Polysiloxane (Condensation-type) very high viscosity C-silicone with snap set and A-silicone qualities Very stable material - pour models up to 7 days after impression taking Adjust working time between 1 and 2 mins by over or under dosing Neutral taste & no odour. Biocompatible Speedex Putty Polysiloxane (Condensation-type) Very high viscosity The setting time of Speedex may be accelerated simply by adding more activator 910ml