Coltene - Speedex Putty 910mL. Speedex Putty is a silicone-based impression material with a setting time of 3 minutes. Speedex Putty is indicated for primary impressions in the putty-wash impression technique, tray material for the simultaneous mixing technique, tray material for the copperband impression technique, and impressions for study models, orthdontic models, matrices, and protective insulation of teeth during flasking of the denture.