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Excellent thermal stability up to 250 °C in inert atmospheres.
Superior oxidative resistance compared to standard methyl silicone oils.
Low volatility and high flash point for enhanced process safety.
Good compatibility with organic polymers, resins, and fillers.
Clear, colorless to pale yellow liquid with low pour point (–50 °C).
High-temperature heat transfer fluids in industrial circulation systems.
Base oil for specialty lubricants used in aerospace and automotive components.
Release agent for composite molding and high-temperature elastomer processing.
Dielectric fluid in precision electronic potting and encapsulation formulations.
Viscosity modifier and functional additive in high-performance greases.
| Chemical Type | Phenylmethyl polysiloxane |
| Product Form | Liquid |
| Appearance | Clear, colorless to pale yellow liquid |
| Viscosity at 25 °C (cSt) | 200 ± 20 |
| Density at 25 °C (g/cm³) | 1.03–1.07 |
| Flash Point (COC, °C) | ≥ 300 |
| Pour Point (°C) | ≤ –50 |
| Refractive Index (25 °C) | 1.495–1.505 |
Q1: What distinguishes 9-200 Phenylmethyl Silicone Oil from standard dimethyl silicone oils?
A: The phenyl groups in its molecular structure significantly enhance thermal stability, UV resistance, and compatibility with aromatic solvents and resins—making it especially suitable for high-performance coatings, optical applications, and demanding elastomer formulations where conventional dimethyl silicones may degrade or phase-separate.
Q2: Is 9-200 compatible with common industrial polymers and additives?
A: Yes—it demonstrates broad compatibility with acrylics, polyurethanes, epoxies, and many organic pigments and rheology modifiers. However, due to its phenyl content, compatibility with highly polar or ionic systems should be verified empirically in the final formulation.
Q3: How is 9-200 typically incorporated into formulations?
A: It is generally added during the late-stage mixing phase to minimize shear degradation and ensure uniform dispersion. Dosage depends on formulation requirements but typically ranges from 0.1% to 2% by weight for surface modification, release enhancement, or viscosity control.
Q4: Can 9-200 be used in applications requiring low volatility and long-term stability?
A: Yes—its high molecular weight and phenyl substitution confer very low volatility and excellent resistance to thermal oxidation and aging, supporting extended service life in lubricants, heat-transfer fluids, and encapsulation media operating across wide temperature ranges.
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