| 摘要 |
PROBLEM TO BE SOLVED: To perform a test under multiple temperature conditions for determining the optimum temperature condition of a glass material in a short time. SOLUTION: In this method, a refractory-made plate 1 is placed in a heating furnace having a temperature gradient formed therein, a heat resisting plate 2 is put on the plate 1, and a glass samples 3 to be confirmed for fluidity is arranged in a position corresponding to each section of the plate 1 on the plate 2 followed by heating and cooling, whereby the fluidity of the glass material at a plurality of temperatures can be confirmed in a short time.
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