Njerwa yopindika yopingasa ili ndi Al2O3 pafupifupi 30% ~ 45%, ndipo kuchuluka kwa silika kuli kotsika kuposa 78%. Njerwa zopindika zopingasa zili m'gulu la zinthu zofooka zopingasa za asidi. Chotchinga chopindika chopingasa chimalimbana ndi asidi wouma komanso kuwonongeka kwa mpweya wa asidi, koma mphamvu yolimbana ndi alkali ndi yofooka pang'ono. Mabuloko opindika opingasa ali ndi mawonekedwe abwino a kutentha komanso kukana kutentha kwambiri.
| Njerwa Yokhotakhota | |||
| Mndandanda | Njerwa ya Alumina ya 40 - 45% | Njerwa ya Alumina ya 30 - 35% | |
| Chinthu | Chigawo | 1600°C | 1500°C |
| Kuchuluka Kwambiri | g/cm³ | 2.2 | 2.1 |
| Kuoneka ngati Porosity | % | 22 | 24 |
| Modulus of Rupture | kg/cm² | 90 | 80 |
| Mphamvu Yopondereza Yozizira | kg/cm² | 300 | 250 |
| Kukula kwa Mizere 1350°C | % | 0.2 | 0.2 |
| Kusakhazikika kwa Refractoriness Mu katundu | °C | 1450 | 1300 |
Njerwa yokhotakhota imagwiritsidwa ntchito makamaka popangira zinthu zotetezera kutentha kapena zinthu zina zotetezera kutentha, monga zinthu zotetezera kutentha monga ziwiya za ethylene pyrolysis, ziwiya za tubular, ziwiya zosinthira za ammonia yopangidwa, majenereta a gasi ndi ziwiya za shullte zotentha kwambiri, ndi zina zotero.