| http://www.w3.org/ns/prov#value | - That is, where heat treatment is to be performed at temperatures of 550??? to 1000??? C., it takes a long period of time, e.g. approximately 40 to 80 minutes for raising the temperature for example to 800??? C. In such cases, the time period for which the substrate stands at temperatures of 400??? to 500??? C. is as long as for example 10 to 20 minutes.
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