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The critical values of a or et of a refractory material greatly increase when the limiting deformation is respectively greater than orless than 1 9 10 -4.The critical temperature difference of appearance of cracks in refractories for which a is greater or less than the critical value is effectively increased by increasing the e or reducing the a of the material, respectively.If the strength of a refractory is greater or less than the critical value, its resistance to crack propagation is conveniently increased by reducing the ~ or the et of the material, respectively.

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No abstract