The kaolin is not fusible, the petuntze vitrifies and envelopes the kaolin, producing a smooth compact body which is translucent.
Chats on Oriental China|J. F. Blacker
Slender, brilliant, colourless needles; fusible at 122 Fahr., and distilling at a higher temperature without decomposition.
Cooley's Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades..., Sixth Edition, Volume I|Arnold Cooley
All the fusible plugs were in cartridges to prevent sparks from falling if the plugs burned out.
Chicago's Awful Theater Horror|Various
There was a safety valve, a glass water gauge, a pressure gauge, and two fusible plugs upon the tube.
Records of Steam Boiler Explosions|Edward Bindon Marten
It is not only infusible by itself, but it will not dissolve in the fusible glasses; making them merely opaque.
A Dictionary of Arts, Manufactures and Mines|Andrew Ure