Phenyl Functional Silicone Fluids

Phenylsiloxanes are a broad category of silicone fluids that contain phenyl groups substituted for methyl groups in the siloxane backbone. High phenyl content increases rigidity in the siloxane backbone, and so high-phenyl content silicones tend to be more viscous or even solid. Other parameters, like refractive index, surface tension, and the dielectric constant also increases with phenyl content.