Description

Methyl 3-(Trimethoxysilyl)Propyl Methylphosphonate CAS NO 67812-17-3 is a specialized organosilicon phosphonate coupling agent that combines the hydrolyzable reactivity of a silane with the chelating and adhesion-promoting properties of a phosphonate. This unique dual-functionality makes it a critical component for enhancing the interfacial bonding between inorganic substrates and organic polymer matrices. It is primarily sought by formulators and material scientists in the coatings, adhesives, and advanced composites industries to improve durability, corrosion resistance, and mechanical performance.

Application

• As a surface modifier and coupling agent for glass, metal, and mineral fillers in polymer composites.
• To enhance the adhesion and corrosion resistance of primers, paints, and protective coatings on metallic surfaces, particularly aluminum and steel.
• As a key ingredient in adhesive and sealant formulations to improve bonding to difficult substrates.
• In the production of fiber-reinforced plastics (FRP) to optimize the fiber-matrix interface for superior mechanical strength.
• For the surface treatment of pigments and nanoparticles to improve their dispersion and compatibility in various media.
• As a potential flame-retardant synergist in specific polymer systems due to its phosphorus content.

Basic Information

Product Name	Methyl 3-(Trimethoxysilyl)Propyl Methylphosphonate
CAS No.	67812-17-3
Molecular Formula	C8H21O6PSi
Molecular Weight	272.30 g/mol
Synonyms	3-(Trimethoxysilyl)propyl methyl methylphosphonate; Methyl (3-trimethoxysilylpropyl) methylphosphonate; Methylphosphonic acid, P-methyl-, 3-(trimethoxysilyl)propyl ester; Methyl P-methyl-P-(3-trimethoxysilylpropyl)phosphonate; Silaplane S 210; Silane coupling agent SCA 210; Phosphonate silane; (3-Trimethoxysilylpropyl)methyl methylphosphonate
EINECS	Contact for details

Quality Control

Our production of Methyl 3-(Trimethoxysilyl)Propyl Methylphosphonate adheres to stringent quality management protocols. Each batch undergoes rigorous analytical testing, including assay by NMR or titration and impurity profiling, to ensure consistency and high performance. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and key physical properties is provided with every shipment to support your quality assurance and R&D processes.

Storage

Preserve in a tightly closed container, protected from light. This material is hygroscopic (moisture-sensitive). Store in a cool, dry, and well-ventilated area at room temperature (15-25°C/59-77°F). Keep the container tightly sealed under an inert atmosphere (e.g., nitrogen or argon) to prevent degradation from moisture absorption. Keep away from heat and incompatible materials.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (NMR)	≥ 95.0%
Density (20°C)	~1.15 g/cm³
Refractive Index (n20D)	~1.430

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.