41. Mining and non ferrous metal issues were also strong, following gold prices higher, traders said. 42. Non-ferrous metal producers and brokerage house stocks also gained. 43. He became a laboratory technician working with non-ferrous metals . 44. Zinc improves wetting of ferrous metals , indium as well. 45. As ferrous metals cool from a melt, they record the magnetic dominance of that moment. 46. Wherever possible, all hardware is plastic or non-ferrous metal . 47. Non-ferrous metal producers were among leading gainers, rising 1 . 82 percent as a group. 48. There was a 2 . 8-percent decline in non-ferrous metal prices from the previous month. 49. Despite the favorable tribological properties of DLC it must be used with caution on ferrous metals . 50. MRIs ) generate enormous magnetic fields, and therefore rooms intended to hold them exclude ferrous metals .