Anomet 40 is a standard platinized anode material, which is 40% niobium by crossectional area with a copper core. The use of Anomet 40 is recommended for anode diameters below 1/8". The heavier niobium allows for sufficient mechanical and electrochemical protection of the copper core at these smaller diameters. Anomet 40 is sold principally at smaller diameters usually in double platinum thicknesses. It should be noted that anode life is not related to niobium thickness.
| Anomet 40 (40% Nb) | ||||
| Diameter | Nb Thickness | Resistance | Pt Thickness | |
| inches | inches | microhm/ft | u-in. | (2X)* |
| 0.375 | 0.038 | 113 | 150 | -300 |
| 0.25 | 0.025 | 256 | 100 | -200 |
| 0.188 | 0.019 | 453 | 75 | -150 |
| 0.125 | 0.013 | 1025 | 50 | -100 |
| 0.093 | 0.01 | 1822 | 38 | -75 |
| 0.063 | 0.007 | 4102 | 25 | -50 |
| 0.031 | 0.0035 | 16408 | 12.5 | -25 |
*Double Platinum Thickness