ELASTOMERIC / SILICONE MATERIAL¤ Used for secondary impression generally¤ Primary impression for knife-edge ridge cases only¤ Setting reaction is by polymerization type of setting reaction herePOLYSULFIDE- Hydrophobic- Catalyst – lead, therefore bad taste, least patient acceptance – disadvantage- Most biocompatible material due to the sulfide content- By-products after polymerization – water, which is a large molecule, thus not the best impression material- Can do electroplating – advantage- Used in cases with deep undercuts- rubbery consistency- It has the consistency of thycol rubber, - high tear strength- Not expensive – advantage- Must pour the cast within 30 mins- Not compatible with epoxy resin

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