Society of Glass Technology · [Sheffield] · leaf 119
he curve between1050° and 1200° indicates a very rapid diminution in the viscosity.That is to say, the working range for a high lime-containing glassis small. Within a range of about 150°, the metal on the onehand may be too stiff, on the other too soft to be worked. 2. Magnesia.—This constituent… … 1200 1250 1300 1350Temperature. 1400 1450 1500 represents the viscosity of a glass f (or slag) having the percentagecomposition Si02 52, CaO 48. In curve (6) the viscosity is thatof a glass (or slag) with SiOg 52, CaO 28, MgO 20. It will be noted that at any temperature between 1250° and1300° the…
Glass
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