POLYSULFIDE ELASTOMERIC IMPRESSION MATERIAL:
First elastomeric impression material to be introduced, also known as mercaptan / thymol, it is a type of Rubber based impression material
Supplied as

Base paste (white)
Accelerator (brown/grey)

Available in 3 viscosities:

Light bodied
Medium bodied
Heavy bodied

Composition:
Base paste:

Liquid polysulfide polymer                                         80-85%
Inert fillers (titanium oxide, zinc sulfate, silica)         16-18%

Reactor Paste:

Lead dioxide                                                               60-69%
Dibutyl [...]