Some Experiments on the Substitution of Potash in an Alkali-Lead Oxide-Silica Glass for Electric Lamp Purposes

JSGT 1941 V25 T150-T158

 The experimental work involved before a change in the composition of a well-established commercial glass can be made with reasonable chance of success is described and illustrated by reference to a lead-oxide glass to meet war-time conditions. In this connection strontium oxide has proved to be a useful glass-making material, and the properties of glasses containing up to 6 per cent SrO are described. Glasses containing more soda but substantially less potash than the parent glass can be made as resistant electrically by an addition of small proportions of lime and strontia. Such glasses are less viscous than normal “soft” lead oxide glass at temperatures exceeding 800°, with consequent advantages in founding and working. They are also not so corrosive as similar glasses containing barium instead of strontium oxide.

 J. H. Partridge, B.Sc., Ph.D.