Express STD Putty is a vinyl polysiloxane impression material indicated for use in crown, bridge, inlay, onlay, denture and partial denture impressions.Express STD Putty is a vinyl polysiloxane impression material indicated for use in crown, bridge, inlay, onlay, denture and partial denture impressions. • Mixes easily without streaking • Good dimensional stability • Excellent elastic recovery • Provides a firm set • 1 min working time • 5 min setting time