| http://www.w3.org/ns/prov#value | - Both the end products from a) and also those from b) are dried at temperatures of from 50 to 150??? C., preferably at 100 to 140??? C. and, where appropriate, subsequently heat-treated, e.g. over a period of 2 hours, at relatively high temperature, i.e. generally 200 to 400??? C., in particular at 200 to 220??? C.
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