An interference signal avoiding device of a frequency hopping spread system and a method thereof are disclosed. Molybdenum metal powder includes molybdenum metal particles having a surface-area-to-mass ratio of between about 1 m2g and about 4 m2g, as determined by BET analysis, and a flowability of between about 29 s50 g and 86 s50 g as determined by a Hall Flowmeter. Compositions for use in the method can be prepared as concentrates, and used full strength or in diluted form. In an alternative embodiment, the silicon oxide layer overlying the portion of the substrate is removed with the metal layer abutting the silicon layer. Upon determining that the IP address is no longer allocated to the user by the access network, the node terminates the IMS communication service.