Society of Glass Technology · [Sheffield] · leaf 121
-ment fairly readily; the second is also workable with a hot furnace.The third was very stiff, and would require a tank furnace work-ing at a higher temperature than usual. 4. Soda.—Practical experience shows that increasing the pro-portion of soda (alkali) softens a glass. Actual measurements… … 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 IS 16 Time in minutes. one end have been carried out, and Fig. 3 illustrates the relation-ship obtained between workability and proportion of soda atdifferent temperatures.* The three curves in Fig. 3 show the effect of increasing the per-centage of soda on the…
Glass
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