa-fapaneng, lisebelisoa tse ling tse bobebe tsa mocheso oa mocheso hangata li na le boholo bo boholo ba likaroloana (tse kang perlite, joalo-joalo), haeba ho sila ho tla eketsa matla haholo, e le hore mocheso oa mocheso o fokotsehe haholo.Tabeng ena, lifaha tse phaphametseng li na le melemo.Motlakase o motle ka ho fetisisa.Lifaha tse phaphametseng ke lisebelisoa tse ntle haholo tsa insulate 'me ha li na conductive.Ka kakaretso, ho hanyetsa ha insulator ho fokotseha ka ho eketseha ha mocheso, empa ho hanyetsa ha sefaha se phaphametseng ho eketseha ka ho eketseha ha mocheso.Molemo ona ha o na lisebelisoa tse ling tsa insulating.Ka hona, e ka etsa lihlahisoa tsa ho itšireletsa tlas'a maemo a phahameng a mocheso.