| 摘要 |
PROBLEM TO BE SOLVED: To provide an individual quality evaluation method for product capable of simply and accurately evaluating the quality of a tubular refractory material with significant difference. SOLUTION: A cylindrical test piece 8 is cut from the tubular refractory material and a seal members 9 are arranged and closely adhered to both end open parts of the cylindrical test piece 8 to hermetically close the inner hole 8a of the cylindrical test piece 8, while a gas is supplied to the inner hole 8a to raise the pressure in the inner hole 8a to predetermined pressure. The air passing amount of the cylindrical test piece 8 is measured under the predetermined pressure, and the quality of the tubular refractory material is evaluated, on the basis of the measured air passing amount. COPYRIGHT: (C)2008,JPO&INPIT
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