This invention relates to a high temperature melting composition and a method of using the composition for brazing high temperature niobium-based substrates, such as niobium-based refractory metal-intermetallic compositions, including but not restricted to niobium-silicide composite alloys. The peripheral edge is comprised of a series of outer surfaces positioned at or beyond a first radial distance from a center point of the valve, and may be in the form of tabs, and an alternating series of inner surfaces positioned at or within a second radial distance from the valve or flange center point, as intervening portions. In particular, the refill container is provided with a coil terminated by one of a number of capacitors.