Sentence Examples


  • As some of these substances (for example, lead sulphide and copper pyrites) are readily fusible when first heated, but become more refractory as part of the sulphur is dissipated and oxygen takes its place, it is important that the heat should be very carefully regulated at first, otherwise the mass may become clotted or fritted together, and the oxidizing effect of the air soon ceases unless the fritted masses be broken small again.
  • The materials used in the construction of furnaces are divisible into two classes, namely, ordinary and refractory or fire-resisting.
  • They give wares of remarkably fine texture and surface, combined with high refractory character.
  • Alumina as a refractory material is chiefly used in the form of bauxite, but its applications are somewhat special.
  • Oxide of chromium and chrome iron ore have been proposed as refractory crucible materials.
 

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