| Term | polysulfide |
| Pronunciation | pah-lee-SUL-fiyd |
| Variations | rubber base, mercaptan |
| See also | polyether, polyvinylsiloxane, hydrocolloid |
| Definition | 1. A sulfide containing two or more atoms of sulfur per molecule. 2. An elastomeric impression material with a polysulfide base and a lead-sulphur activator that forms rubber on polymerization. Advantages of polysulfide impression materials are low cost, long working time, and high strength, flexibility and accuracy. Disadvantages are low dimensional stability (requiring custom trays), bad odor and long setting time. |
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