OH-82 Hydroxy-terminated polymethylphenylsiloxane
OH-82 Hydroxy-Terminated Polymethylphenylsiloxane is a silicone polymer with hydroxyl groups at both ends. It has excellent heat resistance, oxidation stability, and works well with organic resins and solvents. Used in high-performance industries needing heat stability and solubility.
Features:
OH-82 Hydroxy-Terminated Polymethylphenylsiloxane (CAS NO.:Â 63148-52-7), also known as hydroxyl-terminated polymethylphenyl siloxane fluid, is a specialized silicone polymer with hydroxyl functional groups at both molecular ends. Its molecular backbone consists of dimethylsiloxane and methylphenylsiloxane units, which provide superior thermal stability, oxidative resistance, and compatibility with organic resins and solvents.
This silicone fluid is widely used in high-performance industrial applications, especially where high-temperature stability and enhanced solubility in organic systems are required.
Chemical Identity and Physical Properties
| Property | Specification |
|---|---|
| Product Name | Hydroxy-Terminated Polymethylphenylsiloxane |
| CAS Number | 63148-52-7 |
| Molecular Structure | [–Si(CH₃)₂O–]ₙ[–Si(CH₃)(C₆H₅)O–]ₘ (hydroxyl-terminated) |
| Chemical Family | Phenyl-modified silicone fluid |
| Appearance | Colorless to light yellow transparent viscous liquid |
| Typical Viscosity (@ 25 °C) | 50–1000 cSt (customizable) |
| Density (@ 25 °C) | ~1.06–1.08 g/cm³ |
| Refractive Index (nD @ 20 °C) | ~1.495–1.500 |
| Flash Point (Closed Cup) | > 225 °C |
| Boiling Point | > 250 °C |
| Solubility | Soluble in aromatic and aliphatic hydrocarbons, ketones, esters |
| Water Solubility | Insoluble |
| Storage Conditions | Cool, dry, and sealed environment |
Key Features & Advantages
High thermal resistance: Stable at temperatures up to 250 °C or higher.
Excellent solubility: Good compatibility with organic polymers and resins.
Functional hydroxyl groups: Enables crosslinking or further modification.
Enhanced lubricity: Acts as a high-performance lubricant under extreme conditions.
Electrical insulation: Suitable for use in high-voltage and thermal-insulating applications.
Low volatility: Ideal for long-term use in enclosed systems like diffusion pumps.
Typical Applications
Hydroxy-Terminated Polymethylphenylsiloxane (CAS 63148-52-7) is widely used across a range of industries:
High-temperature lubricants for metal processing and precision instruments
Heat-resistant coatings and release agents for plastics, rubber, and thermosetting resins
Base polymer for RTV (Room Temperature Vulcanizing) silicone rubbers and potting compounds
Defoaming agents in chemical and petrochemical industries
Diffusion pump oils in vacuum systems requiring high thermal stability
Modifier in silicone emulsions and phenyl-silicone formulations
Available Grades
Silico® offer this product in a variety of viscosity grades, including:
Low-viscosity grades: 50 cSt, 100 cSt
Medium-viscosity grades: 200 cSt, 500 cSt
High-viscosity grades: 1000 cSt and above (custom available)
Packaging & Storage
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1 kg bottles for lab and R&D use
-
20 kg pails and 200 kg drums for industrial bulk applications
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1000 kg IBC containers for large-scale production
All technical data provided is based on current knowledge and experience. Users must test product suitability for intended applications.
No warranties are expressed or implied. Silico® assumes no liability for incidental or consequential damages.
Jessica G.
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Hydroxy-Terminated Polydimethylsiloxane (PDMS)
