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What is the ideal temperature for hardening FIMO?

The gelling process (PVC in plasticiser) cannot be completed at temperatures of less than 110° C. FIMO will harden, but is still brittle inside and therefore fragile. If you harden FIMO at temperatures above 110° C, it will become more flexible.
 
However, you then accept that the colours become more brownish and are possibly about to burn. We do not recommend doing this!
 
The ideal hardening temperature is 110° C for 30 minutes.