Ukuminyana kwensimbi engagqwali ngu-7.7 g/cm³. Lapho insimbi engagqwali isetshenziswa ezinqubweni ezahlukene ezimbonini ezihlukahlukene, kunciphisa isikhathi sokulethwa esithathwe izingxenye ezenziwe ngensimbi engagqwali. Lokhu kungenxa yokuthi, ngenxa yokusebenzisa insimbi engagqwali, asikho isidingo sokuqeda ukwenziwa. Insimbi engagqwali ine-ductility ephezulu kanye nezinga eliphezulu lokuqina komsebenzi. Insimbi engagqwali inamandla ashisayo aphakeme kanye nokuqina okuphezulu kwe-cryogenic. Insimbi engagqwali itholakala emabangeni angaphezu kuka-150, kodwa amabanga ayi-15 kuphela asetshenziswa ngokujwayelekile. Into enhle ngempela ngensimbi engagqwali ukuthi ingaphinda igaywe kabusha ngo-100%.