Itela yamalahle ihlelwa ngokweendidi ezintathu: itela yamalahle enobushushu obuphantsi, ubushushu obuphakathi itela yamalahle, kunye netha yamalahle enobushushu obuphezulu.
Itela yamalahle inoxinzelelo oluguquguqukayo phakathi 1.17 kwaye 1.19 iigram cubic centimitha nganye, ukuguqulela malunga 1.17 ukuya 1.19 iitoni nganye cubic meter.
Ngokumataniswa, Ubuninzi be-biotar buhlala bujikeleze 1.2 iigram cubic centimitha nganye, ehambelana ne 1.2 iitoni nganye cubic meter.