ferrous dust

It began driving ferrous dust against him, borne from somewhere else.

It is a means by which surface contaminants such as Scale or Ferrous Dust Shot and Weld Discolouration are removed.

The AVR754E features a specially engineered double panel system, providing a sealed enclosure for the impulse drive electronics to keep out water and ferrous dust, a particular problem in underground rail applications.

One problem with this system is that the necessary air gap between the target wheel and the sensor allows ferrous dust from the vehicle's underframe to build up on the probe or target, inhibiting its function.