1. Density
Range: 0.95–1.05 g/cm³ (20°C); some literature indicates a range of 0.96–1.02 g/cm³ at specific viscosities.
This low density stems from the hydrophobic structure of the silane backbone, making it lighter than most mineral oils.

2. Viscosity
The adjustable range is extremely wide: 6.5 × 10⁻⁷ to 1 m²/s (0.65–1000 mm²/s), with common industrial products ranging from 10–1000 cSt.
The viscosity varies little with temperature (low viscosity-temperature coefficient), making it suitable for applications in wide temperature environments.

3. Refractive Index
Typical values: 1.400–1.420 (25°C); high-viscosity products may reach 1.438.
This value is lower than that of phenyl silicone oil, making it suitable for lubrication of optical instruments.

Supplementary Properties
Freezing Point: Below -70°C, with some models reaching -110°C.
Flash Point: >265°C (open cup method), approximately 80°C (closed cup method).

Note: Data differences are due to different synthesis processes (e.g., molecular weight control). The actual selection should be considered based on the specific application scenario.