Capillary

A guide for a wire comprising an elongated member having an opening therein, and consisting essentially of a metal carbide dispersed throughout a metal matrix of ruthenium or alloy of ruthenium and additional metal, said ruthenium being present in an amount from about 5 to about 15 percent of the total weight of said refractory body, and said additional metal being present in an amount less than about 20 percent by weight based on the weight percent of ruthenium present, wherein said matrix is present in an amount sufficient to impart acid resistant properties to said refractory body.