YB/T 5205-1993 Test method for linear thermal expansion of dense refractory castables was changed to GB/T 7320.1-2000 Refractory materials-Determination of thermal expansion (Push rod method).
YB/T 5205-1993 Test method for linear thermal expansion of dense refractory castables was changed to GB/T 7320.2-2000 Refractory materials-Determination of thermal expansion(Telescope method).
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