Crosslinkers & Modifiers
Phenyltrimethoxysilane | Manta P31
Manta P31 is phenyltrimethoxysilane (CAS 2996-92-1), a phenyl-functional silane used as a hydrophobic surface modifier for inorganic fillers and as an intermediate for phenyl-silicone resins. Its phenyl group provides thermal stability for materials processed at elevated temperatures, with further uses in sol-gel hard coats, epoxy molding compounds and optical materials.
- Grade
- P31
- Chemical Name
- Phenyltrimethoxysilane
- CAS No.
- 2996-92-1
- EINECS
- 221-066-9
- Formula
- C9H14O3Si
- Form
- Colorless Transparent Liquid
Overview
Manta P31 is a phenyl-functional trimethoxysilane that acts as a surface modifier, crosslinker and chemical intermediate. The phenyl-silicon bond is significantly more stable than alkyl-silicon bonds, which suits materials processed or used at elevated temperatures.
P31 renders inorganic surfaces hydrophobic and improves the compatibility of fillers in organic polymer matrices, which reduces melt viscosity and improves loading levels in mineral-filled polymers. It is also a building block for phenyl-silicone resins, and its phenyl content allows formulators to tune the refractive index of optical resins and coatings.
Manta PD21 carries two phenyl groups and two methoxy groups, and offers higher thermal and oxidative stability and a higher refractive index than P31. P31, with one phenyl and three methoxy groups, is used for filler treatment and for co-hydrolysis with alkyl or epoxy silanes in sol-gel coatings.
Key Features
- Phenyl-silicon bond more stable than alkyl-silicon bonds
- Long-term performance at elevated temperatures
- Phenyl content for refractive index control in optical resins and coatings
- Hydrophobic treatment of inorganic fillers with reduced melt viscosity
- Improved loading levels in mineral-filled polymers
- Suited to co-hydrolysis with other silanes for hybrid hard coats
- Releases methanol on hydrolysis
Cross-Reference
Manta P31 can be considered as an alternative to Momentive Silquest A-153, Evonik Dynasylan 9165 and Shin-Etsu KBM-103.
Trademarks are the property of their respective owners; no affiliation is implied.
Specifications
| Property | Typical Value |
|---|---|
| Appearance | Colorless Transparent Liquid |
| Density (ρ20°C, g/cm³) | 1.0620±0.0050 |
| Refractive Index (n25/D) | 1.4650–1.4750 |
| Purity (by GC, %) | 98.0 min |
Typical values from the current Technical Data Sheet.
Applications
- Inorganic filler treatment: wollastonite, aluminum trihydroxide (ATH), silica and kaolin, improving dispersibility and lowering viscosity in mineral-filled polymer melts, especially high-temperature processed engineering plastics
- High-temperature resins and siloxanes: intermediate for phenyl-silicone resins, and modifier of silicone oils and resins for better resistance to oxidation and thermal degradation in aerospace and industrial applications
- Sol-gel coatings and hard coats: co-hydrolyzed with alkyl or epoxy silanes to produce hybrid organic-inorganic coatings with good hardness, thermal stability and weather resistance for decorative and protective finishes
- Electronics and semiconductor packaging: additive in epoxy molding compounds (EMC) and other electronic encapsulants, improving adhesion between the resin and silica filler while maintaining thermal stability during lead-free soldering
- Optical materials: raises the refractive index of transparent polymers and optical coatings such as LED encapsulants, lens coatings and optical fibers
- Hydrophobic additive: added to other silane coupling agent systems to enhance the water repellency of glass, masonry and ceramic surfaces
Related applications: Paints & Coatings · Plastics & Masterbatches
Packaging & Storage
Supplied in 25 kg pail, 200 kg drum and 1000 kg IBC.
Safety and Storage
Keep away from heat and open flame. When stored at or below 25 °C in the original unopened containers, this product has a usable life of 24 months from the date of production.
Documents
- Technical Data Sheet · PDF Download TDS
- SDS and COA · on request Request Documents
Frequently Asked Questions
Which inorganic fillers can Manta P31 treat, and what does the treatment achieve?
Manta P31 is used on wollastonite, aluminum trihydroxide (ATH), silica and kaolin. It renders these fillers hydrophobic, improving their dispersibility and lowering melt viscosity in mineral-filled polymers, particularly engineering plastics processed at high temperatures.
Why is a phenyl silane preferred over alkyl silanes for high-temperature service?
The phenyl-silicon bond in Manta P31 is significantly more stable than alkyl-silicon bonds, providing long-term performance at temperatures exceeding 250°C-300°C. This suits epoxy molding compounds that must withstand lead-free soldering and phenyl-silicone resins for aerospace and industrial use.
Can Manta P31 be co-hydrolyzed with other silanes in sol-gel coatings?
Yes. Manta P31 is often co-hydrolyzed with alkyl or epoxy silanes to produce hybrid organic-inorganic hard coatings with good hardness, thermal stability and weather resistance for decorative and protective finishes.
Related Products
P31 is one step in the sealant and adhesive formulation chain. One inquiry can cover the other raw materials in your formulation, with samples, technical documents, quotation and shipment handled together.
Looking for a different purity, functional group, or a structure not listed here? Contact our technical team.
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