Is cineál miotail throma neamhfheiriúil é an t-ingot antamóin, soladach airgid bán briosc agus lonrach. Tá dhá allotróp ann, tá an cineál buí cobhsaí ag lúide 90 céim, agus is é an cineál miotail an fhoirm chobhsaí d'antamóin.
Pointe leá 630 ℃, dlús 6.62g/cm3, drochsheoladh teasa.
Glanmheáchan gach tinne: 22 ± 3kg, toise: 21 × 21 Bun: 17 × 17 Airde: 9 cm, pacáilte i gcásanna adhmaid, le glanmheáchan de 1000 ± 50 kg in aghaidh an cháis;
| Grád | Ábhar neamhíonachta≤ |
| As | Fe | S | Cu | Se | Pb | Bi | Cd | Iomlán |
| Sb99.90 | 0.010 | 0.015 | 0.040 | 0.0050 | 0.0010 | 0.010 | 0.0010 | 0.0005 | 0.10 |
| Sb99.70 | 0.050 | 0.020 | 0.040 | 0.010 | 0.0030 | 0.150 | 0.0030 | 0.0010 | 0.30 |
| Sb99.65 | 0.100 | 0.030 | 0.060 | 0.050 | — | 0.300 | — | — | 0.35 |
| Sb99.50 | 0.150 | 0.050 | 0.080 | 0.080 | — | — | — | — | 0.50 |