Polyvinyl siloxane (PVS), introduced in the 1970s, is an addition reaction silicone elastomer, used in Dentistry as an impression material.[1]
To create the material, simply mix a blue putty with a white putty (both of roughly play-dough consistency) and the chemical reaction begins, in which case you have approximately 3-5 minutes before the final set. Final set is noted when the product rebounds upon touching with a blunt or sharp instrument.
This reaction also gives off H2 gas and therefore the ensuing cast should wait to be poured at least 5 minutes.
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