1. In addition to the silicone polymers described above, the majority of silicone elastomers incorporate “filler.”
2. Besides acting as a material extender, as the name implies, filler acts to reinforce the cross-linked matrix.
3. The strength of silicone polymers without filler is generally unsatisfactory for most applications (Noll, 1968).
4. Like most other noncrystallizing synthetic elastomers, the addition of
reinforcing fillers reduces silicone’s stickiness, increases its hardness and enhances its mechanical strength.
5. Fillers might also be employed to affect other properties; for example, carbon
black is added for electrical conductivity, titanium dioxide improves the dielectric constant, and barium sulfate increases radiopacity.
6. These and other materials are used to pigment the otherwise colorless elastomer; however, care must be taken to select only pigments suitable for the processing temperatures and end-use application.
1. In addition to the silicone polymers described above, the majority of silicone elastomers incorporate “filler.” 2. Besides acting as a material extender, as the name implies, filler acts to reinforce the cross-linked matrix.3. The strength of silicone polymers without filler is generally unsatisfactory for most applications (Noll, 1968). 4. Like most other noncrystallizing synthetic elastomers, the addition ofreinforcing fillers reduces silicone’s stickiness, increases its hardness and enhances its mechanical strength.5. Fillers might also be employed to affect other properties; for example, carbonblack is added for electrical conductivity, titanium dioxide improves the dielectric constant, and barium sulfate increases radiopacity.6. These and other materials are used to pigment the otherwise colorless elastomer; however, care must be taken to select only pigments suitable for the processing temperatures and end-use application.
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