Fibrous glass manufacture using refractory bushing

In a process for producing glass fibers comprising:

• electrically heating a bushing so as to maintain a pool of molten glass therein, and attenuating a glass stream issuing from said bushing into a glass fiber, the improvement wherein said bushing is fabricated of chromic oxide which has been doped with a sufficient amount of a dopant to increase its electrical conductivity said dopant is a compound having a cationic moiety with a valence of 1 or 2 and an ionic radius which is within about 15% of the ionic radius of chromium and an anionic moiety selected from the group consisting of oxides, halides, sulphates, carbonates and nitrates.